How Do You Calculate the Capacitance of a Charged Capacitor?

[xswtxoj]

Homework Statement

A capacitor is in this device is charged 6.10KV and stores 1140 J of energy. What's the capacitance?

Homework Equations

W= 1/2 Q Delta V

The Attempt at a Solution

PE is W
W= 1140 J
Delta V: 6.10 KV
Q =?
C=?

Delta V = -W/Q rewrite to Q= -W/Delta V
convert kV to V
Q= -1140/6100V= -.18

then C= Q/V -.18/6100= -3.06E -5

 

[skeptic2]

Inasmuch as you're given energy (Joules) would you happen to know a formula for finding capacitance from voltage and energy? (hint: The formula is usually written for finding energy from voltage and capacitance.)

 

[xswtxoj]

if C= Q/V is what your saying, C and Q isn't given in this case there only V.

 

[LowlyPion]

http://en.wikipedia.org/wiki/Capacitor#Energy_storage