Electronics Engineering_ Laboratory-Experiment-11 PDF

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EENG 50Electrical Circuits 1Laboratory Experiment # 11Forced and Natural Response of RL circuits with DC excitationINTRODUCTION/ THEORETICAL INFORMATIONFigure 11 InductorFigure 11Figure 11the function generator and readjust the time per division and the voltage per divisionof the oscilloscope to fit...

Description

EENG 50 Electrical Circuits 1 Laboratory Experiment # 11 Forced and Natural Response of RL circuits with DC excitation

INTRODUCTION/ THEORETICAL INFORMATION

Figure 11.a Inductor

Figure 11.b

Figure 11.c

OBJECTIVES

 To analyze the effect of energy storing devices like inductors in DC circuits.  To demonstrate the charging and discharging response of a inductor with DC excitation.  To verify the natural response and forced response of a DC excited RL circuit.  To distinguish among the natural response, forced response and complete response of a dynamic RL circuit. MATERIALS  PROTO circuit simulator For f2f lab materials 1pc Circuit trainer kit (EEC471-2 and EEC 470) 1pc Circuit Trainer power supply (Feedback Power supply) 1pc Function Generator 1pc Oscilloscope 1pc Electronic V.O.M.

PROCEDURE 1. Assemble the circuit as shown in the figure 11.1 (Refer to the connection set – up of the appropriate trainer).

Figure 11.1

2. Initially set the switch to the discharge position before the turning on the power supply to discharge any energy stored by the inductor. 3. Connect the function generator unit to the main power supply line. Do not switch on the function generator. Check the circuit connection before switching on the power supply. 4. Ensure that the output voltage of the function generator is set and adjusted to a square wave with relative amplitude and an appropriate frequency then connect the supply to the circuit. 5. Calibrate the oscilloscope then use the available channels 1 or 2 to the circuit shown in figure 11.1. 6. Slide the switch from the off position to charging/ on position that is connected

the function generator and readjust the time per division and the voltage per division of the oscilloscope to fit the waveform into the output screen. 7. Measure the voltage readings for 10 second using the oscilloscope. Measure the voltage waveform readings for the span of 1 min. and 20 seconds interval for the next minute. 8. Compute for the current using the formula below and record current readings in table 11.1 (charging). VR = VT - VL

IR = VR / R

9. Graph the response of voltage against time by plotting the voltage reading data obtained (table 11.1) as x axis and the time as y axis. 10. The discharging response of the inductor is attained when the input from the function generator drops to 0. Measure the voltage waveform readings from the oscilloscope every 10 seconds for the first minute then every 20 seconds for the net minute. 11. Compute for the currents using the previous formula on procedure 8 and record the current readings in Table 11.2 (discharging) 12. Graph the response of voltage against time by plotting the current reading data obtained (table 11.2) as x axis and the time as y axis.

TABLE OF RESULTS Table 11.1 charging

Table 11.2 discharging

COMPUTATIONS: (use separate sheets)

DISCUSSION: ______________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ _________.

CONCLUSION: ______________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ _______________________________________________ .

Questions and Problems: 1. What are the factors governing inductance? 2. What are the characteristics of the inductor when connected to a DC source? 3. Discuss briefly the different types of capacitors. 4. What are the basic applications of an RL circuit? 5. Define the time constant of an RL circuit? 6. Determine the equivalent inductance when a 10 mH inductor is placed in parallel with series connected 12 mH and 3mH inductors. 7. Find the equivalent inductance when series connected 40 mH and 150 mH inductors are connected in parallel with series connected 0.1H and 0.12H inductors. 8. Determine the time constant of an RL circuit with a resistance R = 20 ohms and a 500mH inductor connected in series with a 10V dc source. 9. Determine the time constant of an RL circuit with a resistance R = 1.5 kohms and a 50mH inductor connected in parallel with a 25V dc source.

EENG 50 – CIRCUITS 1 First Semester A.Y. 2021-2022 Name: ___________________________________

Student No.: _______________

Course / Yr. / Sec.: _________________________

Date: _____________________

RUBRICS for LABORATORY REPORT Laboratory Title: _______________________________________________________________________________ CRITERIA Punctuality

(20 pts)

Presentation of Data Obtain

(30pts)

Excellent

Good

Submits the Laboratory Report exactly on the right time.

Submits the Laboratory Report after the whole class submits their report but within the day of the class.

(20)

(19-11) The data obtained in the experiment was arranged on a table but when graph, it cannot be interpreted close to the topic.

The data obtained in the experiment is presented in a way that it is close to the topic of the experiment. (30)

Interpretation of the Results

The explanation given was related to the topic of the experiment.

(30pts)

(30)

Presentation of the Report Laboratory Format (20)

The report format has met all the requirement. (20)

Final Score:

(29-20) Most of explanation given related to topic of experiment.

the was the the

Needs Improvement Submits the Laboratory Report after the day of the class but not more than 4 days.

Un- acceptable Submits the Laboratory Report a week after the time of the class and onwards.

(10-6)

(5-0)

The data obtained in the experiment was arranged as a list with no distinct arrangement and when graph, it cannot be interpreted close to the topic.

The data obtained in the experiment is no way close to the topic of the experiment.

(19-11)

(10-0)

Some of the explanation given was related to the topic of the experiment.

(29-20)

(19-11)

The report had erasures but the order was intact. (19-11)

The report had plenty of erasures, staple wires were not covered but the order was intact. (10-6)

The explanation given was not related to the topic of the experiment. (10-0) The report format does not meet all the requirement. (50)

Score...