Invisible wrote:
> 
> Similarly, a capacitor can store charge such that when you turn off your 
> external current source, the capacitor is still presenting a voltage to 
> the system, and hence current is still flowing. There is no mystery in 
> that. The mystery is in saying that there is actually "no voltage", and 
> the current is just magically flowing all by itself.
> 

You can think of external resistor to help. Let's say you'd have a 
capacitor and a resistor connected in serial. Connect a voltage meter to 
the capacitor (in parallel) and connect this set to a battery. You'll 
see how the voltage starts to increase, starting from 0. Right?

The thing is, if you'll connect the capacitor without the resistor, what 
happens is actually *exactly the same*. The increase of the voltage is 
just so fast that you'll have no chance to actually follow it, so the 
full voltage just seems to appear, even though it has raised with (very 
little amount of) time.

-- 
Eero "Aero" Ahonen
    http://www.zbxt.net
       aer### [at] removethiszbxtnetinvalid

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