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Application Task - Efficiency Calculations 290121

Last updated about 5 years ago

15 questions

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Question 1

1.

A petrol engine has a total input of 80000W and a useful output of 28000W. What is the efficiency of the engine as a decimal?

Question 2

2.

A bike uses 20J of energy, 2J are wasted in sound, 18J turn into kinetic energy. What is the efficiency of the bike as a percentage?

Question 3

3.

If an electric oven is 70% efficient, what does this mean?

Question 4

4.

A kettle uses 63J of energy and it produces 58J of heat, what is the efficiency of the kettle in a decimal?

Question 5

5.

What is the efficiency of a phone if it uses 31J and wastes 19J of energy as a percentage?

Question 6

6.

How much energy does a toaster use if the efficiency is 0.40 and it produces 30J of heat energy?

Question 7

7.

An electric fan has a useful output of 200J and an efficiency of 8%, what is the total input of the fan?

Question 8

8.

A speaker gives out 80J of sound energy. Calculate the total input energy if its efficiency is 0.35.

Question 9

9.

A drill has an efficiency rating of 65% and uses 250W of energy, how much of the energy is useful?

Question 10

10.

A vacuum uses 150J of energy, 10J is wated in sound, what is the efficiency of the vacuum.

Question 11

11.

How much energy does a mixer use if the efficiency is 48% and it wastes 20J of energy?

Question 12

12.

A gas boiler has a total output of 13000W and an efficiency of 0.9%, what is the useful output power of the boiler?

Question 13

13.

A TV has an efficiency of 86%. If the input power is 2600W, calculate the useful output power.

Question 14

14.

A speaker gives out 200J of sound energy. Calculate the total input energy if its efficiency is 78%.

Question 15

15.

A motor has an efficiency of 45%. if the input power is 32000W, calculate the useful output power.