Suppose 90 kW is to be transmitted over two 0.135 lines. Part A Estimate how much power is saved if the voltage is stepped up from 220 V to 2200 V and then down again, rather than simply transmitting at 220 V. Assume the transformers are each 99% efficient. Express your answer using two significant figures. Psaved = ΑΣΦ Submit Request Answer A simple generator has a square armature 9.0 cm. on a side. The armature has 90 turns of 0.59-mm-diameter copper wire and rotates in a 0.750-T magnetic field. The generator is used to power a lightbulb rated at 12.0 V and 25.0 W. Part A f= Value B Submit Request Answer At what rate should the generator rotate to provide 12.0 V to the bulb? Consider the resistance of the wire on the armature. Express your answer to two significant figures and include the appropriate units. ? Units kW ?

Suppose 90 kW is to be transmitted over two 0.135 lines. Part A Estimate how much power is saved if the voltage is stepped up from 220 V to 2200 V and then down again, rather than simply transmitting at 220 V. Assume the transformers are each 99% efficient. Express your answer using two significant figures. Psaved = ΑΣΦ Submit Request Answer A simple generator has a square armature 9.0 cm. on a side. The armature has 90 turns of 0.59-mm-diameter copper wire and rotates in a 0.750-T magnetic field. The generator is used to power a lightbulb rated at 12.0 V and 25.0 W. Part A f= Value B Submit Request Answer At what rate should the generator rotate to provide 12.0 V to the bulb? Consider the resistance of the wire on the armature. Express your answer to two significant figures and include the appropriate units. ? Units kW ?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter25: Electromagnetic Induction

Section: Chapter Questions

Problem 69A

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