Back to 21.4 DC Voltmeters and Ammeters

Unreasonable Results

Avg difficulty 2.5

(a) What resistance would you put in parallel with a 40.0-Ω\text{40} . 0-Ω galvanometer having a 25.0-μA\text{25}. 0-μA sensitivity to allow it to be used as an ammeter that has a full-scale deflection for 10.0-μA\text{10} . 0-μA? (b) What is unreasonable about this result? (c) Which assumptions are responsible?

OpenStax College Physics 2e, 21.4 DC Voltmeters and Ammeters, exercise 20

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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.