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GCSE Physics > P2 - Sustainable energy > Flashcards

P2 - Sustainable energy Flashcards

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1
Q

What are the 8 energy stores

A

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

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2
Q

What does a system mean (energy)

A

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

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3
Q

How can energy be transferred

A

Mechanical work
Electrical work
Heating

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4
Q

What happens in energy transfer by heating

A

Energy is transferred from a hotter region to a colder region

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5
Q

What is conduction

A

The vibrating particles transfer energy to their surrounding particlesW

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6
Q

What is convection

A

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

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7
Q

What is radiation

A

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

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8
Q

What is the same thing as work done

A

Energy transferred

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9
Q

What are the 2 types of work

A

Mechanical work or electrical work

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10
Q

What is the conservation of energy principle

A

Energy cannot be created or destroyed, only transferred

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11
Q

What does it mean if the energy is dissapated

A

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

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12
Q

What is dissipated energy called

A

Wasted energy

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13
Q

What is a closed system

A

A system where matter or energy cannot enter or leave

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14
Q

What is the net energy change in a closed system

A

Always zero

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15
Q

What is power in simple terms

A

The rate of energy transfer

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16
Q

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

A

Energy transferred = Power x Time

17
Q

What is one kWh

A

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

18
Q

What are kWh and J both measures of

A

Energy (transferred)

19
Q

What is 1 kWh in J

A

3 600 000

20
Q

What is the formula for efficiency

A

Efficiency = Useful energy transferred/total energy transferred

21
Q

How can you reduce energy losses in buildings

A

Thermal insultion

22
Q

What are the main non-renewable sources of energy

A

Coal, Oil, and Gas

23
Q

What is a renewable energy source

A

One that will never run out

24
Q

What are the man renewable energy sources

A

Biofuels, wind, solar, hydroelectric, tidal

25
Q

How do power stations generate electricity

A

they use steam to power a turbine

26
Q

What are the stages of a power station

A

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.

27
Q

What is a disadvantage of solar energy

A

Very expensive

28
Q

What is an advantage of solar energy

A

No environmental damage

29
Q

What can biofuels be made out of

A

Farm waste, animal droppings or plant matter.

30
Q

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

A

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

31
Q

Why do hydroelectric dams have a big impact

A

GCSE Physics (8 decks)

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