In the illustration, 1, 2, 3 and 4 are 12 volt batteries. What will be the nominal voltage as read by a voltmeter across the output of the battery bank? EL-0107

Correct Answer: Option C — 24 volts

Connecting identical voltage sources in series adds their potential differences while maintaining current capacity. Two 12-volt batteries connected in series string arrangements double the output to 24 volts, a standard shipboard configuration for emergency and control power systems under 46 CFR.