Energy Stored on a Capacitor

  • Thread starter Strawberry
  • Start date
  • #1
Strawberry
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Homework Statement


Q18. A 20 F capacitor is charged to 200 V. Its stored energy is:
C. 0.4 J


Homework Equations


q = CV
u = .5CV^2


The Attempt at a Solution


I tried plugging in the numbers and got 1.6E6, which isn't even close to the answer. I really don't know where to go with this one. I even went and found an energy calculator online and it came up with the same answer I got. Is stored energy not the potential energy of the capacitor?
 

Answers and Replies

  • #2
alphysicist
Homework Helper
2,238
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Hi Strawberry,

Are you sure the capacitance wasn't [itex]20 \mbox{ }\mu F[/itex]? Most capacitors that I've dealt with in problems are in that range, and that would also give the answer you are given.
 
  • #3
Strawberry
21
0
I guess the symbol just didn't show up in the .pdf. Thanks again alphysicist, you've cleared up a ton of things for me in the past few weeks.
 
  • #4
alphysicist
Homework Helper
2,238
2
Sure, I'm glad I could help!
 

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