ASVAB Automotive Information Practice Test 374001

Question 1 of 5

Once the engine is running, the alternator provides electrical current to recharge the battery and power the electrical system. The alternator is driven by the engine's crankshaft and produces alternating current (AC) which is then fed through a rectifier bridge to convert it to the direct current (DC) required by the electrical system. A voltage regulator controls the output of the alternator to maintain a consistent voltage (approx. 14.5 volts) in the electrical system regardless of load.

What is the function of the alternator?

replaces the electrical energy that the car draws from the battery

provides AC power for the car's electrical components

charges the battery when the car is not running

converts motion from the wheels into DC power