Why doesn't the electric potential constantly decrease in a circuit as the current moves from the positive to the negative terminal?
Details and Assumptions: 1. The wires show no resistance.
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In a normal electric circuit, with copper wires at ambient temperature, electric potential does decrease around the circuit, as there will be some resistance and so there has to be a voltage/potential gradient for the current to flow. Copper wires DO have some resistance, so your assumption is invalid in that case.
However, your assumption would be valid for superconducting wires below their critical temperature. Here, the resistance is zero, which means that you can have a current flowing without needing to have any potential gradient or EMF to push it along.