Examples of Power Calculations:

Here are some examples of how to use the power formula:

1. A light bulb with a resistance of 10 ohms is connected to a 12-volt battery. What is the power consumed by the light bulb?

P = VI = (12V) (1A) = 1W

2. A motor draws 5 amperes of current from a 24-volt power supply. What is the power consumed by the motor?

P = VI = (24V) (5A) = 120W

3. A household appliance has a power rating of 1,000 watts. How much current does it draw from a 120-volt outlet?

I = PV=1,000W120V=8.33APV=1,000W120V=8.33A