To determine Find the current through the galvanometer when the bridge is unbalanced by setting R 3 = 3003 Ω in the given circuit of Figure P4.73 using PSPICE. Explanation Given data: The internal resistance of the galvanometer is 50 ohms. Refer to Figure P4.73 in the textbook. Calculation: The given circuit is redrawn as shown in Figure 1 when the bridge is unbalanced by setting R 3 = 3003 Ω and remove the galvanometer to find the Thevenin voltage V Th across the terminals a-b. In Figure 1, the voltage v 1 is calculated by using voltage division rule. v 1 = ( 18 V ) ( 200 Ω 500 Ω + 200 Ω ) = 5.142857 V In Figure 1, the voltage v 2 is calculated by using voltage division rule. v 2 = ( 18 V ) ( 1200 Ω 3003 Ω + 1200 Ω ) = 5.139186 V From Figure 1, the Thevenin voltage is calculated as follows. V Th = v 1 − v 2 = 5.142857 V − 5.139186 V = 3.67 × 10 − 3 V = 3.67 mV { ∵ 1 m = 10 − 3 } In given circuit, the Thevenin resistance is determined by removing the galvanometer and voltage source as short circuit

10th Edition

ISBN: 9780133760033

Author: James W. Nilsson, Susan Riedel

Publisher: PEARSON

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Chapter 4, Problem 73P

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Find the current through the galvanometer when the bridge is unbalanced by setting R3=3003 Ω in the given circuit of Figure P4.73 using PSPICE.

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Chapter 4, Problem 72P

Chapter 4, Problem 74P

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