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# Electrical Theory for Troubleshooters

## Overview

These lessons are excellent for the training of electricians and electronic technicians as well as for the multi-craft training needs of process and manufacturing facilities. The first four lessons in this course cover basic electrical concepts including Ohm’s Law and Kirchhoff’s Law, as well as the use of these laws to determine voltage, current, and resistance in series and parallel circuits.

## Objectives

• Describe the atomic structure of matter.
• Describe the characteristics of good conductors and insulators.
• Define electricity.
• Describe how a simple circuit operates.
• Define voltage, current, and resistance.
• Describe voltage and current relationships.
• State Ohm’s Law.
• Use Ohm’s Law to calculate an unknown value.
• Define power and how to use power values with Ohm’s Law.
• Define a series circuit.
• Properly identify simple schematic symbols for a battery, swITC Learning, lamp, resistor, and conductor.
• Describe how current and resistance behave in a series circuit.
• Describe how voltage behaves in a series circuit.
• Use Kirchhoff’s Voltage Law to find total voltage in a series circuit.
• Describe how voltage, current, and resistance behave in a parallel circuit.
• Identify the series portions of a series-parallel circuit.
• Identify the parallel portions of a series-parallel circuit.
• Simplify a series-parallel circuit to determine how voltage, current and resistance behave.
• State the basic operating AC Characteristics of voltage.
• Explain how AC voltage changes over time.
• Define sine wave and cycle.
• Interpret the frequency of AC voltage using a sine wave.
• Explain RMS voltage vs. peak voltage.
• Describe the principles of magnetism.
• Describe flux and flux density.
• Describe how electromagnetic induction takes place.
• Describe how a magnetic field is generated by passing current through a conductor.
• Plot a sine wave using a graph.
• Describe how a magnetic field is generated by passing current through a conductor.
• Explain self-induction.
• Explain counter-electromagnetic field.
• Describe how current is induced in a coil-type conductor.
• Explain mutual induction.
• Explain the principle of transformer function.
• Explain the function of a tap in transformer construction.
• Describe the effect of inductance in AC circuits.
• Define capacitance and identify its schematic symbol.
• Explain how a capacitor becomes charged and discharged.
• Explain how capacitance affects AC circuits.
• Define 3-phase AC and differentiate between 3-phase and 1-phase AC.
• Describe the components and operating principle of a 3-phase generator.
• Use a sine wave to show how 3-phase voltage changes over time.
• Explain the relationship between frequency and rotor speed.
• State and apply the formula for frequency.
• Describe how rotor speed and the number of poles relate to frequency.
• Describe the relationship between phase and line voltages in a 3-wire wye connection.
• Describe the relationship between phase and line voltages in a 4-wire wye connection.
• Describe the relationship between phase and line currents in a delta connection.
• Calculate power in a 3-phase load.
• Describe the relationship between phase and line voltages in a delta connection.
• Identify and describe the functions of the basic transformer parts.
• Explain relationship between a transformer’s turns ratio and input and output voltages.
• Describe the danger in reversing or stepping-up the voltage.

## Modules

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