How a Watt-Hour Meter Works

Watt-Hour Meter Picture The standard watt-hour meter is similar to a small electric motor running at a speed proportional to the amount of electrical current passing through it. The motor turns a single rotating disc inside the meter called the "rotor". This disc in turn drives a series of gears that move dials on a register. These dials are what meter readers look at every month to determine the amount of electricity consumed that month.