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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?

Answer 1

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

I am also not sure the kind of data you have but I would use: #"efficiency"=P_("out")/P_("in")xx100%# Where: #P# is the power in Watts or #"joule"/"seconds"# that measures the transformation (or use) of energy (in Joules) at each second. You basically consider the rate at which energy is "lost" during your transformation as a pecentage. Let say that you get

#0.4xx100%=40%#: this tells us that your machine is delivering only #40%# of the energy per second it absorbs or if you give #100J# each second to the machine #60J# are "lost" each second.

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Answer 2

Cora Andrews

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

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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.