Which device converts mechanical energy into electrical energy in the vehicle?

• A. Generator
• B. Battery
• C. Alternator
• D. Motor

Answer: (A)

Electrical energy in a vehicle is produced by the alternator. It is driven by the engine through a belt and converts the engine’s mechanical energy into electrical energy as it spins, generating alternating current that is rectified to direct current to charge the battery and power electrical systems while the engine runs. The battery stores energy and provides power when the engine isn’t running or when demand exceeds what the alternator alone can supply. A motor uses electrical energy to produce motion, and a generator is an older term for the device that generates electricity; in modern vehicles the standard term is alternator.