Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Cumulative Review Exercises - Page 1128: 42

Answer

The current when the resistance is $10$ ohms is $11$ Amperes.

Work Step by Step

We have to write the relation between $ I $ and $ R $ as, $\begin{align} & I\propto \frac{1}{R} \\ & I=\frac{k}{R} \end{align}$ Where $ k $ is the constant of proportionality. Put the value of $ R=22$ and $ I=5$ in the equation to get the value of $ k $ as: $\begin{align} & 5=\frac{k}{22} \\ & k=5\cdot 22 \\ & k=110 \end{align}$ So, the equation becomes $ I=\frac{110}{R}$. Then, one has to find the value of $ I $ when $ R $ is $10$ as: $\begin{align} & I=\frac{110}{10} \\ & =11 \end{align}$ Thus, the current when resistance is $10$ ohms is $11$ Amperes.
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