In a combustion engine, what does a rectifier do?

A rectifier in a combustion engine, or any electrical system for that matter, serves the function of converting alternating current (AC) to direct current (DC). This is a crucial role because many components within a combustion engine, such as the ignition system, fuel injectors, and electronic control units, typically require DC for proper operation.

In an internal combustion engine, the alternator produces AC electricity when the engine is running. However, since most electrical devices in the vehicle operate on DC, a rectifier is needed to change that AC output into a usable DC format. This conversion is achieved using diodes, which allow current to flow in only one direction, thus effectively turning the AC waveform into a DC signal.

Understanding this function is essential for ensuring reliable electrical operation within the engine's systems, as many modern combustion engines rely heavily on electronic components that mandate a stable DC power supply.