Re: System power question

[John McKee <jmmckee@xxxxxxxxxxxxxx>]

Been too long.  Thumb points toward magnetic pole.  Direction fingers curl
indicate current flow.

John McKee


Quoting John McKee <jmmckee@xxxxxxxxxxxxxx>:

> The picture looks like it is clamped on a single wire.  Yes, it works by
> induction.  But, if around two wires, it would not have n induced
> voltage. Current flow in the two wires would ech induce  current, but
> in the opposite
> direction.  Result is no current induced.  Old physics refers to this 
> using (I
> get them confused, one is motor and other is generator rule) right 
> (left) hand
> rule.  Wrap hand around a conductor.  Thumb points in direction of
> current flow
> and fingers indicate orientation of induced magnetic field.
>
> Think about unshielded twisted pair.  Does not need shielding as the 
> two wires
> in the pair null induced voltage.
>
> John McKee
>
> Quoting Roger Harman <RHarman@xxxxxxxxxx>:
>
> > Works by induction.......
> >
> > http://us.fluke.com/usen/products/categoryclmp
> >
> >
> >
> > > > > jamesl@xxxxxxxxxxxxxxxxx 12/15/2008 2:30:04 PM >>>
> > rob@xxxxxxxxx wrote:
> > > Any competent electrician can put this thing that encircles the power
> > cord
> > > and does nothing to interfere with the flow.
> >
> > Actually, so far as I'm aware, such a device (an AC ammeter is what it's
> >
> > called) needs to go around a *single* conductor, rather than around the
> > entire power cord.
> >
> > --
> > James H. H. Lampert
> > Touchtone Corporation
> >
> > --
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>
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