Online Direct Current eLearning

DC Power Supplies Fundamental Concepts ...the purpose, function, and elements of the ubiquitous DC (direct current) power supply. Modern electronic devices generally require low-voltage DC sources to power their circuits. Some devices use battery or even solar power, but all others need a DC power supply, typically connected to a house or office AC (alternating current) wall outlet. These include radios, stereo systems, TV, computers,  more...

Introduction to Batteries ...en it is needed, so batteries are used in instances where direct current is needed and/or there is no access to a power outlet, or a cord becomes cumbersome. A battery is a device where chemical energy is converted to electrical energy. Many different types of batteries are available for a wide variety of applications, from storing solar power for satellites in space to powering heart  more...

Power Factor Correction ...ection. 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 circuit elements. Waveforms and their relationship to vectors are shown. Line voltage drops and line power losses are  more...

Industrial Motor Control ...motors are addressed. Both Alternating Current motors and Direct Current motors are covered. All in all, this is a very nice coverage of a subject that is often overlooked in our educational systems. This course was designed for electrical engineers as well as engineers of other disciplines. Electrical engineers will have a deeper understanding of how motors are controlled. Engineers from  more...

Introduction to Matter Energy and Electricity ...ing Series; Module-1 ? Introduction to matter, energy and direct current? and covers Chapter 1. The student must take a multiple-choice quiz consisting of twenty-five (25) questions at the end of this course to obtain PDH credits. State Board Acceptance This course can be used by professional engineers to fulfill PDH requirements mandated by state and provincial licensing boards. Decatur  more...

Reactance in AC Circuits - Fundamental Concepts ...g current. Reactance also occurs for short intervals when direct current is changing as it approaches or departs from steady flow (e.g., when switches are closed or opened). Reactance is of two types, inductive and capacitive. Inductive reactance (symbol XL) is associated with the varying magnetic field that surrounds a wire or a coil carrying a current. The more rapidly the current  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.  more...

Direct Current Motors and Generators ...direct current generator, or DC generator, produces a voltage of constant polarity, which means the voltage and current do not change over time. DC generators are basically AC generators whose output voltage is switched the other way around at the proper moment, so that the direction of the voltage is always in a single direction. The AC generator uses slip rings to transfer the current to the  more...

Direct Current Circuits Fundamentals ...ts of electricity begin their study with what is known as direct current (DC). This is different than static electricity, which typically collects on the surface of a non-conductor such as a piece of plastic. It is also different than alternating current (AC) electricity, which flows back-and-forth in a conductor. In DC circuits, the polarity of the voltage source and current does not change  more...