When switch S in the figure is open, the voltmeter V of the battery reads 3.08V

Question

When switch S in the figure is open, the voltmeter V of the battery reads 3.08V . When the switch is closed, the voltmeter reading drops to 2.90V , and the ammeter A reads 1.62A . Assume that the two meters are ideal, so they do not affect the circuit. Find the emf E.

When switch S in the figure is open, the voltmeter V of the battery reads 3.08V . When the switch is closed, the voltmeter reading drops to 2.90V , and the ammeter A reads 1.62A . Assume that the two meters are ideal, so they do not affect the circuit. Find the emf E.

Explanation / Answer

since the ammeter and voltameter are ideal =>voltameter has infinite resistance and ammeter has zero resistance

So when switch is open no current is flowing in the system(voltameter has infinite resistance)

Therefore E=voltameter reading when the switch is open

E=3.08V

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