https://electronics.stackexchange.c...h-current-load-from-a-moderate-current-source

The circuit has a burst current of 20A @ 12V for 5 seconds with a 1V drop, calculate the required capacitance?

I get the 2V * 20A * 5s = 1200 Joules, but the formula below that one makes no sense to me. I've tried to calculate it over and over and I get .724Farads, not 104Farads like the answer on Stackex. What am I doing wrong?

My attempt at a solution:

C/2 (12^2-11^2)V^2 =1200

(2) C/2 (12^2 -11^2) V^2 = 1200(2)

C(12^2-11^2)V^2=2400

C(144-121)V^2=2400

C(23)V^2=2400

C23(144) =2400

C(3312) =2400

C(3312)/ 3312= 2400/3312 = .724 F

I've been racking my brain so much I've only confused myself further, any help will be greatly appreciated.