Energy

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  • Created by: Cat91
  • Created on: 10-06-18 08:46
What are the 8 types of energy stores?
Thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic and, nuclear.
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Whats a fancy word for a single or group of objects that you're interested in?
System.
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What happens when a system changes?
Energy is transferred.
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Can matter or energy leave a closed system?
No.
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What is the net change in the total energy of a closed system?
0.
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What is another say of saying energy transferred?
Work done.
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Is work done with or against the resistance in a circuit?
Against.
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What does kinetic mean?
Movement.
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Kinetic energy =
mass x speed / 2
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Energy lost from the g.p.e store =
Energy gained in the in the kinetic energy store.
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What does air resistance act against?
All falling objects.
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Elastic potential =
Spring constant x extension / 2
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What is specific heat capacity?
The amount of energy needed to raise the temperature of 1kg of a substance by 1 degree C.
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Does everything have the same SHC?
No.
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What is waters SHC?
4200J
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Can energy be crated or destroyed?
No, never.
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What is energy efficiency?
The percentage of useful energy transferred.
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What is a fancy term for wasted energy?
Dissipated energy.
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What is power?
The rate of energy transfer.
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What is power measured in?
Watts.
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What is energy measured in?
Joules.
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Power =
Energy transferred / Time.
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What is the main thing that conduction occurs in?
Solids.
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What is conduction?
The process where vibrating particles transfer energy to neighbouring particles.
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What does convection happen in?
Gases and liquids.
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What does lubrication do?
Reduce frictional forces.
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When objects are rubbed together they produce.....
Friction.
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What are lubricants?
They're usually liquids that coat objects to make them slippery (e.g, oil).
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Name some energy saving things to do to your house.
Cavity walls, loft insulation, double/triple glazed windows, draught excluders.
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Why are useful devices useful?
Because they can transfer energy from one object to another.
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How can you improve the energy efficiency of an object?
By insulating, lubricating or, making them streamlined.
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Efficiency =
Useful output energy / total input energy transfer.
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Can you calculate the efficiency if you have the power input and output?
Yes.
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Efficiency also =
Useful power output / total power input.
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Is there such thing as 100% energy efficiency?
Not usually.
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What is the only thing that's 100% energy efficient?
Electric heaters.
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What does all energy end up as?
Thermal.
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What are the 2 different types of energy resources?
Renewable and non-renewable.
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What does non-renewable mean?
That it will end one day.
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What does renewable mean?
That it will never run out.
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What is the main non-renewable energy source?
Fossil fuels.
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Name 3 fossil fuels.
Coal, oil and, natural gas.
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Do non-renewable resources damage the environment?
Yes.
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Why do we use non-renewable resources?
Because they make up most of our energy.
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Name 7 renewable sources.
The sun, wind, water waves, hydro-electricity, bio-fuel, tides, geothermal.
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What are the 2 obvious places for energy?
Transport and heat.
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How badly do renewable sources damage the environment?
Still not great but better than non-renewable sources.
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How do we get wind power?
Through wind turbines.
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What is solar power?
Sunlight.
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What is geothermal power?
Energy that's in volcanic areas.
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What is hydro-electric power?
Falling water.
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Are hydro-electric dams expensive?
Yes.
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How is wave power collected?
Wave powered turbines.
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What are tidal barrages?
They use the sun and the moons gravity.
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Why are tides pretty reliable?
Because they always happen twice a day.
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Is there any pollution in tidal barrages?
No.
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What are bio-fuels made from?
Plants and waste.
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Other cards in this set

Card 2

Front

Whats a fancy word for a single or group of objects that you're interested in?

Back

System.

Card 3

Front

What happens when a system changes?

Back

Preview of the front of card 3

Card 4

Front

Can matter or energy leave a closed system?

Back

Preview of the front of card 4

Card 5

Front

What is the net change in the total energy of a closed system?

Back

Preview of the front of card 5
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