Re: Strange voltage readings=Half-Wave Rectifier?

"Tom Biasi" <tombiasi@********optonline.net> wrote in message
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"Dana" <raff242@xxxxxxxxx> wrote in message
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"Tom Biasi" <tombiasi@********optonline.net> wrote in message
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"ghostwriter" <ghostwriter25@xxxxxxxxxxxxxxxx> wrote in message
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Here is the basics, I have a heating coil that I think has a
half-wave
rectifier in front of it (I am still waiting for the sales guy to
call
back). I get about 20Volts AC when measuring the hot wire to
ground,
0.8Volts AC when I measure the COLD wire to ground and 19.2Volts
between the hot and cold wires.

DC voltage osillates between 1.2 and 1.8 volts. So whatever it is
it
inst straight AC.

I want to be able to calculate the wattage that the system is
running
at, any help appreciated. The circuit havs 4.2 Ohemns of
resistance.

I'd guess 100 watts.

How did you guess that, on the DC or AC





It doesn't matter.

Depending on what the original poster needs, it does. He is stating he
thinks he has a rectifier, well that implies he is expecting a DC
output.
And with only 1.8v out, that would probably indicate an issue with the
rectifier.
I assumed he was measuring at the output of what he thinks is the
rectifier.
Hence that is where the values he gave come into play.
But if indeed it is just a simple AC heating coil, than yes about 100
watts
would be correct.




He squared the 20 volts and devided by 4 (rounded).
P=E^2/R
If the 4.2 Ohms was operating resistance then I agree with this "guess"


Tom




He stated a lot of things. But the question was of power consumption.
If the unit is getting 20 volts (ACorDC) then the power calculation
stands.

If he really cares about the rectifier he shouldn't say " I want to be
able
to calculate the wattage that the system is running
at, any help appreciated. "

I can agree to that. But when he gave AC as well as DC readings, and
mentioned rectifier, I assumed that maybe he had a DC type element.

I took all his extra readings to be just info we didn't need but he had no
way of knowing what we need.
If the voltage across the heating element is 1.8 volts then that's another
story.

Rectifiers before a heating element than has a stepped down supply of 20
volts makes no sense from a design standpoint.

Regards,
Tom



.

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