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Moderated by the voltage regulator, system voltage during regular car operation is around ____.

A 15 volts
Normally, the system voltage is around 14.5 volts. Car accessories increase the demand on the system (dropping the voltage) but this is compensated by the voltage regulator, which increases the alternator's output until the system voltage is back to approximately 15.
B 10 volts
C 20 volts
D 25 volts