ECT 125 Week 1 Homework
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Homework Assignment
Chapter 10
2.) Calculate the value ofvLdeveloped across a 4.7 H coil when the instantaneous rate of change in component current equals 1.5 A/s.
4.) Calculate the value ofvLdeveloped across a 470 ﾵH coil when the instantaneous rate of change in component current equals 2 mA/ﾵs.
6.) Calculate the value of the air-core inductor shown
8.) Calculate the value of the iron-core inductor shown
10.) The coils showhave a value ofk= 0. Calculate the total inductance in the circuit
Chapter 12
2.) A capacitor is storing 100 ?C of charge when the difference of potential across its plates is 40 V. Calculate the value of the component.
4.) Determine the charge that a 100 pF capacitor stores when the difference of potential across its plates is 25 V.
6.) Calculate the total capacitance in the series circuit shown
8.) Calculate the total capacitance in the series circuit shown
10.) Calculate the total capacitance in the parallel circuit shown
Chapter 16
2.) Determine the time constant for the circuit shown
4.) Determine the time required for the current in the circuit shownto reach its peak value.
6.) An RL switching circuit has values of R= 33 ?, L= 100 ?H, andIpk= 75 mA. Determine the value of the circuit current (It) at the following times
8.) Determine the time required forVRto reach 18 V on the rise curve
10.) Determine the time constant for the circuit shown
12.) Determine the time required forVC in the circuit shownto reach its peak value
14.) An RC switching circuit has values of R= 120 ?, C= 47 ?F, andVpk = 8 V. Determine the value of VC at the following times
16.) Refer to the following figure. Determine the time required forVCto reach 15 V on its rise curve
ECT 125 Week 1 iLab 1
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ECT 125 ECT\125 ECT 125 Week 1 iLab 1
ECT 125 Week 1 iLab 2
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ECT 125 ECT\125 ECT 125 Week 1 iLab 2
ECT 125 Week 2 Homework
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Chapter 9.
2. Calculate the period of the waveform shown in Figure 9.45
4. Calculate the period of the waveform shown in Figure 9.46b
6. Calculate the frequency of the waveform shown in Figure 9.45.
ECT 125 Week 2 iLab Triangles and the Pythagorean Theorem
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ECT 125 ECT\125 ECT 125 Week 2 iLab Triangles and the Pythagorean Theorem
ECT 125 Week 3 Homework
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Calculate total impedance (ZT) and voltage values (VR, VL, VC) for the circuit shown below where the voltage source values are: v = 4V, f = 800 Hz.
ECT 125 Week 3 iLab 2 Inductor Phase Shift
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Inductor Phase Shift
iLab Steps
Part I: Phase Shift Measurement
1.Construct the circuit shown below on your breadboard.
2.Set the function generation to provide a 1 VRMS amplitude sine wave at 500 Hz. Measure the inductor voltage and the phase shift between the source and inductor voltage.
Part II: Time and Voltage Measurement
1.Construct the circuit shown below on your breadboard.
2.Set the function generation to provide a 1 VRMS amplitude sine wave at 200 Hz. Measure the inductor voltage and the phase shift between the source and inductor voltage. Note whether the phase shift is ahead of or behind the source.
ECT 125 Week 3 iLab 3 Phase Shift and Voltage
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ECT 125 ECT/125 ECT 125 Week 3 iLab 3 Phase Shift and Voltage
ECT 125 Week 4 Homework
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Chapter 11, Page 349-350, problems 20, 22, 24, 26, 30 and 32
20. A parallel RL circuit has values of IL= 240mA and IR = 180mA. Calculate the magnitude and phase angle of the circuit current.
22. Calculate the total impedance for the circuit shown in Figure 11.38b.
24. Calculate the magnitude and phase angle of the circuit impedance shown in Figure 11.39b.
26. Calculate the component current and power values for the circuit in Figure 11.40b. Then, calculate the values of IT and PAPP.
30. The voltage source in Figure 11.42b has the frequency limits shown. Calculate the circuit current and impedance values at the frequency limits of the source.
32. Refer to problem 24. Express the circuit impedance in rectangular form.
Chapter 13, Pages 409-411, problems: 22, 24, 26, 28, 30, and 32
22. A parallel RC circuit has values of IC = 320mA and IR = 140mA. Calculate the magnitude and phase angle of the circuit current.
24. Calculate the magnitude of ZT for the circuit shown in Figure 13.37b.
26. Calculate the magnitude and phase angle of the circuit impedance in Figure 13.38b.
28. Calculate the impedance, current and power values for the circuit in Figure 13.39b.
30. The voltage source in Figure 13.40b has the frequency limits shown. Calculate the circuit current and impedance values at the frequency limits of the source.
32. Refer to problem 26. Express the circuit impedance in rectangular form.
Chapter 14, Pages 445-447, problems: 12, 14, 28, and 30
12. Determine the magnitude and phase angle of the circuit current shown in Figure 14.41b.
ECT 125 Week 4 iLab 1
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iLab Steps
Part I: Power Ratings
Step 1: Power Rating Observation and Notation
1.Locate the safety sticker on the equipment in the laboratory. Examine the power rating of the equipment. Complete the table below for the equipment listed below as well as any other equipment in the room.
2.Assuming the equipment is connected to standard 120 VRMSwall outlets, list the maximum current for each device.
3.Typical circuit breakers allow a maximum of 15 Amperes before tripping. Determine how many of each of these devices could be connected to the same breaker without tripping.
ECT 125 Week 4 iLab 2
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ECT 125 ECT/125 ECT 125 Week 4 iLab 2
ECT 125 Week 4 iLab 3
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ECT 125 ECT/125 ECT 125 Week 4 iLab 3
ECT 125 Week 5 Homework
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Chapter 11
34. Calculate the current and voltage values for the circuit shown in Figure 11.43b.
Chapter 13
34. Calculate the current and voltage values for the circuit shown in Figure 13.41b.
Chapter 14
32. Calculate the impedance, current and voltage values for the circuit shown in Figure 14.50b.
38. Calculate the impedance, current and voltage values for the circuit shown in Figure 14.51b.
ECT 125 Week 5 Homework
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ECT 125 Week 5 iLab 1
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iLab Steps
Part I:Inductor in Series with Parallel Combination of Capacitor and Resistor
1.Construct the series-parallel circuit shown on your breadboard.
2.Determine the total circuit impedance (including phase) for the circuit.
ECT 125 Week 5 iLab 2
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iLab Steps
Part I:Capacitor in Series with Parallel Combination of Inductor and Resistor
1.Construct the series-parallel circuit shown on your breadboard.
2.Determine the total circuit impedance (including phase) for the circuit.
3.Determine the total circuit current (including phase) for the circuit.
ECT 125 Week 5 iLab 3
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Series-Parallel Circuits III
Lab is due Week 5
Scenario/Summary:
This lab is one exercise as follows:
This lab entails constructing a series-parallel circuit (series resistor and inductor with parallel resistor and capacitor) and measuring and observing circuit properties. Questions to answer are embedded in the procedure.
This lab can be accomplished on a physical breadboard or in MultiSim.
Deliverables:
Questions associated with each part of the lab.
ECT 125 Week 6 Homework
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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 6 iLab 1
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ECT 125 ECT/125 ECT 125 Week 6 iLab 1
ECT 125 Week 6 iLab 2
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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 iLab 3
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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 7 Homework
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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 7 iLab 1
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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 iLab 1
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ECT 125 ECT\125 ECT 125 Week 7 iLab 1
ECT 125 Week 7 iLab 2
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ECT 125 ECT\125 ECT 125 Week 7 iLab 2
ECT 125 Week 7 iLab 2
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iLab Steps
Exercise: Step-up Transformer Circuits
1.Construct the circuit shown below on the breadboard.
2.Given the transformer turns ratio by your Instructor calculate the expected secondary and primary voltage and currents. (note: Source voltage will need to be increased with the transformer reversed to yield the desired 1 V. Measure primary voltage and increase source until 1 V is reached.)
5.Calculate the expected primary impedance according to theory and the measured primary impedance by taking the ratio of the primary voltage and current.
ECT 125 Week 7 iLab 3
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ECT 125 Week 7 iLab 3
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ECT 125 ECT/125 ECT 125 Week 7 iLab 3
ECT 125 Week 1 Quiz
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1. (TCO 1) Calculate the time constant and how long will it take the capacitor in the following circuit to become fully charged
2. (TCO 2) Current . Transfer this current to the polar notation.
3. (TCO 1) How long does it take a capacitor to fully discharge in an RC circuit?
4. (TCO 3) Calculate current (I) for the circuit shown.
ECT 125 Week 6 Quiz
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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 ____________.