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प्रश्न
Name the physical quantity whose unit is watt.
उत्तर
Power is the physical quantity whose SI unit is watt. Power is defined as rate of doing work.
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संबंधित प्रश्न
Define 1 watt of power.
A battery lights a bulb. Describe the energy changes involved in the process.
Find the energy in joules consumed in 10 hours by four devices of power 500 W each.
A body of mass 100 kg is lifted up by 10 m. Find :
(i) the amount of work done
(ii) potential energy of the body at that height (value of g = 10 m/s2)
Define kilowatt-hour.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : work done by the car.
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)
Which one of the following statements about power stations is not true?
