scott wrote:

> Note that the complex version of Ohm's Law only holds for steady-state 
> continuous sinusoidal operation, it won't explain what happens when you 
> first turn on a circuit or suddenly introduce voltage or current 
> spikes/steps.

...or rather, it does after you take those spikes and analyse their 
component harmonics. (?)

> In your example, if you have previously charged up a capacitor an 
> arbitrary amount, then yes, you can then get an arbitrary amount of 
> current out with no voltage.  Just charge up a capacitor with a constant 
> voltage, then short the terminals ;-)

But if the capacitor is charged then it *has* a voltage! 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.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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