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.

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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.

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