Farad

farad is the unit for capacitance in SI system. If one volt is developed as one coulomb charge is placed then capacitance has to be one farad.

But one farad is enormous large one so practically speaking we use only micro farad, nano farad and pico farad. They are respectively 10-6 F, 10-9 F and 10-12 F

I read that it 500 rms to 1 Farad.

Farad = Coloumb / Volt; solving for Coloumb, you get Coloumb = Farad x Volt. Just plug in the numbers - 1 microfarad is a millionth farad; 0.001 microfarad - if that is what you mean - is 0.000000001 Farad; wherease 1 KV = 1000 Volts.

The Farad, of capacitance.