# ECT 125 Week 7 iLab 1 Updated

ECT 125 Week 7 iLab 1 Updated

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ECT 125 Week 7 iLab 1 Updated

Step-down Transformers

Lab is due Week 7

Scenario/Summary:

This lab is one exercise as follows:

This lab entails constructing a transformer circuit and measuring and observing circuit properties. Questions to answer are embedded in the procedure.

All parts of the lab can be accomplished on a physical breadboard or in MultiSim.

Deliverables:

Questions associated with each part of the lab.

# ECT 125 Week 7 Homework Updated

ECT 125 Week 7 Homework Updated

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ECT 125 Week 7 Homework Updated

ECT 125 HW#7 — 1 August 19, 2014 NAME:

1. A transformer with a 250mA AC primary current and a 4:1 turns ratio has a secondary current of?

1 A 250 mA

4 A

400 mA

None of the above

2. A transformer that has 1500 windings around the core for the primary and 250 secondary windings will have a turns ratio of ___ to 1.

3. A transformer with a 40-V AC primary voltage and a 3:5 turns ratio has an output voltage of

24 V

40 V

4 V

66.7 V

4. If a transformer has a turns ratio of 1: 5 and a secondary voltage of 20 V AC, the primary voltage will be?

5 V

20 V

1.25 V

80 V

None of the above

5. A resistive load of 500 Ohm is connected across the secondary windings of a 2:1 transformer. If the primary voltage is 50 V AC, what will be the secondary current?

100 mA

2 mA

50 mA 1 mA

None of the above

# ECT 125 Week 6 Quiz Updated

ECT 125 Week 6 Quiz Updated

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ECT 125 Week 6 Quiz Updated

1. (TCO 5) If Va = 2V, what is Vout?

2. (TCO 3) If Vin = 2V, and Rload = 1k ohm, what is the current through Rload?

3. (TCO 4) If an audio amplifier integrated circuit uses a dual power supply of +/- 30V for the power supply, will there be a capacitor on the output of the audio amp? Why or why not?

4. (TCO 7) Positive feedback causes ______.

5. (TCO 6) The filter below left is a ________ pass filter, and it is made with one RC circuit the maximum rolloff will be ________ db/decade.

6. (TCO 2) For the circuit below, if Vcc is 50 volts and Rb is 4.3k ohms, find the base and collector voltages and currents for an input of 0V and 5V. Beta = 300, the motor resistance is 500

7. (TCO 1) Find the following for an input of 120 VAC(RMS), 60 hertz, given a 6:1 stepdown transformer, and a full-wave bridge rectifier. Rload is 70 ohms. Round off to the nearest tenths place.

4a: Primary or input peak voltage =

4b: Secondary peak voltage =

4c: Peak voltage out of the rectifier =

4d: DC voltage out of the rectifier =

4e: DC current into the load =

8. (TCO 5) If the resistance of the thermistor is 900 ohms, what is Vout? Is the motor on or off?

9. (TCO 6) For the circuit below, this is a _______ pass filter. The resonant

Frequency is _________.

10. (TCO 6) For the filter below, if C = .005ufd, this is a _________ pass filter with a roll-off of ______ db/decade and a cutoff frequency of ____________.

# ECT 125 Week 6 iLab 3 Updated

ECT 125 Week 6 iLab 3 Updated

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ECT 125 Week 6 iLab 3 Updated

iLab Steps

Part I: Bandpass or Notch?

1.Construct the circuit shown below on the breadboard.

2.Use the techniques described in the lecture to predict which type of filter the circuit above will be.

Part II: Bandpass or Notch?

1.Construct the circuit shown below on the breadboard.

2.Use the techniques described in the lecture to predict which type of filter the circuit above will be.

4.From the above results predict the upper and lower cut-off frequencies.

# ECT 125 Week 6 iLab 2 Updated

ECT 125 Week 6 iLab 2 Updated

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ECT 125 Week 6 iLab 2 Updated

iLab Steps

Part I: RC Low and High Pass Filters

1.Construct the circuit shown below on the breadboard.

2.Vary the frequency from minimum to maximum frequencies and observe the input and output waveforms on the oscilloscope. What happened to the phase of the capacitor voltage when the frequency was changed?

3.Measure the output voltage and phase for each of the frequencies shown below. Make sure to keep the amplitude a 1 V for each of your measurements.

4.Plot the output voltage versus frequency using Excel. Based on your measurements, which type of filter is this circuit?

Part II: RL Low and High Pass Filters

1.Construct the circuit shown below on the breadboard.

8.If using ELVIS, plot the output voltage versus frequency using the Bode plotter utility. Use the same frequency range as in the first part. Which type of filter is this circuit?

# ECT 125 Week 6 Homework Updated

ECT 125 Week 6 Homework Updated

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ECT 125 Week 6 Homework Updated

Chapter 14, Page 445, problems: 16 and 18

Chapter 15, Pages 487–488, problems: 2, 4, 6, 8, 20, 22, 24, 26, 28, 30, 32, 34, 36, and 38

# ECT 125 Week 5 iLab 2 New

ECT 125 Week 5 iLab 2 New

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ECT 125 Week 5 iLab 2 New

iLab Steps

Part I:Capacitor in Series with Parallel Combination of Inductor and Resistor