Inductors oppose a change in which of the following?

Inductors are components in electrical circuits that store energy in a magnetic field when electrical current passes through them. Their fundamental behavior is based on the principle of electromagnetic induction, which dictates that an inductor opposes changes in current.

When there is a sudden change in the current flowing through an inductor, it generates a voltage that tries to counteract that change. This is due to Lenz's Law, which states that the direction of induced electromotive force (EMF) will always be such that it opposes the change in current that created it. Therefore, an inductor resists changes in the current flowing through it, making it an essential component in various applications such as filters, oscillators, and transformer designs.

The other options do not accurately describe the behavior of inductors. Voltage relates to electric potential and does not inherently dictate the function of an inductor. Frequency pertains to the rate of oscillation in an electrical signal but is not directly opposed by inductors. Resistance relates to the opposition to current flow in a circuit but does not represent what inductors primarily oppose—current itself is the correct focus.