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asked Feb 17 in Physics by (2,147m points)
edited Feb 17 by

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answered Feb 17 by (330 points)

It is the total voltage across the two terminals A and B when there is an open circuit between them.

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answered Feb 18 by anonymous

Thevenin's Theorem

 Any combination of batteries and resistances with two terminals can be replaced by a single voltage source e and a single series resistor. The value of e is the open circuit voltage at the terminals, and the value of r is e divided by the current with the terminals short circuited.