calculations of capacitance

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Original poster: "James Howells" <james@xxxxxxxxxxxxxxxxxxxxxxx>

I don't know why but I have got myself completely flummoxed trying to 
work out a primary cap from the components I have at hand

I don't have enough capacitors of the same value to do a normal MMC 
and want to mix and match what I have got But I have got myself in a 
real error loop


Say I have 6 caps at   1nF and voltage rated at  6KV
I put them in series then add( in series) a 10nF capacitor but only 2KV
I know I don't get 32 Kv rating ..but what do I get ?

I have worked out the total capacity  1/ total =   1/c1+ 1/c2+ 1/c3 
.............
and got two different answers

1/10+ 1/1 ..................1/1       = 1/    .1 + 
6      =  6.1    invert for total cap =    .16nF


OR
                   adding all the numerators and denominators  you 
get    7/16   =  invert to give TOTAL =  2.28nF

I really have confused my self


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James
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