power and efficiency

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Last updated 9:16 AM on 6/1/26
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6 Terms

1
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what is power?

the rate of energy transfer

2
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what is power measured in?

Watts (W)

3
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what is efficiency?

the proportion of total input energy divided by power that is converted to useful output energy

4
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what is thermal energy usually lost from?

conduction

5
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how can we reduce thermal loss?

insulation such as cavity walls, double glazing etc

6
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what is the insulation practical?

  1. pour hot water into beaker, start timer when temperature falls to chosen initial temperature

  2. after set time, measure final temperature

  3. repeat with different types of insulation around beaker or different numbers of layers of same insulation