Which component value will change while current is present through all components in a functional circuit?

In a functional circuit, voltage is the component value that will change while current is passing through all associated components. According to Ohm's Law, the voltage across a component is directly proportional to the current flowing through it and the resistance of that component (V = IR). When current flows, if there is any change in the resistance or other factors influencing the circuit, the voltage across the components will adjust accordingly to maintain the relationship dictated by Ohm's Law.

In practical scenarios, especially in AC circuits, as current changes due to varying frequencies or component interactions, the voltage will fluctuate too, adapting to changes in load or circuit configuration. While inductance, capacitive reactance, and resistance are all critical values in determining circuit behavior, they do not change because of the current present; instead, they are intrinsic properties of the components. Voltage, however, is a dependent variable that will respond to the current flowing through the circuit and the characteristics of the circuit components. This makes voltage the correct answer regarding what changes in the presence of current.