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P1 Energy

Last updated 8 days ago

40 Nsɛmmisa

4.1.1.1 Energy Stores and systems

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4.1.1.1

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4.1.1.1

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4.1.1.2 Changes in energy

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4.1.1.3 Energy changes in systems

4.1.1.4 Power

4.1.2.1 Energy transfers in a system

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4.1.2.1

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4.1.2.1

4.1.2.2 Efficiency

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4.1.2.2

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4.1.2.2

4.1.3 National and global resources

Asemmisa {{asɛmmisaAhyɛnsode}}

1.

What is the unit of energy?

Joule

Watt

metres per second

Kilogram

Asemmisa {{asɛmmisaAhyɛnsode}}

2.

Which will have the higher value in its kinetic energy store?

A cyclist at 15 m/s

A car at 15 m/s

A bus at 15 m/s

A freight train at 15 m/s

Asemmisa {{asɛmmisaAhyɛnsode}}

3.

What is the name for the store of energy that we associate with foods?

Chemical energy store

Internal energy store

Thermal energy store

Asemmisa {{asɛmmisaAhyɛnsode}}

4.

Which will have the most gravitational potential energy?

A person on the back of a horse

A person parachuting from a skyscraper

A person stood on a house

A person stood on a box

Asemmisa {{asɛmmisaAhyɛnsode}}

5.

From you equation sheet, which equation is for Gravitational Potential Energy?

Ep = mgh

Ee = 1/2ke²

Ek = 1/2mv²

1

Asemmisa {{asɛmmisaAhyɛnsode}}

6.

Of the objects shown, which one(s) do not have energy in their kinetic energy stores?

A

B

C

D

4.1.1.1

Asemmisa {{asɛmmisaAhyɛnsode}}

7.

An athlete is sprinting. When they are doing this, they have 400 J in their kinetic energy store. How will the number of joules in their kinetic energy store be different if they slow down to walking pace?

More than 400J

Exactly 400J

Less than 400J

Asemmisa {{asɛmmisaAhyɛnsode}}

8.

What happens to the chemical energy store within a fuel as it is used?

Increases

Decreases

No change

Asemmisa {{asɛmmisaAhyɛnsode}}

9.

The battery in a torch has 20J of chemical energy store when it is full. 5J is transferred from the battery. How much is left?

20

15

5

Asemmisa {{asɛmmisaAhyɛnsode}}

10.

What energy store is involved when objects heat up or cool down?

Chemical

Kinetic

Internal

Thermal

Asemmisa {{asɛmmisaAhyɛnsode}}

11.

What energy store is involved in fuels, food and batteries?

Internal

Chemical

Thermal

Kinetic

Asemmisa {{asɛmmisaAhyɛnsode}}

12.

How is energy moved between energy stores?

Transfer

Loss

Floating

Magic

Asemmisa {{asɛmmisaAhyɛnsode}}

13.

Which thermal energy store has changed the most in the following?

1 kg of water heated up by 10°C

1 kg of water heated up by 50°C?

Asemmisa {{asɛmmisaAhyɛnsode}}

14.

Which thermal energy store has changed the most in the following?

20 g of wax heated up by 1°C

20 g of wax heated up by 2°C?

Asemmisa {{asɛmmisaAhyɛnsode}}

15.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, how much energy is transferred by radiation into sound?

95J

89J

101J

Asemmisa {{asɛmmisaAhyɛnsode}}

16.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, the rest is transferred by radiation into sound. Name the useful energy transfer

Kinetic Energy

Dissipated as Heat

Transferred by radiation into sound

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17.

A speaker has 95J of kinetic energy. 6J of energy is dissipated as heat, the rest is transferred by radiation into sound. Name the wasted energy transfer

Kinetic Energy

Dissipated as Heat

Transferred by radiation into sound

Asemmisa {{asɛmmisaAhyɛnsode}}

18.

If a transfer has an efficiency of 0.75, we can also write this as being __% efficient.

25 %

75 %

0.75%

7.%%

Asemmisa {{asɛmmisaAhyɛnsode}}

19.

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

Asemmisa {{asɛmmisaAhyɛnsode}}

20.

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

Asemmisa {{asɛmmisaAhyɛnsode}}

21.

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

Asemmisa {{asɛmmisaAhyɛnsode}}

22.

If 100 J is input and 30 J is useful, what is energy loss?

70 J

100 J

30 J

60 J

Asemmisa {{asɛmmisaAhyɛnsode}}

23.

With 200 J input and 50 J useful, what is energy loss?

100 J

150 J

50 J

200 J

Asemmisa {{asɛmmisaAhyɛnsode}}

24.

If 250 J input gives 75 J useful, what is the waste?

100 J

175 J

75 J

250 J

Asemmisa {{asɛmmisaAhyɛnsode}}

25.

Input energy of 400 J, and output energy is 150 J, loss?

300 J

250 J

400 J

150 J

Asemmisa {{asɛmmisaAhyɛnsode}}

26.

With 500 J input and 200 J useful, energy loss is?

200 J

150 J

500 J

300 J

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27.

If 600 J input produces 180 J useful, energy lost?

180 J

300 J

420 J

600 J

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28.

Input of 350 J, useful output 100 J, what’s lost?

350 J

200 J

100 J

250 J

Asemmisa {{asɛmmisaAhyɛnsode}}

29.

With 800 J input and 350 J useful, energy loss is?

350 J

450 J

800 J

300 J

Asemmisa {{asɛmmisaAhyɛnsode}}

30.

If you have 900 J input and 400 J useful, loss?

300 J

400 J

900 J

500 J

Asemmisa {{asɛmmisaAhyɛnsode}}

31.

If the input energy is 100 J and useful energy is 30 J, what is the efficiency?

100%

30 J

70%

30%

Asemmisa {{asɛmmisaAhyɛnsode}}

32.

Input energy is 200 J, and useful energy is 50 J. What is the efficiency?

75%

50%

200 J

25%

Asemmisa {{asɛmmisaAhyɛnsode}}

33.

An engine has 120 J input energy and 60 J useful work. Calculate the efficiency.

120 J

50%

60%

25%

Asemmisa {{asɛmmisaAhyɛnsode}}

34.

If the input energy is 150 J and the useful energy is 120 J, what efficiency does it have?

80%

120 J

20%

150%

Asemmisa {{asɛmmisaAhyɛnsode}}

35.

With an input energy of 80 J and useful energy of 20 J, find the efficiency.

50%

80%

25%

20%

Asemmisa {{asɛmmisaAhyɛnsode}}

36.

For 300 J input and 240 J useful energy, what's the efficiency?

20%

80%

300 J

240%

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37.

A device uses 400 J input energy and outputs 100 J usable energy. What is the efficiency?

100%

75%

25%

400%

Asemmisa {{asɛmmisaAhyɛnsode}}

38.

Calculate efficiency for 60 J input energy with 15 J useful energy.

25%

60%

40%

15 J

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39.

Input energy is 500 J with useful energy as 250 J. What's the efficiency?

50%

25%

250%

500 J

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40.

An appliance uses 1000 J input and provides 500 J useful energy. Find the efficiency.

25%

100%

50%

500%