Going more on the subject of ridiculous.
Given 300V and 100uF
300^2 X .5 X 100 x 10-6
I get 4.5J = 3.3 ftlb
Now. if you dropped a 3.3 lb object (brick like), 1 foot  onto one of 
them teeny, tiny little flash tubes found in the disposable cameras It 
would surely smash into smithereens!!

I guess we'll have to stop taking pictures.

Long ago, I was building a supply for the xenon tube flashlamp for a 
fundus camera that I (and team) was designing - BIG caps, High volts - 
tube not a whole lot bigger than the throw aways -
The stored energy numbers were indeed ridiculous sounding but we got 
lotsa pictures anyway.
-- 

Looking forward,
Al Shinn


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