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Back to 21.2 Electromotive Force: Terminal Voltage

21.2 Exercise 16

Avg difficulty 2.5

The hot resistance of a flashlight bulb is 2.30Ω2 . \text{30} \Omega, and it is run by a 1.58-V alkaline cell having a 0.100-Ω0 . \text{100}-\Omega internal resistance. (a) What current flows? (b) Calculate the power supplied to the bulb using I2RbulbI^{2} R_{\text{bulb}}. (c) Is this power the same as calculated using V2Rbulb\frac{V^{2}}{R_{\text{bulb}}}?

OpenStax College Physics 2e, 21.2 Electromotive Force: Terminal Voltage, exercise 16

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.