ASVAB · Cooling, Lubrication, and Electrical

What component recharges the vehicle's battery and powers electrical systems while the engine runs?

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Correct answer

The alternator

A The starter
B The alternator
C The radiator
D The muffler

Why this is the answer

The alternator generates electricity while the engine runs, recharging the battery and powering the vehicle's electrical systems (lights, ignition, accessories). It is driven by a belt from the engine and converts mechanical energy into electrical energy. The battery, by contrast, provides the initial power to start the engine and stores energy; the starter is the motor that cranks the engine to start it. A failing alternator leads to a dead battery and electrical problems even though the battery itself may be fine. Distinguishing the alternator (charges) from the starter (cranks) and battery (stores) is common content.

Source: ASVAB Auto Information — Alternator

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About this topic: Cooling, Lubrication, and Electrical

Cooling, lubrication and electrical questions cover the radiator, thermostat and coolant; engine oil and the oil pump; and the battery, alternator and starter. Overheating and a dead battery are the two scenarios tested most. This is one of 8 Auto Information questions on cooling, lubrication, and electrical, each with a full explanation on a single study page.

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What component recharges the vehicle's battery and powers electrical systems while the engine runs?

Why this is the answer

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About this topic: Cooling, Lubrication, and Electrical

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