unit 6 section 2 notes. static electricity build-up surface the build-up of an electric charge on...
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CURRENTUnit 6 Section 2 Notes
Static Electricity
The build-up of an electric charge on the surface of an object.
The charge builds up but does not flow.
Static electricity is potential energy. It does not move. It is stored.
Current Electricity
Current: The flow of electrons from one place to another.
Measured in amperes; Abbreviated amps (A)
Current electricity is Kinetic energy
What is an Ampere?
Ampere: a measurement of the current flow rate of electrons.Basically, the larger the size of wire, the
greater the ampere capacity.
Where do your see these plugs?Why are they larger?
Copyright © 2010 Ryan P. Murphy
Answer: The Plug to a dryer or stove is much thicker than a standard outlet to account for extra amps.
Copyright © 2010 Ryan P. Murphy
Answer: The Plug to a dryer or stove is much thicker than a standard outlet to account for extra amps.
Copyright © 2010 Ryan P. Murphy
How can we control currents? With circuits. Circuit: is a path for the
flow of electrons. We use wires.
There are 2 types of currents: Direct Current (DC) – Where
electrons flow in the same direction in a wire.Example: Batteries , Static Electricity,
Lightning
There are 2 types of currents: Alternating Current (AC) – electrons
flow in different directions in a wire; flow is back and forth, changing its direction many times in one second.Example: Plugs and outlets
Advantages of AC Voltage can be raised or lowered. More efficient over long distances.
Rockin Quiz!This is your chance to rock it out in science class so don’t just sit there. At least rock your head or tap your desk etc.After some intro slides, teacher will call on a student to rock it out on their way to the board.Student goes to board and touches the picture that represents AC or DC on the AC/DC logo (If using a screen just point and drum the air).Student will then pick a new student to go to the board as the teacher changes the slide.Thunderstruck video (For the music during quiz and I didn’t see anything inappropriate ).http://www.youtube.com/watch?v=v2AC41dglnM
Note: Many devices such as computers plug into the wall (AC Current) but the AC current is converted into DC Current to run through the machine.For simplicity sake in this activity, if it has a plug we
will call it AC, and if doesn’t (batteries) we will call it DC.
“DC”
“Its one way!”
“AC”
“It Alternates!”
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
Is this (AC) Alternating Current, or (DC) Direct Current?
What is Resistance??? This... ???
What is Resistance?
The opposition to the flow of an electric current, producing heat; caused by internal friction
The greater the resistance, the less current gets through.
Good conductors have low resistance.
Measured in Ohms; Symbol:
The refusal to accept or comply with something; the attempt to prevent something by action or argument.
Resistance
What Influences Resistance? Material of wire – aluminum and
copper have low resistance Thickness – the thicker the wire
the lower the resistance Length – shorter wire has lower
resistance Temperature – lower temperature
has lower resistance
What is Voltage? Volt: A measure of the force or
pressure under which electricity flows. The greater the voltage, the greater
the force or “pressure” that drives the charge through the circuit.
Electricity flows through a wire much like water flows through a pipe.
Electricity flows through a wire much like water flows through a pipe.A force is required to drive it and resistance to is
encountered, the flow of current is measured in amps
Difference between Volts and Amps
Example – you could say that…Amps measure how much
water comes out of a hose.Volts measure how hard the
water comes out of a hose.
What are Watts?
Watt: is a measurement of electrical power created.1 watt is equal to one joule of energy per
second
What are Watts? A Watt is calculated by multiplying
volts times amps. Most household electrical usage is
billed in kilowatt hours, or the amount of hours times 1,000 watts.
• Volts are a measure of the force or pressure under which electricity flows.
• Amps are a measurement of the current flow rate of electrons
• Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance.
• Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.
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• Volts are a measure of the force or pressure under which electricity flows.
• Amps are a measurement of the current flow rate of electrons
• Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance.
• Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
DAnything in an electrical circuit that impedes the flow of current.
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
DAnything in an electrical circuit that impedes the flow of current.
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
Watts
DAnything in an electrical circuit that impedes the flow of current.
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
Watts
DAnything in an electrical circuit that impedes the flow of current.
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
Watts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
Watts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
AmpsWatts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
AmpsWatts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B CThis is a measure of the force or pressure under which electricity flows
Amps VoltsWatts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
Which is the correct description of Watts?
AThis is a measurement of electrical power created.
This is a measurement of the current flow rate of electrons
B C
AmpsVoltsWatts
DAnything in an electrical circuit that impedes the flow of current.
Resistance
This is a measure of the force or pressure under which electricity flows
Volts
Again!
• Volts are a measure of the force or pressure under which electricity flows.
• Amps are a measurement of the current flow rate of electrons
• Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance.
• Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.
Study
for 3
0 S
• Volts are a measure of the force or pressure under which electricity flows.
• Amps are a measurement of the current flow rate of electrons
• Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance.
• Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
Volts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
Volts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
Resistance
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
Resistance
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
VoltsResistance
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
VoltsResistance
This is a measurement of electrical power created.
Which is the correct description of Watts?
AThis is a measurement of the current flow rate of electrons
B C
AmpsVolts
DAnything in an electrical circuit that impedes the flow of current.
This is a measure of the force or pressure under which electricity flows
VoltsResistance
This is a measurement of electrical power created.
Watts
Georg Simon Ohm (1789 –1854) Ohm found that there is a direct proportionality
between voltage applied across a conductor and the resultant electric current.
Learn more at.. http://www.allaboutcircuits.com/vol_1/chpt_2/1.html
Ohms: The measure of resistance in a circuit to the flow of an electric current.The greater the ohm value the more difficult it is for
current to flow through a given circuit. A low ohm value represents a low resistance and
the easy flow of current through a circuit
Current
Ohms: The measure of resistance in a circuit to the flow of an electric current.The greater the ohm value the more difficult it is for
current to flow through a given circuit. A low ohm value represents a low resistance and
the easy flow of current through a circuit.
Ohms Law Simulator at…http://phet.colorado.edu/en/simulation/ohms-law
I
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
V 220 V
R= ------
I
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
V 220 V
R= ------ --------- =
I 36 A
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
V 220
R= ------ --------- = 6.1 ohms
I 36A
If 220 volts travel through a copper wire and the current is 36A, What’s the resistance of the wire?
V 220
R= ------ --------- = 6.1 ohms
I 36A
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R 50,000 ohms
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R 50,000 ohms
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R 50,000 ohms
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R 50,000 ohms
A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance.How much current will he experience?
V 120 V
I = ----- ----------- = .0024A
R 50,000 ohms
Video Link! Current, Voltage, Resistancehttp://www.youtube.com/watch?v=J4Vq-xHqUo8
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