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OpenStudy (anonymous):

C. Four 12-V batteries, combined to produce a total of 48 volts of potential, running the heating system. (On a warm day, it might reach 60°F on Mars!) This circuit needs a circuit breaker, represented as a resistor. So put one in. What is the voltage difference across the heater? If the heater has a 12 Ω resistance, how much current goes through it?

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