Insulation & energy transfer Flashcards

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1
Q

Describe the concept of insulation.

A

Insulation refers to preventing the movement of hear energy in or out of an object.

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2
Q

Explain how a solar water heater works.

A

Heat energy from the sun is used to heat up water flowing through black tubes or another substance that then heats the water.

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3
Q

What do ‘insulating materials’ do in a house?

A

Prevent heat loss in winter (keep house warm) or heat gain in summer (keep house cool).

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4
Q

What kinds of surfaces absorb heat most effectively?

A

Black, dull surfaces.

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5
Q

What is ‘wasted energy’?

A

Energy that escapes to the surroundings and does no useful work.

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6
Q

Describe ‘energy efficiency’.

A

A measure of how much input energy is converted into useful work.

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7
Q

How much chemical potential energy from coal is converted into useful electrical energy in a coal-fired power station?

A

Only about a third.

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