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: 61

Answer

a) Add a $710\Omega$ resistor in series with the ammeter. b) $29\Omega/V$

Work Step by Step

$25V=(35mA)(R_{eq}+R_{ser})$ $R_{eq}=\Big(\frac{1}{0.20\Omega}+\frac{1}{33\Omega}\Big)^{-1}=0.199\Omega$ $R_{ser}=\frac{25V}{35mA}-R_{eq}=714\Omega$ To give a full scale reading of 25V, add a $710\Omega$ resistor in series with the ammeter. Reported sensitivity is equal $\frac{R}{V_{full scale}}=\frac{714\Omega}{25V}=29\Omega/V$
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