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Back to 19.7 Energy Stored in Capacitors

Unreasonable Results

Avg difficulty 2.5

(a) On a particular day, it takes 9.60 × 10 3 J 9.60 \times \text{10}^{\text{3}} \text{J} of electric energy to start a truck’s engine. Calculate the capacitance of a capacitor that could store that amount of energy at 12.0 V. (b) What is unreasonable about this result? (c) Which assumptions are responsible?

OpenStax College Physics 2e, 19.7 Energy Stored in Capacitors, exercise 18

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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.