Electromagnetic Induction and Alternating Current 7 Question 17

17. If the direct transmission method with a cable of resistance 0.4Ωkm1 is used, the power dissipation (in %) during transmission is

(a) 20

(b) 30

(c) 40

(d) 50

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Answer:

Correct Answer: 17. (b)

Solution:

P=Vii=PV=600×1034000=150A

Total resistance of cables, R=0.4×20=8Ω

Power loss in cables =i2R=(150)2(8)

=180000W=180kW

This loss is 30 of 600kW.



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