(a) Explanation Given data: The current ( i meas ) reads by an ammeter is 6 A. Calculation: PSPICE Simulation: To find the open circuit voltage v oc or Thevenin voltage V Th : Draw the circuit diagram in PSPICE as shown in Figure 1. Save the circuit and provide the Simulation Settings as shown in Figure 2. Now run the simulation and the results will be displayed as shown in Figure 3 by enabling “Enable Bias Voltage Display” icon. From Figure 3, the Thevenin voltage across the terminals a-b is calculated as follows, V Th = 20 V To find the short circuit current i sc or I N : Draw the circuit diagram in PSPICE as shown in Figure 4. Save the circuit and provide the Simulation Settings as shown in Figure 5. Now run the simulation and the results will be displayed as shown in Figure 6 by enabling “Enable Bias Current Display” icon. In Figure 6, consider the current entering to the current controlled current source F1 in PSPICE is − 12 A and is equal to the Norton current. From Figure 6, the short circuit current or Norton current in the terminals a-b is i sc = − 12 A . To find the Thevenin resistance R Th : The Thevenin resistance R Th is calculated by using Ohm’ law. R Th = V Th i sc Substitute − 12 A for i sc and 20 V for V Th to find the Thevenin Resistance R Th in ohms (b) To determine Calculate the percentage of error in the current measurement.

10th Edition

ISBN: 9780133760033

Author: James W. Nilsson, Susan Riedel

Publisher: PEARSON

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Chapter 4, Problem 76P

(a)

To determine

Calculate the resistance of the ammeter when it reads 6 A using PSPICE.

(b)

To determine

Calculate the percentage of error in the current measurement.

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Chapter 4, Problem 75P

Chapter 4, Problem 77P

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