Inductor
How an inductor stores energy in a magnetic field, why it resists changes in current, and where inductance is useful rather than a nuisance.
Questions people ask
Why does an inductor pass DC but block high frequencies?
Its reactance is 2πfL, which is zero at DC and rises with frequency. To a steady current it is just a piece of wire.
What is a choke?
An inductor used specifically to block AC or noise while letting DC through — the name describes the job rather than the part.
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Last updated 22 August 2026