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Category > Physics Posted 08 May 2017 My Price 7.00

A power of 100 kW

A power of 100 kW (105W) is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000 V.

(a)  Use the formula P=IV to show that the current in the lines is 8.3A.

(b)  If each of the two lines has a resistance of 10 Ohms, show that there is a 83-V change of voltage along each line. (think carefully. This voltage change is along each line, not between the lines.)

(c)   Show that the power expended as heat in both lines together is 1.38 kW (distinct form power delivered to customers).

(d)  How do your calculations support the importance of stepping voltages up with transformers for long-distance transmission?

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SuperTutor
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Status NEW Posted 08 May 2017 06:05 AM My Price 7.00

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