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Physics > Energy Transfers > Flashcards

Energy Transfers Flashcards

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1
Q

Give 5 energy stores

A 
Chemical
Kinetic 
Gravitational 
Elastic
Thermal
Magnetic
Electrostatic
Nuclear
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2
Q

Give 3 energy transfers

A

Mechanically
Electrically
By heating
By radiation (light and sound)

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3
Q

What is the conservation of energy

A

This means there is the same amount of energy after a transfer as there was before it.

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4
Q

How do you find how efficient it is

A

Useful energy output
Efficiency = ———————————- (x 100)
Total energy input

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5
Q

Efficiency is always less than….% because of the unwanted energy always produced

A

100%

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6
Q

Energy is often lost to heat due to…..

A

Friction

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7
Q

What input of energy does a battery have

A

Chemical

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8
Q

What is the output of an engine

A

Kinetic

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9
Q

Give 2 objects that need light as an input

A

Solar Panels

Plants

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10
Q

What state is only possible for conduction

A

Solid

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11
Q

Conduction takes place by heat energy passing from….to……but the material itself does not…..

A

Particle to Particle

Move

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12
Q

Which type of solid is very good at conduction

A

Metals

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13
Q

What states of matter can convection only happen in

A

Liquids and gasses

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14
Q

What happens when a liquid or gas is heated

A

It expands

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15
Q

Give the process of convection (5 stages)

A

The liquid or pass is heated, and expands
Its volume increases
So its density decreases
So it rises
Cooler, more dense fluid sinks to take its place producing convection currents

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16
Q

The…..does not rise. Instead the…….do

A

Heat

Substances

17
Q

What is different about radiation to the other heat transfers.

A

It can travel through a vacuum (needs no particles)

18
Q

What type of radiation does it use

A

Infa-red

19
Q

Give an example of radiation as a heat transfer

A

The heat from the sun to the Earth

20
Q

Can radiation happen in all states

A

Yes

21
Q

What do convection,, conduction and radiation all do the same

A

TRANSFER ENERGY!

22
Q

Which surface colour absorbs the most heat

A

Matt black

23
Q

Give 2 examples of convection in everyday life

A

Radiator

Chimney

24
Q

What does insulation do

A

Prevents energy loss (heat loss)

25
Q

What do insulating materials do

A

These are non-metals such as plastic and air to reduce the conduction of heat

26
Q

What colour is best for insulating

A

What as it is a poor absorber and emitter of heat radiation.

27
Q

By insulating, how does it help to have small pockets of air

A

This means that conduction can’t take place

Physics (23 decks)

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