Electricity Meter (also called Watt-hour Meter or Energy Meter)​​ is a device that measures the amount of electric energy consumed by a residence, business, or electrically powered equipment. The primary function of an electricity meter is to make an accurate record of the energy expended in a consumer's appliances.

Electricity meters are essential for:

Residential electricity billing

Commercial and industrial energy management

Power system monitoring and control

Energy conservation and efficiency programs 

The evolution from mechanical to electronic meters has significantly improved measurement accuracy, functionality, and

integration capabilities with modern power systems.