The measure of which electrical characteristic opposes current flow due to changes in voltage is called what?

The measure of the electrical characteristic that opposes current flow due to changes in voltage is known as inductance. This property is exhibited by inductors, which store energy in a magnetic field when current passes through them. When there’s a change in the current flowing through an inductor, it induces a voltage that opposes the change, embodying Lenz's Law.

Inductance is crucial in AC circuits where it's essential to understand how current and voltage interact; for instance, inductors react to changes in current rather than remaining constant like resistors would. This behavior makes inductance particularly important in circuits where current flow needs to be controlled in response to rapid changes in voltage, such as in tuning circuits or transformers.

Other characteristics like resistance and reactance also play crucial roles but are defined differently. Resistance directly opposes current regardless of the voltage changes, while reactance encapsulates both capacitive and inductive effects in alternating current circuits.