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Electric Power

An electric m...

Question

An electric motor produces a tension of 4500 N in a load lifting cable and rolls it at the rate of 2m/s. The power of the motor is

A

9 KW

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B

15 KW

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C

225 KW

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D

9

\times

10

^{3}

HP

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Solution

The correct option is A 9 KW
Given
$F = 4500 N$
$v = 2 m s^{- 1}$
The power of motor is given by
$P = F . v$
$P = 45000 \times 2$
$P = 9000 W = 9 k W$

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