4.4 Problems

David J. McLaughlin

4.4 Problems

4.1 Determine an appropriate value of $R$ so that 20mA flows through the LED in figure P4.1 if $V_{B}=3V$ . Assume the diode has a turn-on voltage $V_{f}=2V$ and $R_{D}=10\Omega$ . Part (a) use the piecewise linear model; Part (b) use the simple piecewise linear model; part (C) use the ideal diode model.

4.2 Determine the current flowing in the following circuit if $R=100\Omega$ and if $V_{B}=3V$ . Assume the diode has a turn-on voltage $V_{f}=2V$ and $R_{d}=10\Omega$ . Part (a) use the piecewise linear model; (b) use the simple piecewise linear model; (c) use the ideal diode model

4.3 Determine an appropriate value of $R$ so that 20mA flows through the LED in the circuit of figure P4.2, above assuming the diode characterized by the following $i-v$ curve

4.4 In the following circuit, the input voltage is $v_{s}(t)=50\cos(2\pi t)$ . Assume the diode is ideal and determine the average and RMS values of the input and output waveforms

4.5 Determine the current in the following circuit. Assume $V_{f}=2.0V$ for the LED.

4.6 In the following circuit with $V_{B}=5V$ Determine R so that the current in the circuit loop is 20 mA. Assume $V_{f}=2V$ for the two light emitting diodes.

4.7 Determine the current flowing from the battery in the following circuit. Assume the diodes are ideal.

4.8 Determine the currents, $I_{1}$ , $I_{2}$ , and $I_{3}$ for the circuit shown if $V_{B}=5V$ and $R_{1}=R_{2}=R_{3}=100\Omega$ . Assume the LEDs have $V_{f}=2V$ and $R_{D}=10\Omega$

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Applied Electrical Engineering Fundamentals by David J. McLaughlin is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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