Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 28 - Fundamentals of Circuits - Stop to Think 28.6 - Page 786: 1


4 seconds

Work Step by Step

Recall that the time constant for an RC circuit is $\tau = RC$ While we're given the total capacitance since there's only one capacitor, we still need to find the total resistance. When the switch is closed, the resistors are in series and $R_{total} = \Sigma_i^nR_i = R_1+R_2+...+R_n$ $R_{total} = 2 \Omega + 2\Omega = 4\Omega$ $\therefore \tau = RC = (4\Omega)(1F) = 4 $ s
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