Physics · University
Stored energy in an ideal capacitor · formula reference
Convert microfarads to farads before using SI units. This is a paper exercise, not hardware guidance.
Formula
Convert microfarads to farads before using SI units. This is a paper exercise, not hardware guidance.
U = CV²/2
Worked example
An ideal capacitor of 376 μF is at 9 V. Calculate its stored energy in millijoules. Round the final result to 4 decimal places if needed. Answer in mJ.
U = (376 × 10⁻⁶)(9)²/2 J. Multiply joules by 1000 for mJ.
15.228 mJ
Prerequisites and checking
Algebra, calculus and the stated physical model. Keep units and rounding consistent. State the model conditions before applying the formula.
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
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