Rate at which electric energy is dissipated or consumed in a circuit is called Electric Power.
P = VI = I2R = V2/R
- SI unit of Power is Watt (W).
- 1 Watt power is consumed when 1 Ampere of current flows through a device at a potential difference of 1 Volt.
- Electrical energy is the amount of work done or energy consumed in a given amount of time. So, it is measured in Joules or Wh (watt hour) or most commonly as kWh (Kilowatt hour).
- 1 kWh = 3.6 x 106 Joule (J)