What component transfers battery power to the starter?

The solenoid is a crucial component in the starting system of a vehicle that transfers battery power to the starter. When the ignition key is turned to the "start" position, the solenoid receives a signal from the ignition system. In response, it closes a circuit that allows high current from the battery to flow directly to the starter motor, which then engages and starts the engine.

The function of the solenoid is to act as a switch that controls the flow of electrical current. It ensures that the high power needed to crank the engine is managed efficiently and prevents the battery from being drained unnecessarily.

The other components listed play different roles in the vehicle's electrical system. The alternator is responsible for charging the battery while the engine is running, and the battery stores electrical energy. The ignition system is primarily for starting the engine and managing the fuel-air mixture for combustion but does not directly transfer power to the starter. Understanding the specific function of the solenoid in this process is key to grasping how the starting mechanism works in a vehicle.