# Re: power v energy measurements, was Re: SSTC does 10 foot sparks

```Original poster: "John Couture" <johncouture-at-bellsouth-dot-net>

Thanks. You are correct. That should be watt seconds, not watts per second.
The watt second stuff is also wrong.  I really messed up that post. I will
try to get it right this time.

I have shown  in past posts how I tested my coil. The test showed that my
small coil will produce with an input energy of one joule an output of one
spark that is  8.25 inches long. This test is based on sound engineering
principles.  Before we can go any further this type of test should be
understood and  approved by the majority of coilers.

The math is grade school level. However, the concepts are a much higher
level.

The calcs for my test were as follows.
1. My coil wattmeter showed 120 watts for one second or 120 joules in one
second.
2. My coil output was 120 sparks for one second.
3. This gave 120 joules/120 sparks = one joule produced one spark
4. The spark was 8.25 inches long,
5. This gave 8.25 inches / one joule = 8.24 inches of spark for one joule of
energy input.

If you substitute the variables of any size or type of coil correctly and do
the math correctly as above you will find that the 8.25 inches is a record
that is hard to beat.

understand what you mean..

John Couture

--------------------------------

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, June 23, 2004 10:23 PM
Subject: Re: power v energy measurements, was Re: SSTC does 10 foot sparks

> Original poster: Mddeming-at-aol-dot-com
>
> Hi John, All,
>
>
> In a message dated 6/23/04 1:34:26 PM Eastern Daylight Time,
> tesla-at-pupman-dot-com writes:
>
>  >The tests consist of finding the TC input energy by connecting a
wattmeter
>  >to the input of the TC. This will give you input watts per second
(joules).
>
> Watts per second is not Joules. Watt seconds is Watts TIMES seconds=
> Joules. Watts per second is Watts DIVIDED by Seconds.Watts per second is
> therefore Joules per second squared, or some sort of "acceleration of
> energy", or "velocity of power", or some such meaningless quantity.
>
>  >You then turn up the Variac so you have 120 watt seconds input and
>  >the spark output for a continuous 120 sparks per second. You will then
have
>  >120 watt seconds / 120 sparks per second giving you  "one joule per
spark"
>
> Unfortunately, 120 watt seconds/120 sparks per second would be
>   (120 W. sec) /120 spark/sec = 1 Watt sec^2
>
> I think what you meant is
> 120 Watts / 120 sparks/Sec = (120 Joules/sec)/(120 sparks/sec) = 1
Joule/spark
> which is dimensionally consistent.
>
> Inverting this does give you sparks/joule. Assuming all sparks are the
same
> size and that each spark contains energy from exactly one-half input
cycle,
>
>  >or "spark inches per joule of energy". I did this for my small TC and
>  >obtained 8.25 inches per joule. If you perform this test with any small
>  >SPTC or SSTC you will have a fair energy comparison of the Tesla coils.
>  >Of course the 120 sparks per second would have to be changed to the
actual
>  >number per second.
>
> I like your concept, and fortunately the mistakes in nomenclature and the
> mistakes in math exactly canceled out to give you the answer you seek, but
> I would hate for anyone with a shaky understanding of math and physics to
> have to follow the development. ;^)
>
> Matt D.

```