Free Printable electric energy and power

Worksheets

electric energy and power

Total questions: 20

Worksheet time: 13mins

Name

Class

Date

What is the energy possessed by a charge due to its position in an electric field?

electrical potential energy

electrical kinetic energy

electrical mechanical energy

electrical potential difference

Electric power is the rate at which charge carriers

pass through an area

do work

move through a potential difference

collide with atoms

superconductor

material with high resistance

material with low resistance

material with half resistance

material with zero resistance

kWh stand for

kilowestohm

kilometwer

kilowatt hour

kilowatt hour is equa to

1000W for 3600s

1500W for 3600s

1000W for 3000s

500W for 10s

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

10.

If electrical power costs $0.12/kwh, and I use 9 x 10⁸ Joules of electrical energy, what will I be charged?

$10

$20

$30

$40

11.

Efficiency is...

The percentage of energy that is actually used to do work

The stuff in the walls that keeps energy in

12.

Leaving lights on in vacant rooms, washing clothes in hot water, and driving alone are examples of what?

low energy efficiency

moderate energy efficiency

high energy efficiency

13.

Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?

Chemical to light

Electrical to chemical

Electrical to light

Chemical to electrical

14.

In energy transformations, "wasted energy" usually takes what form?

heat

chemical energy

light

sound waves

15.

Total energy = 350J
Useful energy = 70J

Workout the efficiency of this iphoneX.
$efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%$

100%

80%

40%

20%

16.

This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?

13600J

3600J

5000J

8600J

17.

An open system is...

an object with a hole in it

an object which gains or loses energy

an object which does not let energy in or out

an object that is outside

18.

one method of reducing dependence on fuel wood biomass, particularly in developing countries, and thereby reducing deforestation is to implement the use of

photovoltaic solar systems to serve home heating needs

solar cookers instead of wood fired stoves

Hydrogen fuel cell stoves instead of wood fired stoves

hybrid electric heaters instead of fires

wind powered refrigeration

19.

Corn, wheat, and soybeans can be made into a substance called ethanol. In some places, ethanol is part of a mixture used to power cars and trucks. What type of alternative energy resource is ethanol?

Hydroelectric

Geothermal

Biofuels

Solar

20.

Which type of alternative energy source is shown in this picture?

Wind