When the switch S in the figure at right is open, the voltmeter reads 3.15 V. Wh

Question

When the switch S in the figure at right is open, the voltmeter reads 3.15 V. When the switch is closed, the voltmeter reads 2.95 V and ammeter reads 2.5 A. Find (a) the emf of the battery, (b) the internal resistance of the battery, and (c ) the value of the resistor R. Given the circuit shown when the resistors are 1 k ohm, 2k ohm, 3k ohm, and 4k ohm, respectively, and the emf 6V. Find the voltage across and the current through each resistor. Given the figure shown at right with V = 9V, (a) If the switch is open. find Ved. If the switch is closed, find V.

Explanation / Answer

when switch is open voltmeter reading is equal to emf of the battery EMf of battery E= 3.15v when switch is closed V= E-ir 2.95 = 3.15 - 2.5r r =0.08 and i =E/R+r 2.5 = 3.15 /R+0.08 R+0.08 = 1.26 R = 1.18

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