What does the energy efficiency ratings on products mean?

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What does the energy efficiency ratings on products mean?

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Answer 1 · 2016-03-18T07:14:45

$Efficency(%) = \frac{useful energy}{total energy} \times 100$ $"Efficency(%)" = "useful energy"/"total energy" xx 100$

Explanation:

On a product there will be an efficiency number, this tells you how much of the energy produced is useful.

For example, a light bulb may be $20 %$ $20%$ efficient. If the bulb has a power of $100 W$ $"100 W"$ , only $20 W$ $"20 W"$ are useful, light energy, while the other $80 W$ $"80 W"$ are waste such as sound or heat.

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What does the energy efficiency ratings on products mean?

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