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