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DC CIRCUITS PROBLEMS AND SOLUTIONS

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DC CIRCUITS

DC Circuits Challenge Problems Problem 1: A battery of emf ? has internal resistance iR , and let us suppose that it can provide the emf to a total charge Q before it expires. Suppose that it is connected by wires with negligible resistance to an external (load) with resistance LR . a) What is the current in the circuit? b) What value of LR maximizes the current extracted from the battery, and how much chemical energy is generated in the battery before it expires? c) What value of LR maximizes the total power delivered to the load, and how much energy is delivered to the load before it expires? How does this compare to the energy generated in the battery before it expires?

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