Electric Power

Electric power

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