Among the following the correct expression of efficiency is

\frac{O u t p u t e n e r g y}{I n p u t e n e r g y}

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\frac{W o r k d o n e b y t h e m a c h i n e}{W o r k d o n e o n t h e m a c h i n e}

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\frac{L o a d}{E f f o r t}

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All the above

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Solution

The correct option is A $\frac{O u t p u t e n e r g y}{I n p u t e n e r g y}$
$e f f i e c i e n c y = \frac{e n e r g y o u t p u t}{e n e r g y i n p u t}$
Hence,
option $(A)$ is correct answer.

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Among the following the correct expression of efficiency is

The correct option is A Output energyInput energyeffieciency=energyoutputenergyinputHence,option (A) is correct answer.

The correct option is A $\frac{O u t p u t e n e r g y}{I n p u t e n e r g y}$
$e f f i e c i e n c y = \frac{e n e r g y o u t p u t}{e n e r g y i n p u t}$
Hence,
option $(A)$ is correct answer.