[simpits-tech] electrical ??

[Dave Hensley]

Thanks! I did find this, which may help. On the back of the panel it has
"10#7152 LAMPS". I'm assuming this means there are 10 lamps in the panel,
part number 7152. I searched on this and found a PDF doc with lamp part
numbers.

Line     Part                                                   Filament
Life

No.       No.       Volts    Amps   M.S.C.P.       Type            Hours

7        7152     5.0    0.115    0.15         C-2R         40,000


So, IF that is the lamp being used then could I figure the amps by
0.115*10(number of lamps)=1.15. I'm starting to feel in over my head a
little, so I may do some studying and come back to this later. I still
appreciate any help you guys can give.

Dave

----- Original Message -----
From: "Andreas Fransson" <andreas.fransson@post.utfors.se>
To: <simpits-tech@simpits.org>
Sent: Saturday, September 14, 2002 2:05 PM
Subject: Re: [simpits-tech] electrical ??


> (disclamer: my high school electrical skills may be a bit rusty...)
>
> IIRC...
>
> P=UI (watts = volts x amps)
> I=U/R (amps = volts / ohms)
> =>
> P=U^2/R (watts = volts(square) / ohms)
>
> You have already concluded that the panel has a 0.5 ohm resistance, and is
> rated at 5 volts. This means that it draws 5^2/0.5=50 watts at that
voltage.
> That seems to me to be a whole lot...
>
> At 5 volts, the current should be 5/0.5=10 amps...
>
> Someone please correct me if I have gotten all of this backwards. ;)
>
> Andreas
> http://valhallainc.d2g.com
>
>
> From: "Dave Hensley" <dphens@nc.rr.com>
> > I need a little assistance with a power problem. I am trying to
determine
> > the amount of amps I need going through the panels I have to light them
> up.
> > The panels are rated for 5vdc. I plugged in a 6vdc adapter which is
> putting
> > out 7.70v before anything is connected, measured with a mutlimeter. Then
I
> > connected leads to the adapter and the panel, while leaving the leads
for
> > the multimeter connected also. The volts in the multimeter dropped to
> 4.41v.
> > Next I connected only the meter to the panel set to measure resistance
and
> > had a reading that fluctuated between .4 to .6, so I split the
difference
> at
> > .5. So, using V=I*R formula, 7.70/.5=3.85. So, the lights are pulling
> almost
> > 4 amps? Am I even close to having that right?
> >
> > Obviously you guys are seeing that I know very little about this and am
in
> > the process of learning. I am playing with the panel in an attempt to
> > understand the relationship of volts, current and resistance. If am I
way
> > off at this point, I'll stop and do some more reading. I am just hoping
I
> am
> > on the right track. :-)
> >
> > Thanks!
> >
> > Dave
>
>
>
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