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Subject: Re: nichrome wire
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Sun, 27 Oct 2002 11:31:11 GMT
NNTP-Posting-Date: Sun, 27 Oct 2002 12:31:11 MET
"John Woodgate" schrieb im Newsbeitrag
> >I was wondering if anyone could help me out with a problem. A piece of
> >nichrome wire i am using as a resistor cant really handle the current
> >and melts away.The value of the resistor has to be 4.8ohm and draws
> >4.4Amps.The dianeter of the wire is only 0.4mm.Does anyone have any
> >cooling options that i could use or any ideas.
> Buy a 4.7 ohm 250 W resistor. A few $. It isn't sensible to try to make
> Regards, John Woodgate, OOO - Own Opinions Only.
John is right,
but if you do not want to spend a lot of money...
find these 1500W immersion heaters or water kettles and check for
resistance, put two in parallel with some water
voila! around what you need.
Or take toasters
Since you operate them only with a meager 100W, the temperature rise of the
resistive metal stays low and might be corrected for. The resistance of my
kettle rises from room temp.(23.9R) to water boiling(27.93R) by 17%. Pure
copper or aluminum would increase its resistance from 25°C to 100°C by 33%,
so there is already used a more stable alloy.
The heater has 2200W, but in Europe we have 4 times the
electronic hardware designer
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