Wattage

Definition

Electric power, like mechanical power, is the rate of doing work, measured in watts, and represented by the letter P. The term wattage is used colloquially to mean "electric power in watts". The electric power in watts produced by an electric currentI consisting of a charge of Q coulombs every t seconds passing through an electric potential (voltage) difference of V is: $${\displaystyle {\text{Work done per unit time}}=P={\frac {W}{t}}=V\times I}$$ The voltage between two terminals is defined as the work required to move a unit charge from one terminal to the other against the force of the electric field, so this equation can be derived as