What is a key characteristic of AC ignition systems?

AC ignition systems are distinct in that they generate voltage through the motion of the engine, without relying on a battery for power. This characteristic is particularly important in applications where weight and simplicity are crucial, such as in smaller engines found in lawn equipment or certain motorcycles. The ability to generate voltage independently allows these systems to ignite the fuel-air mixture effectively, aligning with the operational demands of the engine.

The reliance on engine motion rather than a stable battery distinguishes AC systems from DC ignition systems, which do depend on battery power. This feature contributes to a design that can be lighter and less complex, making it suitable for specific applications where space and weight constraints are a concern.