On Fri, Nov 28, 2008 at 05:26:49PM -0600, John Hasler wrote:
> lee writes:
> > But how do know that there is voltage when you cannot measure it or
> > otherwise make evident that there is? As far as I understand it, you
> > cannot do that without current flowing. You can do it for water pressure
> > without water flowing, but I don't see how you could do it for voltage
> > without flow.
>
> You could use a potentiometer (not the kind you are used to:
> <http://en.wikipedia.org/wiki/Potentiometer_(measuring_instrument)>) or
A wheatstone bridge?
> you could measure the force exerted on a capacitor plate. Both these
> methods are used in standards work. Usually, though, you would just use a
> voltmeter with an input impedence larger that the leakage-resistance of
^^^^^^^^^
impedance
> the wires connecting it to the source.
Sensitivity?
--
Chris.
======
I contend that we are both atheists. I just believe in one fewer god
than you do. When you understand why you dismiss all the other
possible gods, you will understand why I dismiss yours.
-- Stephen F Roberts
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