Which of the following modes is the most economical method of transmitting electrical power over long distances?
alternating current at low voltage and high current
alternating current at high voltage and high current
alternating current at high voltage and low current
direct current at low voltage and high current
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The most economical method of transmitting electrical power over long distances is alternating current at high voltage and low current. This is because the power loss in a transmission line is given by the formula P=I²R, where P is the power loss, I is the current and R is the resistance of the transmission line.
The primary reason that power is transmitted at high voltages is to increase efficiency. As electricity is transmitted over long distances, there are inherent energy losses along the way. High voltage transmission minimizes the amount of power lost as electricity flows from one location to the next.
The selected answer is wrong:
the ans is A becos if it is passed with high voltage the pressure in the wire will be too much and the rope will cut
