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 552: 14

Answer

Another resistor may be wired/soldered in parallel with the 480 ohm resistor to lower the overall resistance, i.e., to make the equivalent resistance equal to 350 ohms.

Work Step by Step

When resistors are wired in parallel, we use equation 19–4 to find the equivalent resistance. $$\frac{1}{R_{eq}}=\frac{1}{350\Omega}=\frac{1}{480\Omega}+\frac{1}{R}$$ $$R=1292\Omega\approx 1300\Omega$$ We should solder a $1300\Omega$ resistor in parallel with the $480\Omega$ resistor.
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