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# Another capacitor question, this one involving joules, how many caps would make 1 joule?

If i had some 330v 120uf camera flash capacitors, how many would I need to have 1 joule? Also, whats the formula, so I can figure different thing later and dont have to bug yall. =P

## Discussions

1/2 C x V

^{2}Energy depends on VOLTAGE. if we assume you are charging to maximum V, then In this case, 1= 1/2 x C x 330^2, so you need less than 1 capacitor ! Alternatively, given one cap, what do I charge it to store 1 Joules ?

1= 120 uF/2 x V^2, so V=130 volts.

Steve

Wow, thanks, really helpful