Conceptual Physics (12th Edition)

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

Chapter 23 - Think and Explain: 101

Answer

Line current decreases. Line current increases.

Work Step by Step

Ohm's Law states that the current through a resistive circuit depends on the voltage, divided by the overall resistance. $$Current = \frac{voltage}{resistance}$$ As more devices are connected in series, the overall circuit resistance is increased, so the current goes down, as predicted by Ohm's Law. As more devices are connected in parallel, the overall circuit resistance is decreased, so the current goes up, as predicted by Ohm's Law. The answers differ because the wiring of the circuits is different.
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