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प्रश्न
What is power?
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उत्तर
Power is the rate of doing work or the rate of transfer of energy. If W is the amount of work done in time t, then power is given by the expression,
The rate of doing work or energy conversion rate is called power.
Power = `"Work" /"time"`
or P = `W/t`
Where, P = Power
w = Work
t = Time
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संबंधित प्रश्न
Define 1 watt of power.
Define average power.
Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to 10 m/s?
Define kilowatt-hour.
A body does 1200 joules of work in 2 minutes. Calculate its power.
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much work does he do in lifting one box?
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)
