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Unformatted text preview: ECE 210, Spring 2005 Homework 10 Solutions From Rizzoni, Problems: 5.59, 5.63, 5.68. In addition, for the circuit in 5.63, find the voltage across the resistor for t>0 for the case where the 10 V DC source is replaced by an AC source with voltage 10*cos(w*t) where w is the natural radian frequency of the circuit. For the supplementary problem where the 10 V source is replaced by an AC source with voltage 10cos( t ) , we do KVL around the circuit, then write the equation in differential form, 10cos( t ) = v R + v L + v C = iR + L di dt + 1 C idt = 1/ LC = 10 5 rad / s d 2 i dt 2 + R L di dt + 2 i = L 10sin t The roots of the homogeneous part of this equation are, for the given values, s = R 2 L 1 2 R L 2 4 2 R 2 L j The homogenous solution (or natural response) is then i H ( t ) = e tR /2 L A sin t + B cos t ( ) For the inhomogeneous solution (forced response), we can do phasor analysis. Note that there...
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 Spring '05
 KELLEY/SEYLER
 Volt

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