EET-129 LAB 3 RECTIFIERS_23W

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Centennial College *

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Electrical Engineering

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Apr 3, 2024

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Centennial College ELECTRICAL ENGINEERING TECHNICIAN Course: EET-129 Electronics 1 Name(s) (Please Print): Jeremy San Ped ro Student Number(s): 300946762 Date: Click or tap here to enter text. LAB # 3 Rectifiers Objectives: At the end of this lab, the student will be able to: 1- Construct half-wave, full-wave, and bridge rectifier circuits. 2- Compare measured and calculated DC values. 3- Observe and measure each rectifier circuit's output waveforms on the oscilloscope. 4- Plot/ capture the output waveforms of each rectifier circuit. Components needed: Resistors: One 2.2 kΩ Four diodes 1N4004 One transformer, approx. 15 V AC center-tapped (supplied in the lab) NOTE: Be sure to ask your instructor for assistance properly connecting the transformer to the circuit. 1

PROCEDURE: 1- Connect the circuit shown in Fig. 1 (HALF-WAVE RECTIFIER) Fig. 1 2- Measure the AC voltage at the secondary of the transformer. Enter. 29.67V V. 3- Compute using diode second approximation the DC voltage across the load resistor. 12.7 V DC . Show your calculations in the box below. Vp = Square root 2 * Vrms = Square root 2 * 29.67 = 41.96 Vdc =41.96/pi = 13.3V – 0.7 =12.7V 4- Measure the voltage across the load resistor. 12.4V V DC Compare it to your computed value. Difference: 0.3V V DC 2

5- Connect the Oscilloscope so that channel 1 is across the load resistor. The oscilloscope should be set for Channel 1 triggering. Draw the waveform which appears on the display. Label voltage and time on your sketch indicating the setting per division for voltage and time. Note: you can take a picture and write the necessary information on voltage and time on it indicating the setting per division for voltage and time. 6- Connect the circuit shown in Fig. 2. (FULL–WAVE RECTIFIER) Fig. 2 7- Measure the secondary AC voltage of the transformer between the center tap lead and one of the other secondary leads. 14.7 V. 3

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8- Compute using diode second approximation the DC voltage across the load resistor. Enter. 5.9V V DC . Show your calculations in the box below. Vp = Square root 2 * 14.7 = 20.78V Vdc = 20.78/ pi =6.6V – 0.7V 5.914V Full wave = 5.914 * 2 =11.8 V 9- Measure the voltage across the load resistor: 12.38 V DC Compare it to your computed value. Difference: 0.6 V DC 10- Connect the Oscilloscope so that channel 1 is across the load resistor. The oscilloscope should be set for Channel 1 triggering. Draw the waveform which appears on the display. Label voltage and time on your sketch indicating the setting per division for voltage and time. 4

11- Connect the circuit shown in Fig. 3. (BRIDGE RECTIFIER) Fig. 3 12- Measure the AC voltage of the transformer secondary. 29.67 V 13- Compute using diode second approximation the DC voltage across the load resistor. 12.7 V V DC . Show your calculations in the box below. Vp = Square root 2 * Vrms = Square root 2 * 29.67 = 41.96 Vdc =41.96/pi = 13.3V – 0.7(2) 5

=11.9V 11.9 x 2 =23.8 V 14- Measure the voltage across the load resistor. 24.0 V DC Compare it to your computed value. Difference: Enter. 0.2V V DC 15- Connect the Oscilloscope so that channel 1 is across the load resistor. The oscilloscope should be set for Channel 1 triggering. Draw the waveform which appears on the display. Label voltage and time on your sketch indicating the setting per division for voltage and time. 6

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Submission : Your lab must be uploaded in the Assignment Folder -> Lab 3. Your submission must include this document edited with your data. You may add Multisim simulations to your lab (optional). Marks: Mark. /100 7

Conclusion: The conclusion summarizes important points of the laboratory work. You must analyze the examples to add emphasis to significant points. You must also include features and/or things you have done/benefits of a particular procedure, instrument, component, or circuit directly related to the experiment. In this lab, we are furthering our understanding of diodes and its effects on a circuit more specifically its relation towards load voltage across the resistor. With the use of oscilloscopes, we can identify half-wave, full and bridge rectifiers in relation to the number of diodes a present within the circuit. Where it is present, one diode may present a half wave rectifier, two diodes present full wave rectifiers and four display a bride rectifier. These can be concluded that with aspects of diodes in a circuit, may be halved or times by two to identify voltage through a resistor. In conclusion, this lab broadened how we view a circuit and how components may effect the totality of what is to be identified. Marks: Mark. /30 Rubric-Grading: Criteria Max. Grade 8

Punctuality 10 Mark. Following Procedure and Submission 100 Mark. Conclusion 30 Mark. Neatness, Spelling, Grammar and Sentence Structure 10 Mark. Total Mark. /150 9

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Related Questions

In a full-wave rectifier _______________. a) the output is apure DC voltage. b) only the negative half of the input cycle is used. c) only the positive half of the input used. d) the complee input cycle is used.
The purpose of the current limiting resistor in a Zener diode circuit is to _________. a. Maintain a constant current through the load resistor b. Maintain a constant voltage across the Zener diode c. Maintain a constant current through the Zener diode d. Drop the additional voltage from the power supply in order to maintain a constant voltage across the Zener diode Please answer it clearly.
A single phase half wave controlled rectifier has RL load. Write the following a) Draw its circuit diagram and waveform. b) Draw and explain its quadrant operation. Explain why the negative voltage appear across the load. d) Explain how the negative voltage can be removed.

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