The purpose of an ignition system is to provide a spark at the:

The primary function of an ignition system in an internal combustion engine is to generate a spark at the precise moment necessary to ignite the air-fuel mixture within the combustion chamber. Timing is crucial in this process because an early or late spark can lead to inefficiencies, reduced power output, or even engine damage. By ensuring that the spark occurs at the optimal point in the engine's cycle, the ignition system enhances the engine's performance, efficiency, and overall reliability.

In contrast, generating a spark at random moments would not allow for proper combustion, leading to misfires or failure to start. Load capacity and charging system do not relate to the ignition system's primary function, as they pertain to the battery and electrical components of the engine rather than the ignition process itself.