On Sunday, Apr 18, 2004, at 06:34 US/Pacific, Gerhard Fiedler wrote:

>>> In order to have a voltage without a current, you would have to
>>> postulate a resistance with the value "infinity" -- something
>>> possible in
>>> theory, but not really in practice.
>>
>> You better hope it's achievable, the program memory storage in your
>> pic works that way.
>
> I suppose you are talking about Flash memory. Are you sure that there
> is no current? I mean, not "no current for practical purposes in most
> cases" but /no/ current?

You can have an electric field, measured in volts, without current
flowing.  Just like with magnets (there's even an "electret", the
electrical equivalent of a permanent magnet.)  Field effect transistors
can sense the electric field (more or less) the way a hall effect
device senses a magnetic field, so you can implement eproms, flash,
etc...

Ohm's law refers to circuits, though.  Not static fields or components?

BillW

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