Define power.derive its unit an electric bulb is rated 15 watts.What does it mean?what is the energy consumed in joules,if it is used for 10 mins
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Power= the rate at which electric energy is used in an electric circuit .
This means that the 15 watts is the energy which is delivered by the current
Energy consumed = power × time
=15 W×10 min
=150 W min
This means that the 15 watts is the energy which is delivered by the current
Energy consumed = power × time
=15 W×10 min
=150 W min
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Power is the rate of doing work per time unit
Deriving it's SI unit
work/time.
joules/second=watt
this means that the bulb consumes 15 joules of energy in a second
now ATQ
POWER=15
TIME=60sec
work=?
as we know
power = work /time
so work = 15×60
work done = 900 joules
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