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# Solved: An ideal ammeter is modeled as a short circuit. A more realistic model of an

ISBN: 9781118477502 422

## Solution for problem P5.5-10 Chapter 5.5

Introduction to Electric Circuits | 9th Edition

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Introduction to Electric Circuits | 9th Edition

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Problem P5.5-10

An ideal ammeter is modeled as a short circuit. A more realistic model of an ammeter is a small resistance. Figure P 5.5-10a shows a circuit with an ammeter that measures the current im. In Figure P 5.5-10b, the ammeter is replaced by the model of an ideal ammeter, a short circuit. The ammeter measures imi, the ideal value of im. Ammeter im imi 3 mA 4 k 4 k 2 k im 3 mA 4 k 4 k 4 k 2 k 3 mA 4 k 2 k Rm (a) (b) (c) Figure P 5.5-10 As Rm ! 0, the ammeter becomes an ideal ammeter and im ! imi. When Rm > 0, the ammeter is not ideal and im < imi. The difference between im and imi is a measurement error caused by the fact that the ammeter is not ideal. (a) Determine the value of imi. (b) Express the measurement error that occurs when Rm 20 V as a percentage of imi. (c) Determine the maximum value of Rm required to ensure that the measurement error is smaller than 2 percent of imi. P 5.5-11 Determine values of Rt and isc that cause the circuit shown in Figure P 5.5-11b to be the Norton equivalent circuit of the circuit in Figure P 5.5-11a.

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ENGR 121 B Lecture Notes for 9/19/2016 Spencer Kociba Summary of Lecture: beginning to understand the vocabulary and functions in MATLAB and how we will use MATLAB and BlackBoard Learn to turn in assignments, take quizzes, etc. Goal of the course: learn to THINK like a programmer aka step by step problem solving. Problem solving techniques:...

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##### ISBN: 9781118477502

This textbook survival guide was created for the textbook: Introduction to Electric Circuits, edition: 9. The answer to “An ideal ammeter is modeled as a short circuit. A more realistic model of an ammeter is a small resistance. Figure P 5.5-10a shows a circuit with an ammeter that measures the current im. In Figure P 5.5-10b, the ammeter is replaced by the model of an ideal ammeter, a short circuit. The ammeter measures imi, the ideal value of im. Ammeter im imi 3 mA 4 k 4 k 2 k im 3 mA 4 k 4 k 4 k 2 k 3 mA 4 k 2 k Rm (a) (b) (c) Figure P 5.5-10 As Rm ! 0, the ammeter becomes an ideal ammeter and im ! imi. When Rm > 0, the ammeter is not ideal and im < imi. The difference between im and imi is a measurement error caused by the fact that the ammeter is not ideal. (a) Determine the value of imi. (b) Express the measurement error that occurs when Rm 20 V as a percentage of imi. (c) Determine the maximum value of Rm required to ensure that the measurement error is smaller than 2 percent of imi. P 5.5-11 Determine values of Rt and isc that cause the circuit shown in Figure P 5.5-11b to be the Norton equivalent circuit of the circuit in Figure P 5.5-11a.” is broken down into a number of easy to follow steps, and 216 words. Since the solution to P5.5-10 from 5.5 chapter was answered, more than 255 students have viewed the full step-by-step answer. Introduction to Electric Circuits was written by and is associated to the ISBN: 9781118477502. The full step-by-step solution to problem: P5.5-10 from chapter: 5.5 was answered by , our top Engineering and Tech solution expert on 03/14/18, 07:39PM. This full solution covers the following key subjects: . This expansive textbook survival guide covers 146 chapters, and 1397 solutions.

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