work, energy, and power energy, work, and power
DESCRIPTION
Energy, Work, and Power Principles of EngineeringTM Unit 1 – Lesson 1.2 – Work, Energy, and Power Work Work (symbol W) is the energy transferred when a force F is applied to an object moving through a distance d. W = F ∥ ⋅ d Work is only done by F ∥ , the component of force parallel to the distance the object moves. Note: Vectors and scalars are introduced in Unit 2. Depending on your students, you may wish to connect to that content here. Force and displacement are vectors. Energy and work are scalars. In this formula, work is the scalar product, a.k.a. the dot product, of these two vectors. The scalar product multiplies the magnitude of the vector components that are parallel to each other. The SI unit of work or energy is the joule (symbol J). 1 J = 1 N·mTRANSCRIPT
Work Energy and Power
WorkWork (symbol W) is the energy transferred when a force F is applied to an object moving through a distance d
bull The SI unit of work or energy is the joule (symbol J)
bull Work is only done by the component of force parallel to the distance the object moves
1 J = 1 Nm
W = F∥ sdot d
A student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
Work Example
W = F ∙ d= 500 lb ∙ 400 ft= 200 ft ∙ lb
This is an amount of work But it is not in the SI unit of joules
Convert to SI units and then calculate work
Work ExampleA student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
500 lb ∙ 1 N0225 lb = 2225 N
400 ft ∙ 1 m328 ft = 122 m
EnergyAbility to do workLight heat mechanical chemical and electrical
forms of energy can all be used to exert a force for a distance
NASA solar sail Fuel cellRoller coaster
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
WorkWork (symbol W) is the energy transferred when a force F is applied to an object moving through a distance d
bull The SI unit of work or energy is the joule (symbol J)
bull Work is only done by the component of force parallel to the distance the object moves
1 J = 1 Nm
W = F∥ sdot d
A student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
Work Example
W = F ∙ d= 500 lb ∙ 400 ft= 200 ft ∙ lb
This is an amount of work But it is not in the SI unit of joules
Convert to SI units and then calculate work
Work ExampleA student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
500 lb ∙ 1 N0225 lb = 2225 N
400 ft ∙ 1 m328 ft = 122 m
EnergyAbility to do workLight heat mechanical chemical and electrical
forms of energy can all be used to exert a force for a distance
NASA solar sail Fuel cellRoller coaster
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
A student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
Work Example
W = F ∙ d= 500 lb ∙ 400 ft= 200 ft ∙ lb
This is an amount of work But it is not in the SI unit of joules
Convert to SI units and then calculate work
Work ExampleA student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
500 lb ∙ 1 N0225 lb = 2225 N
400 ft ∙ 1 m328 ft = 122 m
EnergyAbility to do workLight heat mechanical chemical and electrical
forms of energy can all be used to exert a force for a distance
NASA solar sail Fuel cellRoller coaster
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Convert to SI units and then calculate work
Work ExampleA student lifts a 500 pound ball 400 feet in 500 seconds How many joules of work did the student complete
500 lb ∙ 1 N0225 lb = 2225 N
400 ft ∙ 1 m328 ft = 122 m
EnergyAbility to do workLight heat mechanical chemical and electrical
forms of energy can all be used to exert a force for a distance
NASA solar sail Fuel cellRoller coaster
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
EnergyAbility to do workLight heat mechanical chemical and electrical
forms of energy can all be used to exert a force for a distance
NASA solar sail Fuel cellRoller coaster
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Forms of EnergyPotential Energy (Stored energy often referring to gravitational
potential energy)
The capacity to do work by virtue of position or configuration
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Forms of EnergyKinetic Energy (Energy of motion)
Energy which a body possesses because of its motion which occurs anywhere from an atomic level to that of a whole organism
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Energy Transformation
ChemicalKinetic
Radiant Chemical
Electrical Thermal
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Renewable Energy SourcesBiomass Hydropower Geothermal
Wind Solar
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Nonrenewable Energy Sources
Petroleum
Natural GasCoal
Uranium
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Conservation of Energy
Energy cannot be created or destroyed but it can change from one form to another
Energy ldquoLostrdquo to HeatWhen an input energy is changed to an output energy some of the output is usually heat energy
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Energy ConversionExamples of energy conversions for making electricityFossil fuels Chemical rarr Heat rarr Mechanical rarr Electrical
Solar cells Sunlight rarr Electrical
Wind turbines Kinetic rarr Mechanical rarr Electrical
Hydroelectric Gravitational potential rarr Mechanical rarr Electrical
Nuclear Nuclear rarr Heat rarr Mechanical rarr Electrical
Vehicle System ConversionChemical
Mechanical HeatWhich output is desired mechanical or heat
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
EfficiencyEfficiency (symbol h) is the percentage of the input energy Ein that is transformed to the output energy in the desired form Eout
η = EoutE in
Efficiency is usually written as a percentage
120578=EoutE in
∙ 100
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
What Are Current Energy Concerns
Consumption
What roles do engineers have in energy
PollutionDepletionDependencyCost
httpwwweiadoegov
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
PowerPower (syimbol P) is the rate at which energy E is expended or work W is performed in time t
The SI unit for power is the watt (symbol W)
P = Et P = Wtor
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Types of Power
Electrical PowerUses electrical energy to do work
Mechanical PowerUses mechanical energy to do work (linear rotary)
Fluid PowerUses energy transferred by liquids (hydraulic) and gases (pneumatic)
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
Power Example
Work = 271 J (see earlier slide)
A student lifts a 500 pound ball 400 feet in 500 seconds How many watts of power did the student use to lift the ball
P =Wt = 271 J500 s = 543Js
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-
ResourcesMcGraw-Hill dictionary of engineering (2nd ed) New York
NY McGraw-Hill
Microsoft Inc (2008) Clip art Retrieved January 10 2008 from httpofficemicrosoftcomen-usclipartdefaultaspx
National Aeronautics and Space Administration (NASA) (1997) Daedalus Retrieved April 2 2008 from httpwwwdfrcnasagovGallery PhotoDaedalus
US Department of Energy (2008) Scientific forms of energy Retrieved March 23 2008 from httpwwweiadoegovkidsenergyfactsscienceformsofenergyhtml
- Work Energy and Power
- Work
- Work Example
- Work Example (2)
- Energy
- Forms of Energy
- Forms of Energy (2)
- Energy Transformation
- Renewable Energy Sources
- Nonrenewable Energy Sources
- Conservation of Energy
- Energy Conversion
- Efficiency
- What Are Current Energy Concerns
- Power
- Types of Power
- Power Example
- Resources
-