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AC Current flow
in 120/240 V AC single phase three or four wire systems is frequently
misunderstood. This technical brief goes through a step by step process of
adding one load at a time to a 120/240 V AC system and looking at the resulting
current flows.
There is an
assumed understanding of basic DC theory, Ohms Law (V=IR), the Power Law (P=VI)
and Kirchhoff’s Voltage and Current Laws.
1.
The sum of the voltage rises equals the sum of
the voltage drops around any closed loop.
2.
The sum of the currents entering a junction
equals the sum of the currents leaving the junction.
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