MoonMaster
- Mar 18, 2014
- 4
- Joined
- Mar 18, 2014
- Messages
- 4
I am planning on making a circuit using a NiCr coil to heat test tubes to 360-400 degrees Fahrenheit. I picked out a 110v AC to 12v DC converter on Amazon, which says it should supply up to 6w: (EDIT: amps, not watts)
http://www.amazon.com/gp/product/B003TUMDWG/ref=ox_sc_act_title_4ie=UTF8&psc=1&smid=A26WNKDWKDQIE8.
I would like to use 22awg, Chromel-C wire:
http://www.amazon.com/Nichrome-Wire...qid=1395182448&sr=1-13&keywords=nichrome+wire
I plan on making the circuit a simple series circuit, with a toggle switch and another resistor, the resistance of which I calculated as follows:
Using Wikipedia, I found that my circuit should run at 2.76A for 400 degrees, so 2.5A for more in the 360-400 degree range
The resistance/foot of 20awg Chromel-C wire is 1.015 Ohm/ft, so a 2ft coil would have a resistance of 2.03 Ohm
The current in the circuit would be V/(R1+R2) = I
V/I-R1=R2
(12v)/(2.5A)-2.03Ohm = 2.77Ohm, let's call it 2.8Ohm
The power dissipated by the coil would then be (2.5A)^2*2.03Ohm=12.6875W
Would this work? Would it be enough?
http://www.amazon.com/gp/product/B003TUMDWG/ref=ox_sc_act_title_4ie=UTF8&psc=1&smid=A26WNKDWKDQIE8.
I would like to use 22awg, Chromel-C wire:
http://www.amazon.com/Nichrome-Wire...qid=1395182448&sr=1-13&keywords=nichrome+wire
I plan on making the circuit a simple series circuit, with a toggle switch and another resistor, the resistance of which I calculated as follows:
Using Wikipedia, I found that my circuit should run at 2.76A for 400 degrees, so 2.5A for more in the 360-400 degree range
The resistance/foot of 20awg Chromel-C wire is 1.015 Ohm/ft, so a 2ft coil would have a resistance of 2.03 Ohm
The current in the circuit would be V/(R1+R2) = I
V/I-R1=R2
(12v)/(2.5A)-2.03Ohm = 2.77Ohm, let's call it 2.8Ohm
The power dissipated by the coil would then be (2.5A)^2*2.03Ohm=12.6875W
Would this work? Would it be enough?
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