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Resistors are basic passive electronic components used to limit current and lower voltage within circuits. They dissipate extra electric energy in the form of heat following Ohm's law.

Besides current‑limiting, resistors work for voltage division, signal attenuation and circuit biasing. Typical types contain carbon‑film, metal‑film and wire‑wound resistors.

Crucial parameters include resistance value, power rating and tolerance. High‑precision resistors provide stable performance for sensitive circuits.

Found in nearly all electronic products. They cooperate with capacitors and inductors to keep circuits running safely and properly from simple boards to complex integrated‑circuit systems.