Question

what does an electricity meter do?

Answer 1

Electric meter is an instrument that measures the amount of electric energy used in a particular place like home or office. The meter is measured in kilowatt-hours. It is generally designed for use with alternating current. Electric meters use circuits that produce electrical signals whose frequency or strength is proportional to the voltage and current being used. These signals are converted into energy measurements recorded by mechanical or electronic indicators.

Hope this clarifies your idea the purpose of electric meter.