Electronics > Beginners
Newbie understanding joule heating
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rthorntn:
Thanks all.

OK so I just had a thought.

I have 4 x "Dernord" 12v 100w "17-11" cartridge heaters and a 48V 15A PSU.

Could I wire the 4 cartridge heaters in series to draw 8.33A at 48V from the PSU putting out 400W?

 
Eka:

--- Quote from: rthorntn on August 10, 2018, 03:36:19 am ---Thanks all.

OK so I just had a thought.

I have 4 x "Dernord" 12v 100w "17-11" cartridge heaters and a 48V 15A PSU.

Could I wire the 4 cartridge heaters in series to draw 8.33A at 48V from the PSU putting out 400W?

--- End quote ---
Yes, it's basically the equivalent of 4 resistors in series wired to a power supply with 4X the voltage. So the watts just add up, and the amp draw will be the same.
CatalinaWOW:
Don't give up on the nichrome.  There is a reason that almost all  commercial products doing this sort of thing use it or one of its cousins.

Winding it isn't onerous.  You need a form.  They used to be made of mica, then asbestos.  One has gotten rare and pricey.  The other is unpopular because it kills people.  But there are several ceramics and other materials that are insulators and can stand the heat.  Notches on the edge keep the nichrome where it belongs and it is amazing how rapidly the length builds up as you add turns around a form of the appropriate size for your project.

Another approach is to cannibalize an old toaster or room heater.  It will have both the forms and the wire.  Just adjust the length to compensate for the difference between mains and your voltage.
rthorntn:
Thanks, I might end up with nichrome but I'm working with cartridge heaters now because it's easy and I'm pretty sure it will do what I want.

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