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RE: [TCML] Meters (was Variac)
So I can use the volt meter with any current
and the ammeter with any voltage
If thats right...thats what I thought before the ebay guy confused me..
-------------- Original message --------------
From: "Lau, Gary" <Gary.Lau@xxxxxx>
> I changed the Subject to "Meters", as that's what this is really about.
> Voltmeters are not at all aware of or rated for the load current, or power. It
> doesn't matter to them, they're not even capable of sensing that. I'm not sure
> in what context the eBay unit you mentioned was for use "in the ma level". It's
> possible that this was the load current that the _meter_ draws, unrelated to how
> much your Variac load (coil) draws, but this is usually insignificant and a
> Similarly, a current meter is unaware of and doesn't care what voltage the power
> supply is providing.
> Only in a Wattmeter, a 4-terminal device, is power (the product of both voltage
> and current) relevant.
> Regards, Gary Lau
> MA, USA
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of jhowson4@xxxxxxxxxxx
> > Sent: Friday, October 24, 2008 11:31 AM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] Variac
> > Sweet thanks for the help. I guess my question is really how do I determin
> > much power such a meter would be able to handle. all the web sites i found
> just list
> > what voltage its good for and not what current or power.
> > Like if if got a regular old volt meter 0-150 AC what current could I use it
> with. the
> > one i was going to get on ebay i found out from the seller to be rated for
> 150v but
> > only in the ma level. well thats no good for my TC variac.
> > I do like what you said about the ""circular" transformer" thing . Is that
> like a toroid
> > core type set up.
> > anyone try to make one of these before.
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