> Well OK, but you can make the voltage arbitrarily small while making the 
> current arbitrarily large. Just by asking nicely.

Of course, but then in another part of the cycle you will have to have a 
large voltage with a small current.

> In my experience - and hell, what would I know about reality? - things 
> don't just move of their own accord. There must be a *force* driving them.

A capacitor stores energy, this can generate force.

> Otherwise we'd all by driving perpetual motion machines to work by now...

I know you like maths :-)

http://en.wikipedia.org/wiki/Deriving_capacitor_impedance

Post a reply to this message