How is current calculated in an electrical circuit?

Current in an electrical circuit is calculated using Ohm's Law, which states that current is the result of the voltage supplied across a component divided by the resistance of that component. This relationship can be expressed mathematically as:

Current (I) = Voltage (V) / Resistance (R)

This formula provides a clear understanding of how voltage and resistance interact to determine the flow of electric charge in a circuit. If voltage increases while resistance remains constant, current will increase, and conversely, if resistance increases while voltage remains constant, current will decrease.

While other concepts related to electrical circuits may incorporate voltage, none of the other choices accurately define the relationship as clearly as the correct answer does. For instance, impedance involves an additional aspect of alternating current circuits and does not straightforwardly represent the basic calculation for current as framed by Ohm's Law.