The two wires of a high-voltage transmission line are carrying 900 A to and from a...
The two wires of a high-voltage transmission line are carrying 900 A to and from a city. The voltage between those two wires is 200000 V. In bringing electricity to individual homes, the power is transferred to low-voltage circuits so that the current passing through homes experiences a voltage drop of only 120 V. How much total current is passing through the homes of the city?
Homework Answers
Power , P= VI
Initial power in wires of a high-voltage transmission line = Pi = 200000 V x 900 A = 180000000 W
Final power in low voltage wires = Pf = 120 V x If
Pf = Pi
If = 180000000 / 120
If = 15,00,000 A Answer
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