Vab V A a b r = 2 0, E = 12 V
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Figure shows a source (a battery) with emf E = 12 V and internal
resistance r = 2 Ω. (For comparison, the internal resistance of a
commercial 12 V lead storage battery is only a few thousandths of an
ohm.) The wires to the left of a and to the right of the ammeter A are
not connected to anything. Determine the respective readings Vab and I
of the idealized voltmeter V and the idealized ammeter A.
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