What variable produces speed on the disk of a watt-hour meter?

The speed on the disk of a watt-hour meter is primarily produced by the voltage applied to the meter. In a watt-hour meter, the amount of energy consumed is calculated based on the power, which is a product of voltage and current. When voltage is applied to the load, it creates a flow of current that interacts with the magnetic field inside the meter. This interaction causes the disk to rotate, and the speed of that rotation is directly proportional to the amount of electrical energy being consumed.

The relationship between voltage and the speed of the disk is critical because the watt-hour meter is designed to measure energy over time, making voltage a key factor in determining how quickly the disk spins. Higher voltage typically results in increased current flow, thus leading to a greater speed on the disk, which corresponds to more energy consumption being recorded.

While other factors like resistance, frequency, and capacitance may influence electrical circuits in different contexts, they do not directly determine the speed of the disk in a watt-hour meter. Resistance affects the flow of current, frequency relates to alternating current cycles, and capacitance concerns energy storage in circuits. However, none of these variables directly correlate to the rotational speed of the meter's disk in the way that voltage does.