EGR203 Electric and Electronic Circuits Assignment 12

  1. Given the following circuit of an external resistor RS = 200 Ω and a diode with turn-on voltage VT = 0.7 V and internal resistance RD = 1 Ω, find the voltage VD and current iD for a source voltage VS = 12 V.

  2. Given the following circuit, in which R1 = 200 Ω, R2 = 100 Ω, V1 = 6 V, and V2 = 3 V. Assume the diode turn-on voltage is 0.7 V. Find the current through the circuit. Find the voltage V1 for which the diode just starts to conduct.

  3. Given the following circuit, in which R1 = R2 = R3 = 100 Ω, a diode with turn-on voltage VT = 0.7 V, and source voltage VS = 5 V. Find iD.

    Hint: Consider the Thévenin equivalent circuit.

  4. Solve the previous problem in Multisim, assuming a 1N4148 diode.

  5. The diodes in the circuit below have a turn-on voltage of 0.7 V. Determine the state of the diodes and the value of Vx and i.

    VSR1R2R3R4
    15 V 10 kΩ 5 kΩ 5 kΩ 10 kΩ

Maintained by John Loomis, last updated 11 November 2012