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1. A moving-coil instrument gives f.s.d. for a cur- rent of 10 mA. Neglecting the resistance of the instrument, calculate the approximate value of series resistance needed to enable the instru- ment to measure up to (a) 20 V, (b) 100 V, (c) 250 V.

1. A moving-coil instrument gives f.s.d. for a cur- rent of 10 mA. Neglecting the resistance of the instrument, calculate the approximate value of series resistance needed to enable the instru- ment to measure up to (a) 20 V, (b) 100 V, (c) 250 V.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Practice Exercise 57 Shunts and multipliers (Answers on page 820) 1. A moving-coil instrument gives f.s.d. for a cur- rent of 10 mA. Neglecting the resistance of the instrument, calculate the approximate value of series resistance needed to enable the instru- ment to measure up to (a) 20 V, (b) 100 V, (c) 250 V. 2. A meter of resistance 50 2 has an f.s.d. of 4 mA. Determine the value of shunt resistance required in order that f.s.d. should be (a) 15 mA, (b) 20 A, (c) 100 A. 3. A moving-coil instrument having a resistance of 20 2 gives an f.s.d. when the current is 5 mA. Calculate the value of the multiplier to be con- nected in series with the instrument so that it can be used as a voltmeter for measuring p.d.s up to 200 V. 4. A moving-coil instrument has a f.s.d. of 20 mA and a resistance of 25 2. Calculate the values of resistance required to enable the instrument to be used (a) as a 0–10 A ammeter, and (b) as a 0-100 V voltmeter. State the mode ofresistance connection in each case.
Transcribed Image Text:Practice Exercise 57 Shunts and multipliers (Answers on page 820) 1. A moving-coil instrument gives f.s.d. for a cur- rent of 10 mA. Neglecting the resistance of the instrument, calculate the approximate value of series resistance needed to enable the instru- ment to measure up to (a) 20 V, (b) 100 V, (c) 250 V. 2. A meter of resistance 50 2 has an f.s.d. of 4 mA. Determine the value of shunt resistance required in order that f.s.d. should be (a) 15 mA, (b) 20 A, (c) 100 A. 3. A moving-coil instrument having a resistance of 20 2 gives an f.s.d. when the current is 5 mA. Calculate the value of the multiplier to be con- nected in series with the instrument so that it can be used as a voltmeter for measuring p.d.s up to 200 V. 4. A moving-coil instrument has a f.s.d. of 20 mA and a resistance of 25 2. Calculate the values of resistance required to enable the instrument to be used (a) as a 0–10 A ammeter, and (b) as a 0-100 V voltmeter. State the mode ofresistance connection in each case.
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