Answer
$r=5.3\Omega$
$E=11V$
Work Step by Step
$I_1r+V_1=E$
$\frac{V_1}{R_1}r+V_1=E$
$\frac{9.7V}{35\Omega}r+9.7V=E$
$I_2r+V_2=E$
$\frac{V_2}{R_2}r+V_2=E$
$\frac{8.1V}{14\Omega}r+8.1V=E$
$\frac{9.7V}{35\Omega}r+9.7V=E$
$r=5.3\Omega$
$E=11V$
Physics: Principles with Applications (7th Edition)
by Giancoli, Douglas C.
Published by
Pearson
ISBN 10:
0-32162-592-7
ISBN 13:
978-0-32162-592-2
Chapter 19 - DC Circuits - Problems - Page 555: 66
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