> And current will flow until that charge has been exhausted. There's 
> nothing mysterious about that. But claiming such a system has "no voltage" 
> and yet there's current flowing through it is just silly.

As you know, a sine wave is only at zero for an infinitely short period of 
time, so actually the voltage is never exactly zero for any finite period of 
time.  But at the instant it is zero, it is normal to have a non-zero 
current when dealing with capacitors and resistors.

Someone posted this here a while ago:

http://www.falstad.com/circuit/

The default circuit that opens is exactly the point here.  See how the green 
and yellow lines on the scopes at the bottom are out of phase?  Green = 
voltage, yellow = current.

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