Which of the following best defines 'current' in electrical terms?

In electrical terms, 'current' is best defined as the rate of flow of electric charge. This definition encapsulates the concept that current measures how quickly electric charge is moving through a conductor, such as a wire. Current is typically measured in amperes (A), which indicates how much charge passes through a given point in a circuit per unit of time.

The focus on the flow of electric charge highlights its essential role in electrical systems, where this flow is crucial for the operation of electrical devices and circuits. Understanding current is fundamental for evaluating circuit performance, troubleshooting, and ensuring the safe operation of electrical systems.

In contrast, the other options represent different electrical principles. Voltage across a resistor refers to the electric potential difference that drives current through the resistor but does not define current itself. The intensity of an electric field relates to the force exerted on a charge in that field, while resistance is a measure of how much a material opposes the flow of current. Each of these concepts plays a vital role in understanding electricity but does not capture the essence of what current is.