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Back to 21.2 Electromotive Force: Terminal Voltage

21.2 Exercise 2

Avg difficulty 2.5

Calculate the internal resistance of a voltage source if the terminal voltage of the source increases by 1 V when the current supplied decreases by 4 A? Suppose this source is connected in series (in the same direction) to another source with a different voltage but same internal resistance. What will be the total internal resistance? How will the total internal resistance change if the sources are connected in the opposite direction?

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

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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.