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

Question

When switch S in the figure is open, the voltmeter V of the battery reads 3.10V . When the switch is closed, the voltmeter reading drops to 2.94V , and the ammeter A reads 1.65A . 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 3.10V . When the switch is closed, the voltmeter reading drops to 2.94V , and the ammeter A reads 1.65A . Assume that the two meters are ideal, so they do not affect the circuit. Find the emf

Explanation / Answer

when the switch is open ,no current flows through the circuit ,so emf is

E=V=3.1 V

b)

r =E-V/I =(3.1-2.94)/1.65

r =0.097 ohms

c)

R=V/I =2.94/1.65

R=1.78 ohms

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