Augusta Technical College ELT 119

The Electrical Trade
Instructors
Program Description
Equipment
MAT 101 General Mathematics
ELT 106 Electrical Prints
ELT 107 Commercial Wiring I
ELT 108 Commercial Wiring II
ELT 109 Commercial Wiring III
ELT 111 Single-Phase and Three-Phase Motors
ELT 112 Variable Speed/Low Voltage Controls
ELT 118 Electrical Controls
IFC 101 Direct Current Circuits I
SCT 100 Intro to Microcomputers

ELT 119

Course Description

Introduces the theory and application of varying sine wave voltages and current. Topics include: magnetism, AC wave generation, AC test equipment, inductance, capacitance, and basic transformers.

Competency Areas	Hours
Magnetism	Class	3
AC Wave Generation	D. Lab	2
AC Test Equipment	P. Lab/O.B.I.	0
Inductance	Credit	4
Capacitance
Basic Transformers

Prerequisite:	IFC 100
Corequisite:	IFC 101, MAT 101

Course Guide

Competency	After completing this section, the student will:
Magnetism
Magnetism	Explain the principles of magnetism. Demonstrate magnetic principle application.
AC Wave Generation
Sine wave	Describe sine waves generated by alternating current.
Alternating current	Define alternating current.
Voltage and current values	Measure AC voltage and current values.
Alternating voltage generator	Describe basic AC generator principles.
AC Test Equipment
Oscilloscope use	Explain oscilloscope control functions.
Frequency and period	Calculate and measure AC sine wave frequency and period. Use an oscilloscope for sinusoidal wave form voltage, period, and/or frequency measurements.
Harmonics	Measure harmonics using a harmonic meter or analyzer.
Inductance
Inductors	Define inductance and identify inductor symbols. Explain inductor operation. Demonstrate the effect of connecting inductors in series and in parallel. Draw a vector diagram showing inductor's phase relationships of voltage and current. Determine the inductance value of an inductor. Define and determine the reactance of an inductor when given the inductance and the frequency.
Capacitance
Capacitors	Define capacitance and identify capacitor symbols. Explain capacitor operation. Demonstrate the effect of connecting capacitors in series and in parallel. Draw a vector diagram showing voltage and current phase relationships. Determine the capacitance value of a capacitor. Define and determine the reactance of a capacitor when given the capacitance and frequency.
Basic Transformers
Terminology	Apply, define, and explain fundamental electrical terminology and electrical parameters for transformers.
Mutual inductance	Explain transformer outputs in relation to inputs.
Core losses	Explain core losses, mutual inductance, and types of transformers.
Impedance	Use an oscilloscope for transformer voltage and phase measurements.
Multiple-winding transformers	Calculate voltage-turns ratio. Calculate voltage-current ratio. Determine impedance matching.
Types of transformers	Test and identify transformers. Describe the impact of harmonics on transformers, heating core losses, hysteresis, and copper loss (skin effects).