Free Printable ENERGY EFFICIENCY

1.

Efficiency is calculated by useful energy output divided by total energy input, expressed as a percentage

a)

False

b)

True

2.

The house illustrated here uses panels on the roof to collect a natural resource and convert it into electricity that can be used.
Which alternative energy source does this house use?

a)

Water

b)

Wind

c)

Solar

d)

Geothermal

3.

What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J or work are done by the machine?

a)

0.25 Joules

b)

26%

c)

3.86 Joules

d)

386%

4.

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%

5.

Total energy = 350J
Useful energy = 70J

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

a)

100%

b)

80%

c)

40%

d)

20%

6.

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%

7.

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

a)

13600J

b)

3600J

c)

5000J

d)

8600J

8.

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%

9.

What is the efficiency of the machine if the input is 263 J and the output is 142 J?

a)

6.26%

b)

54%

c)

100%

d)

260%

ENERGY EFFICIENCY

Total questions: 9

Worksheet time: 9mins

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