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प्रश्न
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उत्तर
SI unit of power = watt
CGS unit of power = erg per second
1` W = 1 J s -1 = 107 erg s -1
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संबंधित प्रश्न
Define 1 joule of energy.
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
Each of the following statement describes a force acting. Which force is causing work to be done?
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Is power a scalar quantity?
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
Fill in the boxe to show the corresponding energy transformation.
