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What does the energy efficiency ratings on products mean?

Answer 1

#"Efficency(%)" = "useful energy"/"total energy" xx 100#

An efficiency number indicates how much of the energy produced is useful and can be found on a product.

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

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Answer 2

Caleb Allen

Energy efficiency ratings on products indicate their level of energy efficiency, typically measured in terms of energy consumption relative to performance. Higher ratings signify better energy efficiency, meaning the product consumes less energy to accomplish its intended function. These ratings help consumers make informed decisions by comparing the energy efficiency of different products within the same category.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.