Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 19 - DC Circuits - Problems - Page 555: 62

Answer

a) Place Galvanometer in parallel with $7.0\times10^{-5}\Omega$ resistor to make ammeter to read currents up to 25A. b) Place Galvanometer in series with $4.5\times10^6\Omega$ resistor to make voltmeter with full scale deflection of 250V.

Work Step by Step

a) $I=I_G+I_R=25A$ $V_R=V_G$ $I_R(R)=I_G(r)$ $(I-I_G)R=I_G(r)$ $(25A-55\mu A)R=(55\mu A)(32\Omega)$ $R=\frac{(55\mu A)(32\Omega)}{(25A-55\mu A)}=7.04\times10^{-5}\Omega$ Place Galvanometer in parallel with $7.0\times10^{-5}\Omega$ resistor to make ammeter to read currents up to 25A. b) $R=\frac{V}{I}=\frac{250V}{55\mu A}=4.5\times10^6\Omega$ Place Galvanometer in series with $4.5\times10^6\Omega$ resistor to make voltmeter with full scale deflection of 250V.
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