Free Printable C1e Efficiency

1.

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%

2.

A lightbulb with efficiency of 10% would be

a)

efficient

b)

inefficient

3.

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%

4.

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

5.

What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%?

a)

2,690J

b)

92.3J

c)

0.0082J

d)

2,584.4

6.

What is the useful work output of a machine that consumes 2,800 Joules and an efficiency of 0.4?

a)

7000 J

b)

2760 J

c)

1120 J

7.

What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 90%?

a)

25200 J

b)

2520 J

c)

0.0082J

d)

0.025J

8.

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

a)

heat

b)

chemical energy

c)

light

d)

sound waves

9.

Flash is the most powerful superhero because...

a)

He can do the most in the least amount of time.

b)

He can do the most.

c)

He can move the fastest.

d)

He isn't.

10.

Total energy = 250J
Useful energy = 50J

Workout the efficiency of these fairy lights. $efficiency\ =\ \frac{useful\ energy\ output}{total\ energy\ input}$

a)

0.13

b)

0.14

c)

0.2

d)

0.25

C1e Efficiency

Total questions: 10

Worksheet time: 14mins

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