# Difference equation of simple RLC Circuit

by Eng67
Tags: circuit, difference, equation, simple
 P: 21 I have been having a difficult time understanding how to determine the input/output difference equations of a circuit. I believe I am good on series circuits but would like some feedback on Series/parallel determinations. Please look at included file and see if I am on the correct path. Attached Thumbnails
 P: 161 Are you sure the answer you gave is correct? I got L d2(i_R)/dt2 + R d(i_R)/dt + (1/C) i_R = L d2(i)/dt2 + (1/C) i or if you can render in Latex $$L \frac{d^2 i_R}{dt^2} + R \frac{di_R}{dt} + \frac{i_R}{C} = L \frac{d^2 i}{dt^2} + \frac{i}{C}$$

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