Describe the term efficiency (using words).
Efficiency is a measure of the proportion of energy (or power) that is transferred usefully.
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What are the 2 formulas for efficiency?
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For a light bulb, what is the 'useful' energy output?
Light energy.
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For a light bulb, what is the main 'wasted' energy output?
Heat energy.
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Efficiency is usually given as a decimal, such as 0.6. How would we convert this to percentage efficiency?
Multiply the value by 100.
0.6 x 100 = 60 %
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