An electric energy meter is a meter that measures electric energy. Wherever electricity consumption is measured, it is calculated by an electric energy meter. single phase energy meter is a very good electric energy meter, so let's take a look at its working principle.
A single phase energy meter uses electronic circuits and chips to measure electrical energy. A voltage divider or a voltage transformer is used to turn the voltage signal into a small signal that can be used for electronic measurement. A shunt or current transformer is used to turn the current signal into a small signal that can be used for electronic measurement. Electronically measured small signals, using a dedicated energy measurement chip to perform analog or digital multiplication of the converted voltage and current signals, accumulate the electrical energy and output a pulse signal whose frequency is proportional to the electrical energy. The pulse signal drives the stepping motor to drive the mechanical counter to display or send it to the computer for processing and digital display.
But not all watt-hour meters work the same, mechanical kWh meter .It is slightly different from a single phase energy meter.