Electrical Engineering: Principles & Applications (6th Edition)

by Hambley, Allan R.

Published by Prentice Hall

ISBN 10: 0133116646

ISBN 13: 978-0-13311-664-9

Chapter 1 - 1.3 - Problems - Power and Enery - Page 36: P1.28

Answer

a) 50W. Energy is taken b) 50W. Energy is taken c) 50W. Energy is delivered

Work Step by Step

Part a) i = 2A, V = -25V Power = |i*V| = 50W Current flows from (-) to (+) so energy is being taken Part b) i = -2A, V = 25V Power = |i*V| = 50W Current flows from (-) to (+) so energy is being taken Part c) i = -2A, V = -25V Power = |i*V| = 50W Current flows from (+) to (-) so energy is being delivered

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