Electric Energy and Power

The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?

• 170 W

• 170 A

• 1.7 V

• 1.7 W

If an oven has a power of 2000 W and the voltage is 230 V what is the current requirement?

• 3A

• 5A

• 13A

Electric power is the rate at which charge carriers

• pass through an area

• do work

• move through a potential difference

• collide with atoms

What does power mean?

• Joules transferred per second

• Electron flow per second

• Speed of electrons

• Electron energy

Which of the following equations is an equation for power, involving current and resistance?

• P= I/V

• P = IR

• P = IVR²

• P = I²R

Which of the following is an equation for power, involving voltage and resistance?

• P = V/R

• P = V²/R

• P = VR

• P = V²R²

A kilowatt-hour is equal to ____________ joules.

• 3,600

• 360,000

• 3,600,000

• 360,000,000

What is the unit of power?

• ohm

• volt

• ampere

• watt

What does the pie chart show?

• The amount of electricity used in an average home. 

• All of the devices that use electricity. 

• Which are the best devices for energy. 

• None of these

What group of devices uses the most electricity in the average home? 

• Lighting and Heater

• Refrigerator 

• Computer's, TV's, and other device 

• Heater and Water Heater