An inductor opposes any change in what?

An inductor is a passive electrical component that stores energy in a magnetic field when current flows through it. The fundamental property of an inductor is its ability to oppose changes in current. This behavior is derived from Lenz's Law, which states that the direction of induced current will oppose the change in magnetic flux that created it. Therefore, if the current through an inductor increases or decreases, the inductor will generate a voltage that tries to counteract that change, maintaining a constant current flow as much as possible.

The other options—voltage, resistance, and frequency—do not accurately describe what an inductor opposes. An inductor does not oppose voltage directly; it responds to changes in current, which are associated with changes in voltage according to Ohm's Law. Resistance is a measure of how much a material opposes current flow, while frequency relates to the rate of oscillation or cycles in an alternating current circuit. Thus, the defining characteristic of an inductor lies in its opposition to changes in current, making it a critical component in many electronic circuits to manage and stabilize current flow.