When switch S in the figure is open, the voltmeter V of the battery reads 3.11 V

Question

When switch S in the figure is open, the voltmeter V of the battery reads 3.11V . When the switch is closed, the voltmeter reading drops to 3.00V , and the ammeter A reads1.65A . Assume that the two meters are ideal, so they do not affect the circuit.

When switch S in the figure is open, the voltmeter V of the battery reads 3.11V . When the switch is closed, the voltmeter reading drops to 3.00V , and the ammeter A reads1.65A . Assume that the two meters are ideal, so they do not affect the circuit. Find the emf E. Express your answer in volts to three significant digits.

Explanation / Answer

esistors in series are simply added together. Using Ohm's Law (R = V / I), the overall resistance in the circuit would be:
R + r = 3.08 / 1.64. You know that r = 0.0717 ohms. Solve for R.

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