Online Basic Ac Circuit Theory eLearning

Introduction to Capacitance Capacitance is the property of an electric conductor that characterizes its ability to store an electric charge. An electronic device called a capacitor is designed to provide capacitance in an electric circuit by providing a means for storing energy in an electric field between two conducting bodies. A capacitor in its simplest form consists of two conducting plates separated by an insulating  more...

Power Factor Correction This course was written with the intention of removing the magic and mystique that surrounds the idea of Power Factor Correction. With that in mind, the course starts by reviewing direct current and single phase alternating current circuits, including resistive, capacitive, and inductive circuits. This is a quick review emphasizing voltage, current, and power relationships in these three common  more...

DC Circuit Switching Transients This course is intended to benefit engineers who design, use, inspect, or repair circuits that contain DC power sources and accompanying DC components. Application of DC circuits includes control, instrumentation, and motor excitation. Whereas both AC and DC circuits as well as transmission lines are susceptible to transient phenomena, DC components are particularly subjected to transients  more...

Power System Neutral Grounding Fundamentals Overview One of the most critical decisions faced by the designer of a power system is how the neutral of the system should be grounded. This course presents the subject of neutral grounding in a very structured fashion. First, a simple equivalent circuit is developed for a generic power system, and then each of the options for neutral grounding is ?tested? in that equivalent circuit to  more...

Introduction to Matter Energy and Electricity Have you ever wondered about all the material or matter around us? What is it? Is there any universal explanation for its appearance, properties, and behavior? One theory that explained some of the properties of matter was the molecular theory of matter, which states that matter consists of small molecules in motion. This theory provides an explanation of many characteristics of matter,  more...

Reactance in AC Circuits - Fundamental Concepts Reactance is the measure of the opposition to the flow of alternating current caused by the inductance and capacitance in a circuit rather than by resistance. Steady electric currents flowing along conductors in one direction undergo opposition called electrical resistance, but no reactance. Reactance is present in addition to resistance when conductors carry alternating current. Reactance also  more...

Basic Direct Current DC Theory Direct current or DC electricity is the continuous movement of electrons from an area of negative (-) charges to an area of positive ( ) charges. A DC circuit is necessary to allow the current or stream of electrons to flow. Such a circuit consists of a source of electrical energy (such as a battery) and a conducting wire running from the positive end of the source to the negative terminal. DC  more...

Fuses and Circuit Breakers Overview There are two basic methods of circuit protection. They are fuses and circuit breakers. There are many variations of fuses and circuit breakers. This course attempts to explain how and why fuses and circuit breakers work. There is some basic theory upon which these devices are designed. There is an explanation of some of the terms that are applied to fuses and circuit breakers and why  more...

Instrumentation and Control Temperature Pressure Flow Level and Position Indication Overview Instrumentation is the art of measuring the value of some plant parameters, for example, temperature, pressure, flow, or level to name a few, and supplying a signal that is proportional to the measured parameter. The output signals are standard signals and can then be processed by other equipment to provide indication, alarms or automatic control. This course covers five modules  more...