This library consists of 12 interactive, on-line lessons. 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 library 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.

Introduction to Electricity


Basic Electrical Properties


Series Circuits


Parallel Circuits


Alternating Current


Electromagnetism


Inductance


Capacitance


Three-Phase Circuits


Wye and Delta Connections


Introduction to Transformers


Transformers

• Describe the atomic structure of matter.
• Describe the characteristics of good conductors and insulators.
• Define electricity.
• Describe how a simple circuit operates.

• Define voltage.
• Define current.
• Define 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 Learningh, 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 and current behave in a parallel circuit.
• Describe how resistance behaves 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.
• Explain how a capacitor becomes discharged.
• Explain how capacitance affects AC circuits.

• Define 3-phase AC.
• 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 related 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.
• Apply the formula that shows the relationship between phase and line currents in a 3-wire wye connection.
• Apply the formula that shows the relationship between phase voltage and single-phase load voltage in a 4-wire wye connection.
• Describe the the relationship between phase and line voltages in a delta connection.

• Identify and describe the functions of the basic transformer parts.
• Explain the relationship between a transformer’s turns ratio and its input and output voltages.
• Describe the danger in reversing or stepping-up the voltage.

• Given the secondary voltage and load, determine the primary current.
• Given the primary voltage and load, determine the secondary current.
• Given the turns ratio and voltage and current from either the primary or secondary, determine the power.
• Given power and primary voltage, determine primary current.
• Given primary voltage, determine secondary voltage in a 3-phase transformer.
• Describe the configuration of a 3-phase transformer.
• State some applications and maintenance precautions for a 3-phase transformer.
• Explain the functions and uses of multi-tap transformer and autotransformers.