Resistance is key to both traditional soldering irons as well as the Cold Heat iron. Electricity flows more easily through materials with many free electrons like copper than through those with fewer free electrons like carbon. Therefore, carbon-based substances have a higher resistance. Moving current through materials with high resistance can cause heat or light. This is also the principle that light bulbs operate on -- a light bulb has a resistive filament which heats up and shines when current flows through. A Cold Heat tool's heart is a broken circuit. It travels from a few batteries to a tip with two halves. Although the tip may appear one piece, a dark insulation material keeps them both electrically separated. learn more about accurate ways to solder...
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