An inductor is a passive electronic component, usually a coil of wire, that stores energy in a magnetic field when current flows through it. It resists rapid changes in current, which makes it useful in power supplies, filters, oscillators, and RF circuits. In normal operation, an inductor helps smooth electrical noise and stabilize voltage.
In cyber security, inductors matter because they sit in the power path of many devices and can expose physical side effects. Rapid current changes can make an inductor vibrate, producing coil whine or other measurable emissions. Attackers may study those emissions as a side channel, while defenders may use the same behavior to spot unusual load patterns, unstable hardware, or tampering in power circuitry. Because inductors can translate electrical activity into acoustic or electromagnetic clues, they are relevant to both attack analysis and hardware monitoring.