What device on a kilowatt-hour meter counts the revolution of the rotating element?

The register on a kilowatt-hour meter is the component responsible for counting the revolutions of the rotating element, which directly correlates to the amount of electrical energy consumed. The rotating element in the meter turns in response to the flow of electricity, and each complete revolution represents a specific amount of energy usage. This data is captured by the register and translated into measurable kilowatt-hours, which is what consumers are billed for.

In this context, the register can be thought of as the tracking mechanism that translates the mechanical energy of the rotating element into a numerical reading displayed on the meter. This is crucial for accurate billing and monitoring of electricity consumption over time.