Power

Posted by Sek | 2:58 AM | , , | 0 comments »

Power

Power is the rate at which work is done, which means how fast a work is done.

Formula:
Example 1
An electric motor takes 20 s to lift a box of mass 20kg to a height of 1.5 m. Find the amount of work done by the machine and hence find the power of the electric motor.

Answer:
Work done,
W = mgh = (20)(10)(1.5) = 300J

Power,
\[ P = \frac{W}{t} = \frac{{300}}{{20}} = 15J\]


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