How does the ignition coil function in a magneto system?

The ignition coil in a magneto system functions like a transformer. Its primary role is to convert the low voltage generated by the magneto into a high voltage that is necessary to create a spark at the spark plug.

In a magneto system, the coil contains both primary and secondary windings of wire. When the engine is cranked, a magnet passes by the coil, inducing a voltage in the primary winding. This results in a magnetic field being created around the coil. When the current through the primary winding is suddenly interrupted, the magnetic field collapses, inducing a high voltage in the secondary winding, similar to how a transformer works. This high voltage is then sent to the spark plug, where it creates a spark that ignites the air-fuel mixture in the engine's combustion chamber.

This principle is fundamental for understanding how ignition systems work, especially in small engines where magneto ignition is commonly used. The other options do not accurately describe the function of the ignition coil in this context, as they refer to different electrical components or functions unrelated to the operation of a magneto.