Electric Power

What is Electric Power?

Electric power is the time rate of transfer of energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More or time rate of doing work.

Power = \( \frac {Energy \: expended}{time} \\ = \frac{Work \: done}{time} \)

P = \( \frac {IVt}{t} \)

P = IV

But I = \( \frac{V}{R} \)and V = \( \scriptsize IR \)

∴

P = \( \frac {V^2}{R} \)

P = I²R

Electrical power is measured in watts (W) or J/s.

Watt is defined as one jouleJoule is the SI (International System of Units) unit of energy and work. It is equal to the amount of work done when a force of 1 newton displaces a mass... More per second. It is the power that is consumed in an electric circuit when one joule of work is done per second.

Larger units are in Kilowatt and Megawatt.

1 kW = 1000 W