# I need to find the energy efficiency of an elevator. I have found 2 energy efficiency equations on the internet but don't know which one to use. Could someone tell me which one to use?

I am not sure this is going to help but...

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Use the equation: Energy Efficiency (%) = (Useful Energy Output / Total Energy Input) * 100.

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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.

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.

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.

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