Which of the following devices does NOT rely upon the principles of electromagnetism to function?

A) Solenoid
B) Headlight
C) Relay
D) Ignition coil

Electromagnetism

A branch of physics that studies the interaction between electric currents and magnetic fields.

Solenoid

A coil of wire that acts as a magnet when carrying electric current, often used to control a valve or other components by moving a ferromagnetic core.

Relay

An electrical switch that opens and closes circuits electromechanically or electronically, often used for controlling a high-power circuit with a low-power signal.