EEC 242 Fundamentals of Electronics Resit 2023

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EEC 242: Second Semester Resit, University of Buea, College of Technology, Instructors Dr Njitacke/Dr Megam, July 2023: Exercise 1, starter-cable voltage-drop calculation for jump-starting petrol vs diesel vehicles from copper-cable resistance, an aluminum wire free-electron concentration and mobility calculation from its density/valence/resistivity, and 4 semiconductor/diode MCQs; Exercise 3 (NPN transistor amplifier, simplified IC=100*IB model), plotting the output-characteristic network for 5 given base currents and the DC load line/transfer characteristic for a given EC and RL; a second section also printed as 'Exercise 3' in the source covering a Zener-diode shunt regulator (bias mode, ON/OFF equivalent circuits, Izmax/Uzmax, power dissipation, the Iz=f(Uz) and Uz=f(e) characteristics, and the parameter needed for good regulation); Exercise 4, an ideal op-amp weighted summing/difference amplifier, deriving Vs in terms of e1,e2,e3 via Millman's theorem and superposition, and its behaviour as an adder-subtractor vs a simple inverter for two special resistor cases.