Advertisements
Advertisements
प्रश्न
State the S.I. unit of power.
What is the SI unit of power.
Advertisements
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`
APPEARS IN
संबंधित प्रश्न
When do we say that work is done?
Give reasons for the following. No work is done if a man is pushing against a wall.
When is work said to be done by a force?
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
Each of the following statement describes a force acting. Which force is causing work to be done?
Does the earth move around the sun with a uniform velocity?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.

(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
