# Introduction to Electronics – PHYS2211

| January 11, 2016

Introduction to Electronics – PHYS2211

Fall Semester 2015

Assignment #2

Due date: November 4th, 2015

1. Draw the output voltage waveform for each circuit Figure 1 and include the voltage

values.

Figure 1

2. A power-supply transformer has a turns ratio of 5:1. What is the secondary voltage if

the primary is connected to a 120 V rms source?

3. Find the average value of each voltage in Figure 2.

Figure 2

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4. Draw the output voltage waveform for the bridge rectifier in Figure 3. Notice that all the

diodes are reversed from circuits shown earlier in the chapter.

Figure 3

5. A certain full-wave rectifier has a peak output voltage of 30V. A 50μF capacitor-input

filter is connected to the rectifier. Calculate the peak-to-peak ripple and the dc output

voltage developed across a 600Ω resistance.

6. What value of filter capacitor is required to produce a 1% ripple factor for a full-wave

rectifier having a load resistance of 1.5kΩ? Assume the rectifier produces a peak output

of 18V.

7. Determine the output voltage waveform for each circuit in Figure 4.

Figure 4

8. Determine the RL voltage waveform for each circuit in Figure 5.

Figure 5

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9. Determine the output voltage waveform for each circuit in Figure 6.

Figure 6

10. Describe the output waveform of each circuit in Figure 7. Assume the RC time constant

is much greater than the period of the input.

Figure 7

11. Repeat problem 10 with the diodes turned around.

The American University in Cairo – School of Sciences and Engineering – Department of Physics

12. To what value must R be adjusted in Figure 8 to make IZ = 40 mA? Assume VZ = 12 V at

30 mA and ZZ = 30 Ω.

Figure 8

13. A loaded zener regulator is shown in Figure 9. VZ = 5.1 V at IZ = 49 mA, IZK = 1 mA,

ZZ = 7 Ω and IZM = 70 mA. Determine the minimum and maximum permissible load

currents.

Figure 9

14. Analyze the circuit in Figure 9 for percent line regulation using an input voltage from

6 V to 12 V with no load. Refer to Chapter 2, Equation 2-14 in your textbook.

The American University in Cairo – School of Sciences and Engineering – Department of Physics

Attachments: Introduction to Electronics – PHYS2211 Fall Semester 2015 Assignment #2 Due date: November 4th, 2015 1. Draw the output voltage waveform for each circuit Figure 1 and include the voltage values. Figure 1 2. A power-supply transformer has a turns ratio of 5:1. What is the secondary voltage if the primary is connected to a 120 V rms source? 3. Find the average value of each voltage in Figure 2. Figure 2 The American University in Cairo – School of Sciences and Engineering – Department of Physics 4. Draw the output voltage waveform for the bridge rectifier in Figure 3. Notice that all the diodes are reversed from circuits shown earlier in the chapter. Figure 3 5. A certain full-wave rectifier has a peak output voltage of 30V. A 50μF capacitor-input filter is connected to the rectifier. Calculate the peak-to-peak ripple and the dc output voltage developed across a 600Ω resistance. 6. What value of filter capacitor is required to produce a 1% ripple factor for a full-wave rectifier having a load resistance of 1.5kΩ? Assume the rectifier produces a peak output of 18V. 7. Determine the output voltage waveform for each circuit in Figure 4. Figure 4 8. Determine the RL voltage waveform for each circuit in Figure 5. Figure 5 The American University in Cairo – School of Sciences and Engineering – Department of Physics 9. Determine the output voltage waveform for each circuit in Figure 6. Figure 6 10. Describe the output waveform of each circuit in Figure 7. Assume the RC time constant is much greater than the period of the input. Figure 7 11. Repeat problem 10 with the diodes turned around. The American University in Cairo – School of Sciences and Engineering – Department of Physics

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