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Back to 23.6 Back Emf

Integrated Concepts

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The motor in a toy car is powered by four batteries in series, which produce a total emf of 6.00 V. The motor draws 3.00 A and develops a 4.50 V back emf at normal speed. Each battery has a 0.100 Ω \text{0}.\text{100 }\Omega internal resistance. What is the resistance of the motor?

OpenStax College Physics 2e, 23.6 Back Emf, exercise 6

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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.