Which measurement indicates the rate of flow of electric charge in a circuit?

The measurement that indicates the rate of flow of electric charge in a circuit is current. Current is expressed in amperes (A) and represents how much electric charge passes a point in the circuit over a period of time. It essentially quantifies the movement of electrons through a conductor; the more electrons that flow, the higher the current.

Understanding current is fundamental in electronics because it directly influences how devices function. For instance, in a simple electrical circuit, if you increase the current flowing through the circuit, you may increase the brightness of a light bulb connected within that circuit, assuming the voltage remains constant.

Voltage, on the other hand, measures the electric potential difference between two points in a circuit, but does not directly indicate the flow of charge. Resistance characterizes how much a material opposes the flow of electric current, and power relates to the rate at which energy is consumed or produced in a circuit, often calculated as the product of voltage and current. Each of these measurements plays a distinct role in understanding electrical circuits, but current specifically focuses on the flow of charge.