What is the voltage of a single 12-volt battery mentioned in the series?

• A. 12 V
• B. 24 V
• C. 120 V
• D. 6 V

Answer: (A)

The key idea is that the voltage of a single battery is just its rated value. A 12-volt battery provides 12 volts across its terminals. In a series connection, those voltages add up, so two 12 V batteries in series give 24 V, ten in series give 120 V, and so on. Since this question asks for the voltage of one battery, the correct value is 12 V. The other numbers represent the total voltage when multiple batteries are placed in series, not the rating of a single battery.