ELT 369 - DC & AC Fundamentals Lab

Credits: 3
Lecture Hours: 0
Lab Hours: 6
Practicum Hours: 0
Work Experience: 0
Course Type: Voc/Tech

This laboratory will enable the student to analyze basic L-C-R circuitry. Basic test equipment usage will also be presented.
Prerequisite: ELT 368 must be taken concurrently with or prior to this course
Competencies

Use metric prefixes and scientific notation
1. Convert standard form numbers to scientific and engineering notation
2. Measure quantities using a metric prefix
3. Identify several electronic components
Use laboratory meters and power supplies
1. Read analog meter scales including multiple and complex scales
2. Operate the power supply at the lab station
3. Explain the functions of the controls for the multimeter at the lab station
4. Use the multimeter to make a voltage measurement
Use laboratory equipment to measure and evaluate the resistance of resistors
1. Determine the listed value of a resistor using the resistor color code
2. Use a DMM (or VOM) to measure the values of resistors
3. Determine the percent difference between the measured and listed values of resistors
4. Measure the resistance of a potentiometer and explain its operation
Make voltage measurements
1. Connect a circuit from a schematic diagram
2. Use voltages measured in respect to ground to compute the voltage drop across a resistor
3. Explain the meaning of circuit ground and subscripts used in voltage definitions
Use Ohm’s law
1. Measure the current-voltage curve for a resistor
2. Construct a graph for the current-voltage of a resistor
3. Determine the resistance of a resistor from a current-voltage graph
Calculate power in dc circuits
1. Determine the power in a variable resistor at various settings of resistance
2. Plot data for power as a function of resistance and from the plot, determine when maximum power is delivered to the variable resistor
Connect and evaluate series circuits
1. Use Ohm’s law to find the current and voltages in a series circuit
2. Apply Kirchoff’s voltage law to a series circuit
Connect and evaluate a voltage divider
1. Apply the voltage divider rule to series resistive circuits
2. Design a voltage divider to meet a specific voltage output
3. Confirm by measurements the voltage divider circuit you designed
4. Determine the range of voltages available when a variable resistor is used in a voltage divider
Connect and evaluate parallel circuits
1. Demonstrate that the total resistance in a parallel circuit decreases as resistors are added
2. Compute and measure resistance and currents in parallel circuits
3. Explain how to troubleshoot parallel circuits
Connect and evaluate series-parallel combination circuits
1. Use the concept of equivalent circuits to simplify series-parallel circuit analysis
2. Compute the currents and voltages in a series-parallel combination circuit and verify the computations with circuit measurements
Use the superposition theorem
1. Apply the superposition theorem to linear circuits with more than one voltage source
2. Construct a circuit with two voltage sources, solve for the currents and voltages throughout the circuit, and verify the computations with measurement
Use Thevenin’s theorem
1. Change a linear network containing several resistors into an equivalent Thevenin circuit
2. Prove the equivalency of the network in 12.1 by comparing the effects of various load resistors
Use a Wheatstone bridge
1. Calculate the equivalent Thevenin circuit for a Wheatstone bridge circuit
2. Verify that the Thevenin circuit determine in 13.1 enables you to compute the response to a load for the original circuit
3. Balance a Wheatstone bridge and draw the Thevenin circuit for the balanced bridge
Use an oscilloscope
1. Draw the four functional blocks of an oscilloscope and describe the major controls within each block
2. Use an oscilloscope to measure ac and dc voltages
Make sine wave measurements with an oscilloscope
1. Measure the period and frequency of a sine wave using an oscilloscope
2. Measure across ungrounded components using the difference function of an oscilloscope
Use capacitors in basic circuits
1. Compare total capacitance, charge, and voltage drop for capacitors connected in series and in parallel
2. Test capacitors with an ohmmeter and a voltmeter
Measure capacitive reactance
1. Measure the capacitive reactance of a capacitor at a specified frequency
2. Compare the reactance of capacitors connected in series and parallel
Use inductors in basic circuits
1. Describe the effect of Lenz’s law in a circuit
2. Measure the time constant of an LR circuit and test the effect of series and parallel inductances on the time constant
Measure inductive reactance
1. Measure the inductive reactance of an inductor at a specified frequency
2. Compare the reactance of inductors connected in series and parallel
Connect and evaluate series RC circuits
1. Compute the capacitive reactance of a capacitor from voltage measurements in a series RC circuit
2. Draw the impedance and voltage phasor diagrams for a series RC circuit
3. Explain how frequency affects the impedance and voltage phasors in a series RC circuit
Connect and evaluate parallel RC circuits
1. Measure the current phasors for a parallel RC circuit
2. Explain how the current phasors and phase angle are affected by a change in frequency for parallel RC circuits
Connect and evaluate series RL circuits
1. Compute the inductive reactance of an inductor from voltage measurements in a series RL circuit
2. Draw the impedance and voltage phasor diagrams for the series RL circuit
3. Measure the phase angle in a series circuit using either of two methods
Connect and evaluate parallel RL circuits
1. Determine the current phasor diagram for a parallel RL circuit
2. Measure the phase angle between the current and voltage for a parallel RL circuit
3. Explain how an actual circuit differs from the ideal model of a circuit
Connect and evaluate series resonant circuits
1. Compute the resonant frequency, Q, and bandwidth of a series resonant circuit
2. Measure the parameters listed in 24.1
3. Explain the factors affecting the selectivity of a series resonant circuit
Connect and evaluate a parallel resonant circuit
1. Compute the resonant frequency, Q, and bandwidth of a parallel resonant circuit
2. Measure the frequency response of a parallel resonant circuit
3. Use the frequency response curve to determine the bandwidth of a parallel resonant circuit