What is the difference between efficacy and efficiency?

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Wiki User
2011-10-18 18:35:20

Well, efficacy is whether it works or not... whether it has that

capacity. Efficiency is not whether it works, but how well it

works... how quickly, how many people have to be involved, etc. If

you cut down the amount of time it takes or the amount of workers

it takes, then you are improving efficiency.

Here are the links for the words on if you would

like to investigate further:

"Answer" id="Answer">Answer

Efficacy is defined as 'that which brings about the

desired result'.

Efficiency, in engineering terms, is defined as 'the

ratio of a machine's output power to input power.

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