ECE 200 ? Spring 2010 ? HW 3 Instructor: M.C. Ozturk 1) Find the voltage (with respect to ground) at nodes X, Y and Z. Assume all resistors are 100 ?. 2) Consider the circuit shown below. The diode has a turn?on voltage of 1 V a. First determine whether the diode is on or off and then find the diode current. b. Repeat the problem with R 2 = 1 k?. X Y Z X Y Z 3 V 2 V 2 V 3 V R1 = 2 K 6 V 1.5 V R2 = 2 K 3) The switch in the RC circuit shown below is closed at t = 0. How long will it take for the capacitor to charge to 90% of the power supply voltage? 4) Consider the circuit shown below. The capacitor is uncharged prior to closing the switch at t = 0. a. Find the capacitor current immediately after closing the switch. b. Find the capacitor voltage long after closing the switch. 5) After keeping the switch in the circuit of Problem 4 for a very long time (so that the capacitor reaches is steady state), the switch is opened again. a. Find the capacitor current immediately after opening the switch. b. Find the capacitor voltage long after opening the switch. 10 V 10 K 2200 nF nF = nano Farad 4 V 2 K 4 K 6 K 100 uF 2 V Mehmet Ozturk ECE 200 ? Spring 2010 ? HW 3
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