PH-1596
Power transmission
Physics · Secondary 4 · Hard · Power transmission
A step-up transformer increases the voltage from 5.0 kV to 50 kV before sending electricity along transmission lines. Why does using a higher voltage reduce energy loss in the lines?
- Because a higher voltage allows a smaller current, so losses in the cables are reduced.
- Because a higher voltage makes the resistance of the cables smaller.
- Because a higher voltage increases the power loss, heating the cables less.
- Because a higher voltage makes the cables act like perfect insulators.
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