When switch S in the figure is open, the voltmeter Vof the battery reads 3.10 V.

Question

When switch S in the figure is open, the voltmeter Vof the battery reads 3.10 V. When the switch isclosed, the voltmeter reading drops to 2.93 V,and the ammeter A reads 1.64 A. Assume that thetwo meters are ideal, so they do not affect the circuit Find the emf . When switch S in the figure is open, the voltmeter Vof the battery reads 3.10 V. When the switch isclosed, the voltmeter reading drops to 2.93 V,and the ammeter A reads 1.64 A. Assume that thetwo meters are ideal, so they do not affect the circuit Find the emf . Find the emf .

Explanation / Answer

lost volts=E-V=ir 3.10-2.93=1.64r so r=internal resistance=0.104ohm hence emf =V+ir=2.93+0.104*1.64=3.101V

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