What is the resistance of a 120 volt 15 amp circuit?

We know that V=IR This can be re-arranged for R by dividing by I. This leaves R=V/I Plug in the values V=120 & I=15: R=120/15=8 ohms.

Amperage of the variable voltage control that is supplying the circuit. That will result in a full scale adjustment (0 to 100%) of a 120 volt, 15 amp, variable voltage control. Would be needed to meet the requirements?

15 amp rating? 100% of the maximum control voltage. Volt control will result in an output of 120 x .50 (50%) = 60 volts.

Result in an output of 120 x .30 (30%) = 36 volts. A 6ft piece of 21gauge nichrome wire will have a total resistance of .831ohms/ft x 6ft = 4.986 ohms. Exceeding the controller’s amperage rating.

Temperature that the 21gauge nichrome wire will achieve at 12 amps? We can estimate the temperature to be approximately 1700°F at 12 amps.

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