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ASVAB · General

What is the purpose of the vehicle's battery?

Correct answer

To store electrical energy, primarily to start the engine and power electronics when the engine is off

  1. A To cool the engine
  2. B To store electrical energy, primarily to start the engine and power electronics when the engine is off
  3. C To lubricate the engine
  4. D To filter fuel

Why this is the answer

The BATTERY stores electrical energy — primarily to provide the power to START the engine (running the starter motor) and to power electronics (lights, radio) when the engine is off. ASVAB Auto Information tests the electrical system. Once the engine runs, the ALTERNATOR takes over powering the car and recharging the battery. A typical car battery is 12 volts. A dead battery is a common cause of no-start. Knowing the battery's purpose (starting the engine, powering electronics, working with the alternator) is commonly tested.
Source: ASVAB Auto Information — Battery

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