Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 18 - Electric Currents - Questions: 11

Answer

The 100 W bulb draws more current. The 75 W bulb has more resistance.

Work Step by Step

Assuming that both lightbulbs are used at the same voltage, the power equation P = IV shows that the higher-power 100 W bulb draws more current. Using the power equation $P=\frac{V^{2}}{R}$, we see that the lower-power 75 W bulb has a higher resistance, which makes sense because it draws less current.
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