Solving Energy Problems: Understanding Capacitors and Voltage

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SUMMARY

The discussion focuses on solving energy problems involving capacitors and voltage using the equations Q = CV, E = Q²/(2C), and E = 1/2 * C * V². A common misconception addressed is the assumption that all capacitors are in parallel, which leads to incorrect calculations. Participants are advised to redraw the circuit to accurately identify the series and parallel combinations of capacitors to determine the correct energy values.

PREREQUISITES
  • Understanding of capacitor configurations (series and parallel)
  • Familiarity with the equations for capacitance and energy storage
  • Basic circuit analysis skills
  • Knowledge of electrical units (voltage, capacitance, energy)
NEXT STEPS
  • Study the principles of series and parallel circuits in capacitors
  • Learn how to apply the equations Q = CV and E = 1/2 * C * V² in practical scenarios
  • Explore circuit simulation tools to visualize capacitor arrangements
  • Investigate common mistakes in capacitor calculations and how to avoid them
USEFUL FOR

Students studying electrical engineering, educators teaching circuit theory, and anyone looking to deepen their understanding of capacitors and energy calculations in electrical circuits.

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Homework Equations


Q = CV
E = Q2/(2C)
E = 1/2*C*V2


I thought since they were parallel the voltage across each was the same so E = 1/2*36*106*302 but that gives me .0162 and that's not an option, .0016 is
 
Last edited by a moderator:
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xpack said:
I thought since they were parallel the voltage across each was the same
They are not all in parallel. Hint: Redraw the circuit to identify the parallel/series combinations.
 

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