The input power to a machine is 1500 W and its efficiency is 80%. Then, the output power by the machine is :

800 W

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1100 W

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1200 W

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1500 W

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Solution

The correct option is C
1200 W

Input Power = 1500 W

n=80%

n= $\frac{O u t p u t P o w e r}{I n p u t P o w e r}$

$\Rightarrow$ Output power = $n \times$ input power
= 0.8 $\times$ 1500 W
= 1200 W

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The input power to a machine is 1500 W and its efficiency is 80%. Then, the output power by the machine is :

The correct option is C 1200 W Input Power = 1500 W n=80% n= Output PowerInput Power ⇒ Output power = n× input power = 0.8 × 1500 W = 1200 W

The correct option is C
1200 W

Input Power = 1500 W

n=80%

n= $\frac{O u t p u t P o w e r}{I n p u t P o w e r}$

$\Rightarrow$ Output power = $n \times$ input power
= 0.8 $\times$ 1500 W
= 1200 W