# If I have two identical capacitors and I connected them in series/parallel what would happen? Answered

Take 10,000uF and 100v, Does that double the voltage or the capacitance? I want to end up with a capacitor bank of around 400v with a capacitance of minimum 8,000uF. So what I'm getting at is what can i change around in terms of capacitors and to what effect. Thanks : D

• BTW, I'm going for a coilgun here

EDIT:
• Also, if i'm building a capacitor bank for a coilgun, would i be going for the max capacitance or the max voltage?
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## Comments

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if you put them in series, you'll get double the voltage, but 1/4 the capacitance - because they interfere with each other. If you put them in parallel you'll get twice the capacitance and 1:1 on the voltage. Why does the capacitance go down? because a capacitor as it charges starts to resist the flow of power thru it. When fully charged, there is no flow because the internal voltage directly opposes the input. 2 in series kind of cancel one another out - but since there are 2 you can handle twice the voltage (half each)