Correct answer
In series.
For the bus's electrical system to run on 24 volts, the two 12-volt batteries must be connected in series. In a series connection, the voltages of both batteries add together, providing the total voltage required (12V + 12V = 24V). If they were connected in parallel, the voltage would remain at 12V, which would not be enough for the bus's electrical system. It is not correct to say that they can be connected either in series or in parallel indiscriminately, since only a series connection guarantees the correct voltage. This type of connection is common in heavy vehicles such as buses and lorries, which require higher-power electrical systems.
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In parallel.
In series.
Either in series or in parallel indiscriminately, provided they have the same capacity.
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