To determine Find the voltmeter reading across the terminals A-B of the circuit. Explanation Given data: The internal resistance of the voltmeter is 100 k Ω . Calculation: The given circuit is redrawn as shown in Figure 1. In Figure 1, the voltage source 36 V with series resistance 12 kilo ohms is converted into current source with parallel resistance using source transformation method in Figure 1. That is, The current source = 36 V 12 k Ω = 36 V 12 × 10 3 Ω { ∵ 1 k = 10 3 } = 3 × 10 − 3 A { ∵ 1 A = 1 V 1 Ω } = 3 mA { ∵ 1 m = 10 − 3 } The modified circuit is shown in Figure 2. In Figure 2, the current source 3 mA and 18 mA are in opposite direction. Therefore, the equivalent current source is calculated as follows. The current source = 18 mA − 3 mA = 15 mA In Figure 2, the resistance 12 k Ω and 60 k Ω are connected in parallel. Therefore, the equivalent resistance for the parallel connection is calculated as follows. 12 k Ω | | 60 k Ω = 12 k Ω × 60 k Ω 12 k Ω + 60 k Ω = 10 k Ω Figure 3 shows the reduced circuit diagram

11th Edition

ISBN: 9780134746968

Author: James W. Nilsson, Susan Riedel

Publisher: PEARSON

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Chapter 4.10, Problem 18AP

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Find the voltmeter reading across the terminals A-B of the circuit.

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