Which component charges the battery and powers electrical systems while the engine runs?

Which component charges the battery and powers electrical systems while the engine runs?

• A. Voltage regulator
• B. Alternator
• C. Starter
• D. Battery

Answer: (B)

The alternator is what charges the battery and powers the vehicle’s electrical systems while the engine is running. It’s driven by the engine through a belt, so as the engine runs, the alternator converts mechanical energy into electrical energy. Inside it, a rotor and stator generate alternating current, which is then converted to direct current by diodes to feed the car’s electrical system and recharge the battery. A voltage regulator (usually built into the alternator) keeps the output at a safe level, typically around 13.8 to 14.4 volts, so the battery stays charged without overcharging. The battery stores energy for starting the engine and for electrical accessories when the engine isn’t running, while the starter is the component that uses battery power to crank the engine.

The alternator is what charges the battery and powers the vehicle’s electrical systems while the engine is running. It’s driven by the engine through a belt, so as the engine runs, the alternator converts mechanical energy into electrical energy. Inside it, a rotor and stator generate alternating current, which is then converted to direct current by diodes to feed the car’s electrical system and recharge the battery. A voltage regulator (usually built into the alternator) keeps the output at a safe level, typically around 13.8 to 14.4 volts, so the battery stays charged without overcharging. The battery stores energy for starting the engine and for electrical accessories when the engine isn’t running, while the starter is the component that uses battery power to crank the engine.