# Electric Power

The electric power can be defined as the rate at which electric energy is dissipated or consumed in an electric circuit.

P = VI

One watt

It can be defined as the power consumed by a device when one ampere of current is operated at a potential difference of 1V.

1watt = 1 volt Ã— 1 ampere = 1 VA

The SI unit of electric power is watt (W) and it is very small.

1KW = 1000 watt

The electrical energy can be defined as the product of power and time, the unit of energy is watt hour (W h).

One-watt hour

It is the energy consumed when 1 watt of power is used for 1 hour. The commercial unit of electrical energy is kilowatt hour (kWh) and it is commonly known as Unit.

1kW h = 1000 watt Ã— 3600 second

= 3.6 Ã— 106 watt second

= 3.6 Ã— 106 joule (J)