P1.1 - Heat & P1.2 - Energy & Efficiency Flashcards

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1
Q

What is infrared radiation?

A

Heat from radiation

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2
Q

What is the difference between shiny, light surfaces and black, matt surfaces in terms of heat?

A

Shiny, light surfaces absorb more

Black, matt surfaces emit more

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3
Q

How do objects heat and cool in terms of energy transfer?

A

If emits faster than absorbs -> cools

If emits slower than absorbs -> warms

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4
Q

Explain melting in terms of particles

A

Heated particles vibrate, so bonds weaken:

solid -> liquid

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5
Q

Explain boiling in terms of particles

A

Heated particles vibrate, bonds break and move randomly

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6
Q

What does a u-value measure?

A

The speed heat travels through a material

Lower u-value = better insulator

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7
Q

How can insulation pay for itself?

A

Low u-value walls and windows reduce heat loss
-> saves on heating cost

Eventually the money it saves = cost of insulation/ double glazing

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8
Q

How do solar panels work?

A

Solar panels use sun heat to heat water tubes -> hot water tank

Renewable energy - works best on sunny days

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9
Q

What is specific heat capacity?

A

Energy needed to increase temperature of 1kg of a substance by 1°C

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10
Q

What is the law of energy conservation?

A

Energy can’t be made or destroyed, only converted

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11
Q

Describe energy changes in a car

A

Chemical -> kinetic + heat

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12
Q

What does a sankey diagram show?

A

Energy transfer in a process

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