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If two voltage source of the same value(20V) are wired in series and they both have different current capacities, could there be any current flow assuming the resistance(internal & circuit) are equal? I assume the voltages being the same and in series to oppose one another they would cancel out regardless of their current capacities?

schematic

simulate this circuit – Schematic created using CircuitLab

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Correct. No voltage drop across the resistor means that no current will flow through it. This is why cells of the same voltage can be placed in parallel with no bad effects.

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