I want to build a simple and cheap circuit to power a NiCr heating wire using 120VAC 15-amp household current. I want to be able to vary the heating power across the NiCr element from 0 to 100 watts. Assuming I'm not cutting the voltage, my understanding is that this means I need a rheostat circuit in series with the heater capable of ranging from 120Ω up to kΩ or MΩ, and capable of dissipating 120 watts at its lowest resistance! The only rheostat I can readily purchase is a 25Ω 3W pot from Radioshack. Does anyone have clever ideas on how I could build my circuit using household or readily salvaged components?