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प्रश्न
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उत्तर
Electric power is the rate at which an electric circuit transfers electrical energy per unit of time.
The SI unit of power is the watt, one joule per second
`P = "work"/"time in Secs" = w/t`
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
State the S.I. unit of energy.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
A boy does work when he pushes against a brick wall. (yes/no).
Is power a scalar or a vector quantity?
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
