# coil gun\ gaus gun

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#### dstich

##### New Member
what kind of switich could i use to turn on the power from the capaciter and how do i find the curent coming out of the capiciter
thanks for the help

#### ljcox

##### Well-Known Member
Coil gun

A SPDT switch would be suitable. The initial current will depend upon the initial capacitor voltage, the resistance and the inductance. If the L is relatively small, then I = V/R (approx) where V is the capacitor voltage at t = 0 and R is the total series resistance.

If L is significant, then it is more complicated. A circuit simulation program would do it for you if you can't do the maths. If that is not an option, send me a PM and I'll do the maths for you.

Len

#### dstich

##### New Member
sory i meant a electronicly operated switch thanks for the help with the capaciter

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