In normal house wiring, 110 vac, the black lead is considered the "hot" or line lead and the white one as the neutral. When wiring to a variable resistor, the variable lead normally goes to the load so the voltage can be changed and the other lead to the "line."
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In normal house wiring, 110 vac, the black lead is considered the "hot" or line lead and the white one as the neutral. When wiring to a variable resistor, the variable lead normally goes to the load so the voltage can be changed and the other lead to the "line."