The black box is the housing. The green bar will be wrapped with

nichrome wire. I need help calculating how much

voltage

i need to run. The battery supply must be button cells. Im sorry for the bad explanation plz ask questions so i can further explain.

The wire must be hot enough to burn

Edited July 11, 201213 yr by krishnapconcepts

OK, I'll bite, What is it, what is the function?

a lighter you could use in the wind they already have them out but i want to make my own

This is what I thought ...

you can use I²R= Q , where Q is the amount of heat supplied per unit time to melt the

nichrome

wire , R is the resistance of the wire (you can measure it using a digital multimeter ) from this you can calculate the 'I' and using Ohm's law you can calculate the required voltage . since you need the wire to be red hot the heat supplied should be less than the heat required to melt it ..., so any voltage little less than the calculated one may get you the job done....

Edited July 16, 201213 yr by Hemanth