Physics: Year 9 Term 1: Energy & Efficiency

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What is the equation for efficiency? (1)
Efficiency (%) = (Total useful output (J) / Total input) x 100
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What is the highest efficiency a machine can be? (1)
100%
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List 4 ways machines waste energy. (4)
Friction between parts, Hot wires, Air resistance, Sound
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The greater the [what?] the more efficient.
% result (or decimal)
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Efficiency can be improved by... (1)
Reducing waste energy
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Other cards in this set

Card 2

Front

What is the highest efficiency a machine can be? (1)

Back

100%

Card 3

Front

List 4 ways machines waste energy. (4)

Back

Preview of the front of card 3

Card 4

Front

The greater the [what?] the more efficient.

Back

Preview of the front of card 4

Card 5

Front

Efficiency can be improved by... (1)

Back

Preview of the front of card 5

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