.ill AT&T; 8:55 PM * 100%) loncapa2.fsu.edu Corey George Fuller Student -section

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.ill AT&T; 8:55 PM * 100%) loncapa2.fsu.edu Corey George Fuller Student -section: 3 PHY Messages Courses Help Logout Messages Courses Help204Süt Gen Physics B (Fall 2017 Sections 2-5) Main Menu Contents Grades Course Contents »18 - AC Circuits II » Timer Notes Evaluate Feedback Print Voltage Across TransmissionH Lines If 46.9 kW is to be transmitted to consumers over two 0.0955 lines, estimate how much power is saved if the voltage is stepped up from 110 V to 1100 V and then down again, rather than simply transmitting at 110 V. Assume the transformers are each 99.5 percent efficient. 1.19 1044 W Submit Answer Previous Tries Incorrect. Tries 3/15 © 1998-2017 by Florida State University. All rights reserved The contents of this weh site are for use hy the

Explanation / Answer

P = 46.9 kW = 46900 W, v = 110 V

i = P / V = 46900 / 110 = 426.36 A

Plost = i2 * r = 426.362 * 2 * 0.0955 = 34.7 kW

34.7 kW + 46.9 kW = 81.6 kW

I = 110 * 426.36 / (0.995 * 1100) = 42.85 A

Plost = I2 * R = 42.852 * 2 * 0.0955 = 350.7 W

power delivered = 46900 / 0.995 = 47135.6 W

power present = 47135.6 + 350.7 = 47486.3 W

47486.3 W / 0.995 = 47,725 W

power saved = 81.6 kW - 47.7 kW

power saved = 33.9 kW

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