1. The problem statement, all variables and given/known data So, for a school project I have to make a resistance soldering iron. As far as I know, this requires a high current going through high resistance wire (such as stainless steel in my case). I need to make this run from a standard 120v 15A wall outlet. I have figured out so far that it would be a good idea to run a D.C. power supply in the cable (similar to a laptop) to take the voltage and amperage down for safety. I need to be able to also make this safe to touch in case somebody touches the leads. I was thinking that grounding the circuit would do this, but I'm not sure. 2. Relevant equations So I'm not exactly sure what equations will need to be used, but I'm familiar with the simple ones such as W=I*V and I=V/R. 3. The attempt at a solution like I said, I believe I need to include a DC power supply to make this safe, as well as ground the circuit. If anybody knows the specifics of how much current is needed to make the tips of the iron go to ~800C similar to other soldering irons, that would be great.