## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# 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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