 # What determines the rate at which energy is delivered by a current?

The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which a current delivers energy is the power of the appliance.

## Definition of power

The rate at which work is done or energy is transformed in an electrical circuit.  Electric power is the measure of the rate of electrical energy transfer by an electric circuit per unit of time.

## Features

• Power is denoted by P
• SI Unit is Watt, joule per second

## Formula

Power is generally represented as

P = VI

where,

P is the power

V is the potential difference in the circuit

I am the electric current

Few other ways in which power is represented mathematically are listed below.

• P = I2R
• P = V2/ R
Where,
R is the resistance in the circuit.
V is the potential difference in the circuit
I am the electric current

3 (8) (12) (4)

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