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Unformatted text preview: S is initially open. Find the current I through the battery (a) while the switch is open, (b) immediately after the switch has been closed, (c) a very long time later. 7H 6 2 3 12V S (a) I = 12V 2 + 3 + 6 = 1 . 09A . (b) I = 12V 2 + 3 + 6 = 1 . 09A . (c) I = 12V 2 + 3 = 2 . 4A . tsl357 p.3/4 Intermediate Exam III: Problem #4 (Spring 06) Consider the circuit shown. The ac voltage supplied is E = E max cos( t ) with E max = 170 V and = 377 rad/s. (a) What is the maximum value I max of the current? (b) What is the emf E at t = 0 . 02 s? (c) What is the current I at t = 0 . 02 s? ~ L = 30mH (a) I max = E max X L = E max L = 170V 11 . 3 = 15 . 0A . (b) E = E max cos(7 . 54rad) = (170V)(0 . 309) = 52 . 5V . (c) I = I max cos(7 . 54rad/ 2) = (15 . 0A)(0 . 951) = 14 . 3A . tsl358 p.4/4...
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This note was uploaded on 04/30/2008 for the course PHYS 204 taught by Professor Andrevantonder during the Spring '07 term at Rhode Island.
 Spring '07
 AndrevanTonder
 Current

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