# HW4 - Escuti/Masnari 2007 ECE200 Fall 2007 Homework 4...

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Escuti/Masnari 2007 ECE200 – Fall 2007 – Homework 4 Capacitors and Resistor Circuits (plus Diodes) Page 1 of 4 1. [8 pts total] Analyze the circuit at right and find the voltages at nodes A and B. 2. [12 pts total, 2 pts each part each circuit] Consider the circuit below. a. Determine if the diode is ‘on’. Assume the diode turn-on voltage is 0.7 V. b. Find the currents I 1 , I 2 and I D in each circuit. c. Find the voltage at node X in each circuit. Circuit 1 Circuit 2

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Escuti/Masnari 2007 ECE200 – Fall 2007 – Homework 4 Capacitors and Resistor Circuits (plus Diodes) Page 2 of 4 3. [16 pts total, 4 pts each] The capacitor in the circuit shown below is uncharged prior to closing the switch at t = 0. a. What is the time constant for capacitor charging in seconds? b. How long does it take for the capacitor to reach 6 V after closing the switch? c. What is the capacitor current when the capacitor voltage is 6 V? d. What is the magnitude of the stored charge at that instant?
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