Energy

Question 1

What is heat conduction

Answer 1

When particles that are very close together transfer heat as they vibrate

Question 2

Convection only occurs in

Answer 2

Fluids

Question 3

What is convection

Answer 3

When the more energetic particles move from the hotter region to the cooler region and transferring energy as they do

Question 4

Why are metals good conductors

Answer 4

They have a special structure that means their electrons are delocalised

Question 5

Which block will ice melt quicker on: wood or metal?

Answer 5

Metal because conduction occurred- the metal transferred energy to the ice from the room

Question 6

Describe convection

Answer 6

• as fluid heated the particles gain more energy and vibrate more
• so they take up more space
• so they are less dense
• less dense fluid rises above dense fluid
• cooler fluid falls to take place of hotter fluid
  Process continues

Question 7

Give one example of where convection is useful

Answer 7

Immersion heater (heater coils at the bottom corner of a domed tank)

Question 8

Radiation doesn’t need particles to transfer heat

Answer 8

Radiation is a wave that can travel through a vacuum

Question 9

What type of wave is radiation

Answer 9

EM Wave

Question 10

Describe the experiment used to find the types of surfaces best at emitting heat radiation

Answer 10

Put boiling water in a Leslie cube
- wait a few minutes
- measure the heat coming off each side ensuring thermometer is the same distance each time
- repeat three times

Question 11

Two different ways efficiency can be displayed in

Answer 11

Percentage
Decimal

Question 12

Material that are bad conductors

Answer 12

Glass and plastic

Question 13

Disadvantages of solar power

Answer 13

Don’t work in the night and in some climates
Visually unattractive
Takes up a lot of space

Question 14

what is another way of saying energy transferred

Answer 14

work done

Question 15

what is the unit for work done

Answer 15

joules or newton metres

Question 16

advantages of fossil fuels

Answer 16

• reliable
• can produce large amounts of energy with fairly short notice

Question 17

disadvantages of fossil fuels

Answer 17

• porduces significamt greenhouse gases and pollution

Question 18

disadvantages of fossil fuels

Answer 18

• produces significant greenhouse gases and pollution

Question 19

advantages of nuclear power

Answer 19

• reliable
• produces no greenhouse gases or pollution
• a large amount of energy is produced with a small amount of fuel

Question 20

disadvantages of nuclear power

Answer 20

• produces dangerous amounts of radioactive waste that takes thousands of years to decay

Question 21

advantages of bio-fuel energy

Answer 21

• the CO2 produced while burning the fuel is equal to the amount absorbed while making it

Question 22

disadvantages of biofuels

Answer 22

• takes up a lot of land to grow and consumes resources needed for food production

Question 23

advantages of wind energy

Answer 23

• produces no greenhouse gases
• the land around can still be used for farming

Question 24

disadvantages of wind energy

Answer 24

• unreliable
• can be noisy and ugly
• not everywhere is suitable

Question 25

advantages of hydroelectric power

Answer 25

- reliable and can produces a large amount of energy on short notice - produces no greenhouse gases or pollution

Question 26

disadvantages of hydroelectric power

Answer 26

- can involve flooding large areas destroying habitats and homes

Question 27

advantages of tidal power

Answer 27

- very predictable - large amount of energy produced at regular intervals

Question 28

disadvantages of tidal power

Answer 28

- very few suitable locations - can cause harm to environments and disrupt shipping

Question 29

advantages of geothermal power

Answer 29

- reliable - geothermal stations are usually small

Question 30

disadvantages of geothermal power

Answer 30

- can result in the release of harmful gases from underground - not many suitable places

Question 31

advantages of solar power

Answer 31

produces no greenhouse gases or pollution - good for producing energy in remote places

Question 32

disadvantages of solar power

Answer 32

- unreliable (only when sunny) - use up a lot of farmland