General Science • PhysicsEasy
What is the primary working principle behind the transmission of electrical power over long distance high-voltage power lines?
A. Minimizing heat energy loss by reducing current through high voltage step-up transformation✓ Correct Answer
B. Maximizing the magnetic flux density inside the copper conductor wires to accelerate electrons
C. Increasing the frequency of the alternating current to eliminate resistance completely
D. Using direct current to prevent electromagnetic radiation losses into the atmosphere
💡 Solution & Explanation
Electrical power transmission over long distances utilizes high voltages and low currents to minimize heat energy losses described by Joule heating law where power loss is proportional to the square of current multiplied by resistance. Lowering current via step-up transformers drastically reduces resistive dissipation in power cables. Alternative choices proposing complete elimination of resistance or using direct current without transformation misapply basic electrodynamics principles. Power grids worldwide rely on three-phase alternating current systems for efficient voltage transformation.
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