Figure P22.71 shows a power station (represented by the AC source) connected to a power line R

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Figure P22.71 shows a power station (represented by the AC source) connected to a power line R_line and a city represented by R_city. Suppose the power line has a resistance of 0.30 V/km and is 500 km long, and the current in the line is 1000 A.
(a) If the voltage at the power station is 800 kV (rms), what is R_city? Also find the voltage at the city, the power delivered to the city, and P_line/P_city (the ratio of the power dissipated in the line to the power dissipated in the city).
(b) Repeat part (a), but now assume the voltage at the power station is 400 kV (rms). Your answer for P_line/P_city will illustrate again why it is preferable to use high voltages to transmit electrical power over long distances.

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College Physics Reasoning and Relationships

ISBN: 978-0840058195

2nd edition

Authors: Nicholas Giordano

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Question Posted: Feb 16, 2019 11:03 AM

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Figure P22.71 shows a power station (represented by the AC source) connected to a power line R

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The current in a wire is the product of voltage and resistance The equivalent resistance of resistor...View the full answer

College Physics Reasoning and Relationships

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