The potentials of the indicated points are maintained as shown. The voltmeter and ammeter are ideal. Find the potential x of the central junction O and the readings of the voltmeter and ammeter.

Question

G1 Physics · Accepted Answer

Let the central junction potential be x and apply KCL at O. Solving gives x = 4/3 V. The ideal voltmeter then reads 12⅓ V and the ammeter current is 1/15 A. Hence option A.