11 Jun
2009
11 Jun
'09
9:10 a.m.
Warren Wolfe wrote:
I think there's some sort of square-cube thing
going on here that
makes ever-increasing values of capacitance ever huger.
I wrote:
Not really. For a given technology, the volume is
roughly linearly
related to the product of the capacitance and voltage.
Jim Battle wrote:
That doesn't make sense. energy = 1/2 * C * V^2.
You are saying if
you double the size of the cap you can handle double the voltage, but
that means four times the energy. That isn't right. It is the stored
energy that is linear with the size of the cap (roughly).
You're right. I
should have said that for a given technology and rated
voltage, the volume is roughly linearly related to the capacitance. No
square or cube there.
Eric