1. Reformatted for Powerpoint by Megan Maller
Ohm’s Law and Power Law
Applied Ohm’s Law
From Wikiversity
Reformatted for Powerpoint by Megan Maller

2. Symbols to Understand V = Voltage I = Current R = Resistance P = Power
Symbols students must be familiar with:
V = Voltage
I = Current
R = Resistance
P = Power

3. Understanding Voltage, Current, Resistance, and Power
V= Voltage
v = volts
Voltage is the push of electrons through a wire, and is measured in volts.

4. Understanding Voltage, Current, Resistance, and Power
I = Current
A = amperes
Current is the flow of electrons through a wire, and is measured in amperes.

5. Understanding Voltage, Current, Resistance, and Power
R = Resistance
Ohms = Greek letter for omega, Ω.
Resistance slows or resists the electron flow in a wire and is measured in ohms.

6. Understanding Voltage, Current, Resistance, and Power
P = Power
Watts: a watts is defined as doing work at a rate of one joule per second

7. Equations of Ohm’s Law
Ohm’s Law is the relationship of voltage, resistance, and current in DC electrical circuits. It requires one volt of “push” to move one ampere of current through one ohm of resistance.
Ohm's law may be rearranged in three ways. It's important to be familiar with each of these.
V = I x R
I = V ÷ R
R = V÷ I

8. Equations of Power Law
Power Law describes the relationship between voltage, resistance, and watts.
Power’s Law equation is seen as:
P = V x I also as P = I2 x R or
P = V2÷R