O-LevelPhysicsMagnetism5054/11 · Oct/Nov 2010 · Q351 Mark
Electric power cables transmit electrical energy over large distances using a high voltage, alternating current. What are the advantages of using a high voltage and of using an alternating current?
Ahigher current is produced in the cable, the resistance of the cable is reduced
Bhigher current is produced in the cable, the voltage can be changed using a transformer
Cless energy is wasted in the cable, the resistance of the cable is reduced
Dless energy is wasted in the cable, the voltage can be changed using a transformer
✓ Correct answer
D: less energy is wasted in the cable, the voltage can be changed using a transformer
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