Fundamentals of Electrical Engineering

Published by McGraw-Hill Education
ISBN 10: 0073380377
ISBN 13: 978-0-07338-037-7

Chapter 2 - Fundamentals of Electric Circuits - Part 1 Circuits - Homework Problems - Page 50: 2.19


a.) $p=-20W$ delivered b.) $p= 36W$ absorbed (Negative sign indicates that it was delivered)

Work Step by Step

a.) use passive sign convention, flip sign on voltage to get current flowing into the + terminal $ p = -10V * 2A = -20W $ (delivered) b.) use passive sign convention, change polarity of voltage source $ p = 9V * 4A = 36 W $ ( absorbed)
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