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ECE141_2010FALL_EXAM3__[0] - Electrical Engineering...

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Unformatted text preview: Electrical Engineering Department The Cooper Union ECE 141B Circuits and Electronics I Examination 3/ Fall 2010 1. Steady-state is established in the circuit shown below with the switch closed. At t = 0, the switch is opened. i(t) 309 a) Determine iL(0-), v(0-) and i(0-) from the circuit at t = 0—. b) Determine iL(0+), v(0+) and i(0+) from the circuit at t = 0+. c) Determine the expressions for currents iL(t)', i(t) and the voltage v(t). . a (40%) 2 The switch in the linear dynamic circuit given below has been in the open position for a long time before it is closed at t = 0. ' a) Determine i(O—), vL(O-) and vc(0-) frdm the circuit at t = 0-. b) Determine i(O+), vL(0+) and vc(0+) from the circuit at t = 0+. c) Obtain the linear ordinary differential equation for the current i(t) for t > 0. - (1) Determine the damping classification for the circuit for t > 0. -' (40%) 3. The source is(t) in the linear RLC circuit given below is defined by the waveform shown. is(t) A a) Determine the expression for the sinusoidal source is(t). b) Obtain the appropriate <|>-domain model for the given circuit. (20%) ...
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