Electric power is basically amount of Electric Energy used in a particular span of time. It is measured in watts.
Electric Power (watts) = Electrical Energy (Joule)/Time (Second)
Ø If a device consume 1 Joule of energy in one second then power is 1 Watt.
As Power = 1 (joule)/1 (second) =1 Watt
So it’s clear Power is measure of energy per unit time like a second, it’s better to say Watt rather than joule/second.
Another definition:
Electric Power is product of Voltage (V) supplied to a device and Current(A) drawn by the device.
Electric Power (watts) = Voltage * Current
P = V*I
Let’s take an Example:-
· Consider a Motor is feed with 220V supply and it draws 10A of load then what is Power of Motor?
Solution: Here Voltage (V) = 220V
Current (I) = 10A
So Power = V*I
= 220*10 = 2200 Watt
Since 1 KW = 1000W
Then 2200 Watt = 2200/1000 = 2.2KW
So Motor Power= 2.2KW Answer
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