# How to calculate a Tesla coil semi spherical top load capacitance?

I want to know if you can calculate the capacitance a Tesla coil semi spherical top load by calculating what it would be then halving it?

Also if that is possible could you third it or quarter it because I am going to buy metal bowls for it and most aren't quite a semi sphere (a lot only go about 120 degrees)?

Also if that is possible could you third it or quarter it because I am going to buy metal bowls for it and most aren't quite a semi sphere (a lot only go about 120 degrees)?

active| newest | oldestSteve

Steve

Maybe test measure it ?

Here's the formula for the capacitance of an isolated charged conducting sphere,

C = 4(pi)e

_{0}RC = capacitance in Farads

pi = 3.14159 ratio of circumference to diameter of a circle

e

_{0 }= 8.854×10^{-12}permittivity of spaceR = radius of sphere in Meters

A

_{Large}with the Largest Radius of your semi sphereand also calculate C

_{small}with the smallest radius,Then average the capacitance C

_{avg}= ( C_{Large}+ C_{small}) / 2A