A power station supplies a factory 400 m away by two wires. The potential difference between the terminals at the factory is 220 volt and the current flowing through it is 80 ampere. Calculate the potential difference at the station given that the resistance of one meter of the wire is 5*(10^-4) ohm/m

Question

anonymous · Answer

The supply wires running between the power station and the factory have resistance, ok, which you can calculate from the information given in the question.
Then, knowing the resistance in a wire and the current flowing, you should be able to calculate the voltage drop along the wire using ohms law.
Then you can use kirchoffs voltage law to figure out what voltage the station has to provide, if it has to compensate for the voltage lost in the wires and still give 220 volts to the factory.