Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 23 - Think and Solve: 42

Answer

There is no effect in either case.

Work Step by Step

$$Current = \frac{voltage}{resistance}$$ $$I = \frac{V}{R} = \frac{2 \; V}{2 \; R} = \frac{0.5\; V}{0.5 \; R} $$ If both voltage and resistance are changed by the same factor, the factor cancels out and the current is unchanged.
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