Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 27 - Current and Resistance - Stop to Think 27.4 - Page 752: 1


$I_5 = 1$ Amp inward

Work Step by Step

We must use Kirchoff's junction law, $\Sigma I_{in} = \Sigma I_{out}$ The wires that have 6 and 2 amps are flowing outward, and the 3, 4, and unknown amp wires flow inward. $\therefore$ $3+4+I_5=6+2$ Since $I_5$ is positive, $I_5$ flows inward $I_5 = 1$ Amp
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