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Mar18-12, 04:35 AM
Sci Advisor
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For a lab experiment you can get excellent results with 24W from a 12V source. Easier and safer. 1kg of water is about right.

if you just want to get the wire hot then you really don't want to have a damned great lethal coil of red hot wire to deal with. Do it with a short length and a low voltage (C cell), briefly. How would you plan to measure the temperature? In air it should get red hot - what temperature would that represent?