[Prev][Next][Index][Thread]
Re: Arc length vs pwr
Tesla List wrote:
>
> >From rwall-at-ix-dot-netcom-dot-comFri Oct 25 21:57:37 1996
> Date: Fri, 25 Oct 1996 17:32:17 -0700
> From: Richard Wayne Wall <rwall-at-ix-dot-netcom-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Arc length vs pwr
>
> 10/25/96
>
> R. Hull wrote:
>
> >It is very easy to measure charge at a great distance with an
> >electrometer using an isolated isotropic capacitance. This is how
> >electric field strengths are effectively measured. The crucial point
> >is that the meter must read only the scalar value of voltage.
RWW questions:
>
> Would you elaborate on "scalar value of voltage"? Isn't an electric
> field a vector? What are the other value(s) of voltage?
Hull answers:
Voltage is a scalar quantity! It requires no current flow to exist. It
is a value that need never be determined by others, (current, etc.),
though it can be and often is defined in this manner.
The electrometer comes as close to seeing this scalar measurement
realized by causing currents only in the attoamp range to flow through
its teraohm input impedance. ( the scalar voltage is little disturbed or
altered by the act of measurement). This is more of an electrostatic
thing than an electrodynamic one.
The electric field need not be a vector! Yes, in Maxwells equations,
electric field vectors are considered, but they are not necessarily the
same thing as what I was disucssing. His work looks are isolated electric
charges and currents. I was refering to a more generalized field
strength (megavolts/meter) without the extra baggage of directionality
or field shaping concerns.
snip> >
> >Richard Hull, TCBOR
> >
>
> Richard,
>
> Last week I bought a Model 341 Weston A-C & D-C Voltmeter at a hamfest
> for $15. It is a magnetically sheilded electrodynamometer and indicates
> absolute volts. In a field of five orsteds it only has a 0.4% fs
> deviation. I don't know much about this type of meter, but could it be
> used in TC experimentation because of it's magnetic sheilding ability?
>
> Thanks
>
> RWW
RWW,
I really couldn't say what the value of the meter would be in
Tesla coil work without looking at it. It does sound as if it is indeed
well shielded magnetically.
Richard Hull, TCBOR