What is the primary function of a magneto?

The primary function of a magneto is to produce high voltage for the spark plug. Magnetos are essential components in ignition systems, especially in aircraft engines and some small-engine applications. They generate electrical energy independently of the aircraft's electrical system, meaning they can provide reliable spark for ignition even if the aircraft's battery or other electrical systems fail.

When the engine is running, magnets rotate around coil windings in the magneto, generating alternating current (AC) which is then transformed into high-voltage direct current (DC) to create a spark. This spark ignites the air-fuel mixture in the engine's cylinders, which is critical for engine operation.

Understanding this function highlights the importance of the ignition system in engine performance. Other choices relate to different aspects of engine operation but do not reflect the magneto's role in generating the necessary spark to start combustion.