Ohm’s LawOhm’s Law

This presentation is designed to give you the added principles of Ohms’

Law

Learning Objectives- Upon Learning Objectives- Upon completion of this lesson…completion of this lesson…

Students will know the various variables of Ohm’s Law and what they signify

Students will know the relationships of the variable

Students will know how to compute the missing variable given the other two

P=PowerP=Power

Power is the measure of how much work can be done in a given amount of time

Power is measure in “Watts/W”

V=VoltageV=Voltage

Voltage is the amount of work done per unit of charge

Voltage is measured in Joules per CoulombIt is often thought of as the amount of

“energy” being appliedThe unit applied is “Volts/V”

I= CurrentI= Current

Current is the flow of electrical charge through a system

Current is measure in amperes, which is equivalent to 1 coulomb per second

The unit applied is “Amperes/Amps”

Ohm’s LawOhm’s Law

Ohm’s LawOhm’s Law

Solving for “P”Solving for “P”

• Cover “P”• Remaining formula is “V x I”• Meaning as voltage or current increases the

power will increase• Giving power a direct relationship to the

other two variables

Ohm’s LawOhm’s Law

Solving for “V”Solving for “V”

• Cover “V”• Remaining formula is “P/I”• Meaning as power or current increases the

voltage will decrease• Giving voltage an inverse relationship to

the other two variables

Ohm’s LawOhm’s Law

Solving for “I”Solving for “I”

• Cover “I”• Remaining formula is “P/V”• Meaning as power or voltage increases the

resistance will decrease• Giving current an inverse relationship to the

other two variables

Practice ProblemPractice Problem

Ohm’s LawOhm’s Law

SolutionSolution

Practice:Practice:With a partner fill in the missing values from the tableWith a partner fill in the missing values from the table

60W 120 V ? Amps

100 W 40 V ? Amps

? W 60 V 0.2 Amps

40 W ? V 20 Amps

120 W ? V 10 Amps