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If you had a simple circuit of one hot wire (10 ohms), a load (100 ohms), and a neutral wire (10 ohms) at 120 volts;

total resistance would be 120 ohms,

divide 120 volts by 120 ohms = 1 amp (electrons),

current stays the same in a series circuit,

so 1 amp would flow through each part of the circuit,

1 amp times 10 ohms equals 10 volts dropped on each wire,

120 - (10 + 10) = 100 volts left for the load,

1 amp through the 100 ohm load proves this

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