Ignition coils can be described as which device?

• A. Ignition coil
• B. Inductor
• C. Capacitor
• D. Diode

Answer: (A)

Ignition coils rely on electromagnetic induction to generate the high voltage needed for spark plugs. They’re built as a transformer with primary and secondary windings. When current is applied to the primary and then interrupted, the collapsing magnetic field induces a high voltage in the secondary, which is what fires the spark plug. This core behavior—storing energy in a magnetic field and transferring it through windings—defines an inductor, and a specialized transformer is essentially a pair of inductors linked by mutual induction. So, in basic terms, an ignition coil is an inductor (a high‑voltage transformer in practice). It isn’t a capacitor, which stores energy electrostatically, nor a diode, which rectifies current. In the context of identifying the device, the ignition coil itself is the component being described.