Energy

Question 1

What is energy measured in?

Answer 1

Joules or kilojoules

Question 2

What are the three fossil fuels?

Answer 2

Coal, oil and gas

Question 3

What will happen if you use less energy then you take in?

Answer 3

The energy will get stored as body fat and you will gain weight

Question 4

Butter stores a lot of energy per 100g

True/False

Answer 4

True

Question 5

Celery stores a lot of energy per 100g

True/False

Answer 5

False

Question 6

More energy is used to stand than is used to sit.

True/False

Answer 6

True

Question 7

To lose weight, you should eat more fruit and vegetables

True/False

Answer 7

False

Question 8

You don’t use energy when you are sleeping.

True/False

Answer 8

False

Question 9

What is heat?

Answer 9

Heat is a form of energy. It is the average kinetic energy of all the particles in a body

Question 10

What is temperature?

Answer 10

Temperature is a measure of how hot or cold a body is but does not tell us how much heat energy a body contains. It is measured in degrees Celsius (°C) or kelvin(K)

Question 11

What do fuels respire with?

Answer 11

Oxygen

Question 12

Fuels + oxygen ->

Answer 12

Carbon dioxide +water + energy

Question 13

What type of energy is fuel?

Answer 13

Chemical energy

Question 14

What type of energy is in food?

Answer 14

Chemical energy

Question 15

How does a power station work?

Answer 15

Heat energy from the fuel is transferred to the water in the boiler. The water boils rapidly and high pressure steam is generated. This then turns the turbine creating kinetic energy. This energy from the turbine then goes into a generator to make electrical energy.

Question 16

What is non-renewable energy?

Answer 16

Once it is used it can’t be used again-e.g coals, oils, gas, nuclear

Question 17

What is renewable energy?

Answer 17

It can be used again e.g wind, solar, tidal, waves, hydroelectric, geothermal and biomass. If you can replace it within your lifetime, 75 years, it is renewable

Question 18

What are the three types of thermal heat transfers?

Answer 18

Conduction, convection and radiation

Question 19

What is conduction?

Answer 19

In conduction the particles transfer energy by colliding with each other when they vibrate. The energy transfers until the two sides are the same heat. If one side is being continuously heated one side will always be hotter than the other. Some materials are harder to transfer energy through than others. Gases and liquids don’t conduct well as the particles are further apart.

Question 20

What is convection?

Answer 20

Convection is when you heat up a gas or a liquid and it rises. This happens as the particles that are being heated, have more energy, spread out and rise this leaves the area where the warm particles where less dense. This means that the cold air falls into the gap.

Question 21

What is radiation?

Answer 21

Infrared radiation travels as waves not by particles. This allows it to travels through a vacuum like space. The sun energy is transferred by radiation that is how it travels through space. Infrared radiation is also known as ‘thermal radiation’ or ‘heat’

Question 22

How do you calculate work?

Answer 22

Work = force x distance

Question 23

What is power?

Answer 23

Power is the rate at which work is done

Question 24

How do you calculate power?

Answer 24

(Work x distance)divided by time taken = power

Question 25

What is the unit for power?

Answer 25

Watts (w) 1KW = 1000W

Question 26

What is work?

Answer 26

The term ‘work’ means the amount of energy transferred to a body