P2 - Sustainable energy

Question 1

What are the 8 energy stores

Answer 1

Thermal energy
KE
GPE
Chemical energy
Nuclear energy
Electromagnetic energy
Electrostatic energy

Question 2

What does a system mean (energy)

Answer 2

A single or group of objects, which you are looking at the energy stores in them

Question 3

How can energy be transferred

Answer 3

Mechanical work
Electrical work
Heating

Question 4

What happens in energy transfer by heating

Answer 4

Energy is transferred from a hotter region to a colder region

Question 5

What is conduction

Answer 5

The vibrating particles transfer energy to their surrounding particlesW

Question 6

What is convection

Answer 6

Where the energetic, hot particles, move away from hotter to colder reigons

Question 7

What is radiation

Answer 7

When energy is transferred by waves, e.g EM waves or sound waves

Question 8

What is the same thing as work done

Answer 8

Energy transferred

Question 9

What are the 2 types of work

Answer 9

Mechanical work or electrical work

Question 10

What is the conservation of energy principle

Answer 10

Energy cannot be created or destroyed, only transferred

Question 11

What does it mean if the energy is dissapated

Answer 11

Not transferred to the store you want - usually to the thermal energy store of the surroundings

Question 12

What is dissipated energy called

Answer 12

Wasted energy

Question 13

What is a closed system

Answer 13

A system where matter or energy cannot enter or leave

Question 14

What is the net energy change in a closed system

Answer 14

Always zero

Question 15

What is power in simple terms

Answer 15

The rate of energy transfer

Question 16

How do you work out the total energy transferred based on the power of the appliance, and the time it was on for

Answer 16

Energy transferred = Power x Time

Question 17

What is one kWh

Answer 17

The amount of energy a device with 1kW of power transferred is one hour

Question 18

What are kWh and J both measures of

Answer 18

Energy (transferred)

Question 19

What is 1 kWh in J

Answer 19

3 600 000

Question 20

What is the formula for efficiency

Answer 20

Efficiency = Useful energy transferred/total energy transferred

Question 21

How can you reduce energy losses in buildings

Answer 21

Thermal insultion

Question 22

What are the main non-renewable sources of energy

Answer 22

Coal, Oil, and Gas

Question 23

What is a renewable energy source

Answer 23

One that will never run out

Question 24

What are the man renewable energy sources

Answer 24

Biofuels, wind, solar, hydroelectric, tidal

Question 25

How do power stations generate electricity

Answer 25

they use steam to power a turbine

Question 26

What are the stages of a power station

Answer 26

Fuel is burned, and the heat evaporates water, which moves a turbine. The turbine is connected to a generator generates a potential difference (and so a current) across it.

Question 27

What is a disadvantage of solar energy

Answer 27

Very expensive

Question 28

What is an advantage of solar energy

Answer 28

No environmental damage

Question 29

What can biofuels be made out of

Answer 29

Farm waste, animal droppings or plant matter.

Question 30

Why is there no net change in CO2 when you burn biofuels

Answer 30

Because they are being planted at the same rate they are being burned, so they take in just as much CO2 as they release

Question 31

Why do hydroelectric dams have a big impact