ASVAB (Armed Services Vocational Aptitude Battery)Electronics Information (EI)Easy
Which of the following is the primary function of an inductor in an AC circuit?
- ATo block DC current
- BTo store electrical charge
- CTo convert AC to DC
- DTo oppose changes in current
Show answer & explanationAnswer & explanation
Correct answer: D. To oppose changes in current
An inductor's primary function is to oppose changes in the current flowing through it, which it does by generating a back electromotive force (EMF). This property is due to its magnetic field.
Why the other options are wrong
- A. Inductors pass DC current with only the resistance of their wire, but they do not block it; capacitors block DC.
- B. This is the function of a capacitor.
- C. This is the function of a rectifier circuit, often using diodes.
Inductor Function
An inductor is a passive electrical component that stores energy in a magnetic field when electric current flows through it, and its primary function is to oppose changes in current.
- Opposes changes in current flow.
- Stores energy in a magnetic field.
- Measured in Henries (H).
Memory trick: Inductors Insist on Inertia of Current.