Electric power is defined as the rate at which electric energy is transferred across an electric circuit per unit time.
It is a scalar quantity, i.e., it has magnitude only but no particular direction.
The mathematical expression for electric power is , where represents electric power, is the voltage across the circuit, is the current flowing across the circuit.
An illustrative diagram of an electric circuit carrying electrical energy is given below.
Step 2: SI unit of electric power
Watt or joule per second is the SI unit of electrical power.