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Homework #1: Rectifying diodes, zener diode and transistor.
Indications:
* Due date: May 11th, 2012 from 9:00 a.m to 3:00 p.m.
* When you turn in your paper, questions and answers must bepresent.
* Questions may be printed but all answers must be handwritten in English.
* It’s not important to have a perfect grammar when answering a question; however it should be as correct aspossible.

1. Suppose a DC power source with a voltage of 50 volts is connected to a 10 ohm load. How much power will this load dissipate? Now suppose the same 10 ohm load is connected to asinusoidal AC power source with a peak voltage of 50 volts. Will the load dissipate the same amount of power, more power, or less power? Explain your answer.

2. Determine the RMS amplitude of thissinusoidal waveform, as displayed by an oscilloscope with a vertical sensitivity of 0.2 volts per division:

3. Determine the RMS amplitude of this square-wave signal, as displayed by anoscilloscope with a vertical sensitivity of 0.5 volts per division:

4. The “1N400x” series of rectifying diodes are very popular for low-current applications. By “1N400x,” I mean the 1N4001, 1N4002,1N4003 . . . 1N4007. Only one parameter differs between these different diode models. What parameter is this, and what is its significance?

5. Predict how all component voltages and currents in thiscircuit will be affected as a result of the following faults. Consider each fault independently (i.e. one at a time, no multiple faults):

• Diode D1 fails open:
• Diode D2 fails open:
• Loadresistor fails open:
• Transformer T1 primary winding fails open:
For each of these conditions, explain why the resulting effects will occur.

6. Describe the operation of this diode testingcircuit:

Identify what the two light-emitting diodes (LEDs) will do when testing these three types of diodes:
• Good diode
• Diode failed shorted
• Diode failed open

7. Some inexpensive...