Re: K Factor & Mutual Inductance

```Subject:
Re: K Factor & Mutual Inductance
Date:
Wed, 9 Apr 1997 07:16:02 +0000
From:
"John H. Couture" <couturejh-at-worldnet.att-dot-net>
To:
Tesla List <tesla-at-pupman-dot-com>

At 04:01 AM 4/8/97 +0000, you wrote:
>Subject:
>        Re: K Factor & Mutual Inductance
>  Date:
>        Mon, 07 Apr 1997 11:44:00 -0500 (EST)
>  From:
>    To:
>        tesla-at-pupman-dot-com
>
>
>Hi John, All,
>Have you ever tried the formula Q = sqrt( L / C ) / R.
>
>Barry
>
> ----------------------------------------------------

Barry -

I have never seen the above Q factor equation before. What would you
use
for R? In the usual equation   Q = X/R   where X = 6.283 F L  the R is
an
effective resistance, not DC or AC.  The only way to find the R is to
use a
value for a typical Q and X and solve the equation for R. The Q factor
like
the K factor is easily found by tests after the TC is built, however, at
the
design stage these two factors are difficult to determine.

The basic nature of Q for Tesla coils has to do with the energy stored
in
the field of the coil and the energy dissipated. The Q factor also
involves
resonant rise in voltage and other electrical effects. It is also
interesting that Q involves other phenonmena such as in the swing of a
pendulum and in horological science ( measuring time).

John Couture

```