Free Printable 07 Energy 2

1.

Energy is…

a)

An action that results in using less energy

b)

The ability to do work or make a change

c)

Thunder

d)

the energy of motion

2.

What is power measured in?

a)

Joules (J)

b)

Watts (W)

c)

Kiliwatt-hours (kWh)

d)

Volts (V)

3.

What type of diagram is used to show energy efficiency?

a)

Bar chart

b)

Sankey diagram

c)

Flow chart

d)

Power diagram

4.

How do we calculate percentage efficiency?

a)

(useful energy out ÷ total energy in) × 100

b)

(useful energy in ÷ total energy out) x 100

c)

(total energy out ÷ useful energy in) x 100

5.

Calculate the efficiency of a bulb with an input energy of 50J, which outputs 40J of thermal energy and 10J of light energy.

a)

10%

b)

20%

c)

25%

d)

50%

6.

You have used 784 kWh of electricity since your last meter reading. Each kWh costs 14p. Calculate the cost of your bill.

a)

£56.00

b)

£109.76

c)

£560.00

d)

£10976.00

7.

Which kinds of appliances transfer the most energy?

a)

heaters and cookers

b)

lights

c)

TVs and radios

d)

computers

8.

The Law of Conservation of Energy states:

a)

Energy can created or destroyed but not transformed

b)

Energy cannot be created or destroyed, it can only transformed

c)

Energy can't be created, destroyed or transformed

d)

Energy cannot be created or destroyed.

9.

Total energy = 200J
Useful energy = 20J

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

a)

100%

b)

80%

c)

40%

d)

10%

10.

Total energy = 34000J
Useful energy = 340J

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

a)

100%

b)

10%

c)

40%

d)

20%

11.

A car transfers 100 J of chemical energy in order to gain 50 J of kinetic energy. The efficiency of the car is

a)

20%

b)

0.5%

c)

50%

d)

200%

12.

Power is a measure of how much ______ can be done in a set amount of ______.

a)

Work, Time

b)

Work, Energy

c)

Energy, Force

d)

Force, Work

13.

Work is a measure of the energy needed to apply a force across a _______.

a)

time

b)

distance

c)

gravity

d)

object

14.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

15.

What type of device might this Sankey be about?

a)

A very efficient LED light bulb

b)

A very inefficient incandescent light bulb

c)

A coal power plant

d)

A wind turbine

16.

To save energy, what should you do when you leave a room ?

a)

USE ELECTRICAL ENERGY

b)

SHUT OFF THE LIGHTS AND TELEVISION

c)

TURN ON THE LIGHTS AND TELEVISION

d)

HANG YOUR CLOTHES OUTSIDE

17.

How can you dry your clothes to save energy?

a)

Use the dryer machine

b)

Don't dry your clothes

c)

Leave the fridge door open

d)

Hang the clothes to dry outside on a line

18.

What is energy conservation?

a)

Adding up all your energy use

b)

Reducing energy use

19.

A (a) diagram shows the energy transfers in a system.

20.

Which bulb is the most efficient?

a)

Filament bulb

b)

LED light

c)

CFL lamp

21.

What does J stand for?

a)

Joules

b)

Jellies

c)

Jangs

d)

Julls

22.

What is waste energy usually released as?

a)

Heat energy

b)

Kinetic energy

c)

Chemical energy

d)

Electrical energy

23.

What is the useful energy output for a hairdryer that has an input energy of 9J and waste output energy of 5J?

a)

4J

b)

14J

c)

45J

d)

9J

24.

How much is 1 W?

a)

1 J per second

b)

10 J per second

c)

1 J per minute

d)

10 J per minute

25.

How much electrical energy does a 20 W electric light use every second to stay lit?

a)

20 J

b)

200 J

c)

1 J

d)

10 J

07 Energy 2

Total questions: 25

Worksheet time: 1hrs 29mins

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