Q.14) Define power. State commercial unit and SI unit of electrical energy.
An electric heater of 400 W works for 2 hours.Find the electrical
energy units consumed in a day
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Explanation:
hi there! Power is defined as the rate at which work is done upon an object. S.I. Unit of electrical energy is Joule. kwh is the commercial until of energy.
hope it helps you friend
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power is defined as work done by system/total time taken it will give us a idea about in 1 sec how much work will it do,
so
power=work/time taken
put work in joules and time in seconds.
it's s.i.unit is w(watt)
so in question 400=work/2×60(time in second)
work=48000 joule it's same as electric energy (reason is work done by system using current is electrical energy)
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