## Re: Watts...watts that?

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• Thanks for the help. I thought I could use a multimeter to use it like a digital readout to turn the dial to read the amps or watts. ... measurements and
Message 1 of 7 , Sep 9, 2006
Thanks for the help. I thought I could use a multimeter to use it
like a digital readout to turn the dial to read the amps or watts.

--- In new_distillers@yahoogroups.com, Tony Smith <tony9812001@...>
wrote:
>
> In order to measure power in watts you have three options.
>
> 1) Power = Voltage multiplied by Current
>
> 2) Power = Voltage squared divided by Resistance
>
> 3) Power = Current squared multiplied by Resistance.
>
> So you could setup a current meter and a voltmeter, take
>
> I would calculate the resistance of the heating element myself.
>
> P = VxV/R transposes to R = VxV/ P
>
> i.e. 1500 Watt element at 120 Volts would give 9.6 ohms.
>
> (120 x 120)/1500 = 9.6
>
> So by taking voltage readings you could make up a table of dial
markings which could then be correlated to power settings.
>
> i.e.
>
> 80 Volts would be (80 x 80)/9.6 = 667 watts at some dial
setting
>
> 90 Volts would be (90 x 90)/9.6 = 844 watts at the next dial
setting
>
> And if you want specific power settings, just calculate the
voltage you need to produce that power setting and record the dial
>
> i.e. A setting to reduce to after the solution gets up to the
temp you are targeting.
>
> Have fun!
>
> Robert Thomas <whosbrewing@...> wrote:
> I'm not sure you can measure watts; only volts and amps.
> However, an other solution might be to replace the dial nob.
> You (that is I) can get dial nobs that replace the original with a
> multiturn per original turn mechanism, so it takes lots more
twiddling
> for the same effect. They appear to be geared somehow inside.
> I have no idea what they are called, try browsing you favorite
> electrical/electronic catalogue for "dial multi-turn' or some such.
> cheers
> Rob.
>
> --- cartierusm2004 <htcustom@...> wrote:
>
> > I appreciate the response but I was looking for a way to measure
the
> > amount of watts the element is drawing based on where my variac
was.
> > My variable transformer is just a modified router speed control
and
> > has marks on the dial and I know where optimal is BUT when the
still
> > is first starting to make alcohol the slightest hair movement of
the
> > dial affects the temp, so if I could monitor the watts on a
> > multimeter or the like I would be able to be a little more
accurate.
> > I thought I read on here people were monitoring watts with a
> > multimeter, maybe I was mistaken.
> >
> > --- In new_distillers@yahoogroups.com, "stevolate" <stevolate@>
> > wrote:
> > >
> > > Hi
> > > I drilled a small hole through the dial on the triac and
pushed a
> > SS
> > > 3" long rod in it. On the box I marked out a large circle and
> > marked
> > > in increments, which I numbered. Then I experimented to see
how it
> > > boiled at different settings, always recording my settings.
Now I
> > know
> > > what setting to run it on to collect forshots then heads next
> > middle
> > > run then tails. If you connect a large light to your triac you
can
> > see
> > > where the power starts and guess half way to full power. This
gives
> > > you a starting point to experiment.
> > >
> > > Happy drinking
> > >
> > > Stevo
> > >
> > >
> > >
> > >
> > >
> > > > I'll start a new thread; people are getting tired of
> > the 'newbie, what
> > > > to build thread'. Thanks to Stevo, I won't be using a PID,
it's
> > > > cheaper anyway. So is there a way to measure how many watts
my
> > water
> > > > heater element is using so when I adjust my variable
transformer
> > I
> > > > will be able to dial it in exactly? I know quite a bit about
> > > > electronics and have some pretty high end millimeters but I
> > don't
> > > > think I have one that measures current(draw? amps?). Any
help
> > would be
> > > > appreciated.
> > > >
> > >
> >
> >
> >
> >
> >
>
> Cheers,
> Rob.
>
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