Discussion
Which battery serves the low voltage systems on an electric vehicle?
Answer: B
A direct current converter charges an ordinary twelve volt battery that runs the lights, controllers and contactors. A flat twelve volt battery immobilises an electric vehicle completely, which surprises many owners. Resistor networks would be hopelessly inefficient. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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