Module 2 basic dc theory this module describes the basic concepts of direct current dc electrical circuits and discusses the associated terminology. Download source files for this volume approximately 31 megabytes approximately 2. The primary voltage is 20 times greater than that of the secondary. Then all basic electrical or electronic circuits consist of three separate but very much. Direct current an electric current flowing in one direction only i. The most fundamental law in electricity is ohms law or vir. Completely updated to reflect the 2017 national electrical code. Label dc direct current is usually used for such quantities and capital letters are used for symbols, e. An overview of the theory and practice of electrical circuits including calculations as applied to alternating and direct current.
Electrical science module 2 basic dc theory ntc sites. The currents i2 and i3 and the unknown resistance, r can all be calculated, using basic dc theory. Includes calculations as applied to alternating and direct current. Provides a comprehensive, contentfilled introduction to basicelectrical theory, circuit fundamentals, and practical wiring techniques. Basic electrical power fundamentals load reference kilowatts kilovolt amps power factor pf motors kw kva use nec 430148 kw electrical science handbook consists of fifteen modules that are contained in four volumes. With our online resources, you can find basic electrical engineering by dc kulshreshtha or just about any type of. The direction of current flow is as indicated by the arrows. Learn basic electrical theory with free interactive flashcards. Introduction electric circuit theory and electromagnetic theory are the two fundamental theories upon which all branches of electrical engineering are built.
The following is a brief description of the information presented in each module of the handbook. Complete the record sheet in the back of this booklet and submit it as instructed by county 4h youth educator or 4h electric leader. Build an intuitive understanding of current and voltage, and power. Module 1 basic electrical theory this module describes basic electrical concepts and introduces electrical terminology. This force may be illustrated with lines as shown in figure. When we see a value such as 10 volts, it is a measurement of the potential difference between two. This is the only book on the market that has been conceived and deliberately written as a onesemester text on basic electric circuit theory. Residential electrical wiring, residential plumbing, and 3d design and construction modeling. Lessons in electric circuits volume i dc table of contents. Mike holt worked his way up through the electrical trade from apprentice electrician through electrical contractor, to become one of the most recognized experts in the world as it relates to electrical power installations. Understand the requirements and configurations of electrical circuits.
Mike holts illustrated guide to basic electrical theory. Bens theory became the convention hence the term conventional current in electrical theory, mathematics, textbooks and electrical equipment for the next hundred years. Dc current flows in only one direction at a constant magnitude ac current continually changes in both magnitude and direction ac current flows in one direction, then flows in the opposite direction if ac current is present, there must. It contains a source of electrical energy the dry cells in the flashlight, a load the bulb which changes the. In very basic terms, much theory is equally applicable to both ac and dc circuits, typically, as the voltage increases so does the current proportionally.
Electrical designers use it to determine how much voltage is required for a certain load, like a motor, a computer, or even a house full of appliances. Analyze various dc circuits to find resistances, currents, and voltages at any given point within the circuit. Choose from 500 different sets of basic electrical theory flashcards on quizlet. Best of all, they are entirely free to find, use and download, so there is no cost or stress at all. The voltage produced by the stationary coils by the motion of the rotating magnet is proportional to the rate at which the magnetic flux is changing perpendicular to the coils faradays law of electromagnetic induction. As such, this book employs a novel approach to the exposition of the material in which phasors and ac steadystate analysis are introduced at the beginning. Ac and dc power will be discussed to identify the two types of power and how they are used in the transmission of electricity. He was a journeyman electrician, master electrician, and electrical contractor. Practical implementation of fundamental theory concepts. The electrical science handbook consists of fifteen modules that are contained in four volumes.
Two basic laws that describe the performance of electric circuits are ohms law and kirchhoffs circuit rules. Electrical fundamentals introduction to direct current dc theory. These modules offer handson experiences in residential design and demonstrate the techniques used to install the most common plumbing and electrical fixtures. Understand the electrical principles of direct cur rent dc. Volts, amps, watts, fuse sizing, wire gauge, acdc, solar power and more. The voltage on the left hand 10 ohm resistor is flowing out of the top terminal of the resistor. Dc current flows in only one direction at a constant magnitude. In the uk, and many other countries, this cycle is repeated 50 times a second, known as 50 hertz, 60 hertz also being common. Basic electrical theory assessment exam proprofs quiz. This module describes the basic concepts of direct current dc electrical circuits.
The skills that you will gain from these lessons are invaluable. Time behaviour of electrical quantities affects methods and determines instrumentations convenient for the measurement. For every 20 turns in the primary, there is one turn in the secondary. Students will learn different applications of commonly used electrical machinery. In other words, it is a measurement of the work required to move a unit charge between two points. Electrical engineering fundamentals for nonelectrical engineers is a course designed to promote an understanding of the fundamentals of electricity. Electrical science basic dc theory viii es02 objectives terminal objective 1. Because of this, i was asked to write a short series in an endeavour to improve the readers. Electrical theory alternating current direct current. With our online resources, you can find basic electrical engineering by dc kulshreshtha or just about any type of ebooks, for any type of product. Course syllabus elpt 11 basic electrical theory c a ta l o g d e s c r i p ti o n. Understand the difference between direct current and alternating current. The resulting value can be calculated using the formula.
Brush up on some basic electrical theory and deepen your knowledge about electricity. The reason why an electromechanical alternator outputs sinewave ac is due to the physics of its operation. In 1974, mike realized there was a need for quality electrical training and opened. Ohms law is the basic formula used in all ac and dc electrical circuits. The simplest circumstance is when voltage and current are steady in time. For this issue, every electronics electrical circuit consist three basic individual quantities which is called as v i r. Volume 1 of 4 module 1 basic electrical theory this module describes basic electrical concepts and introduces electrical terminology. Learn the essentials of electrical grounding and bonding. The handbook includes information on alternating current ac and direct current dc theory, circuits, motors, and generators. Complete the record sheet in the back of this booklet and submit it as instructed by county 4. Finding motor hp horse power, kva kilovolt ampere kw input, when motor hp is known kw kilowatts amperes, when kva is known. See all formats and editions hide other formats and editions. This theory states that electrons flow from negative to positive.
In this post we cover ohms law, ac and dc current, circuits and more. A contributor to the model engineers workshop magazine commented that he thought some readers do not fully follow articles on an electrical topic due to a lack of understanding of basic electrical theory. Furthermore, there are other periodic waveforms observed in electrical circuits that can be approximated by timevarying ideal signals. In order to construct a building that will last into the future, a strong foundation is a prerequisite. For every 20 rotations in the secondary, there is one rotation in the primary. Mike holts illustrated guide to basic electrical theory 3rd edition perfect paperback january 1, 2011 by mike holt author 4. We can find the following quantities by using below formulas chart electrical formulas in dc full load current in amperes alternating current ac motors alternating current ac single. The flashlight is an example of a basic electric circuit. Students will learn strong basics of electrical engineering and practical implementation of electrical fundamentals. The most basic of circuits is were a voltage v is feeding a resistor r resulting in a current i, sk3. Such approximation is usually done using exponential, linear, or logarithmic functions. This flow of electrons is called an electrical current.
In this manual, the electron flow convention is used. The course covers the differences between alternating current ac and direct current dc power sources by explaining the behavior of the voltage and current for both types of sources. The two most important areas of study for all electrical and electronic engineering students are those of circuit theory and electromagnetic field theory. Oct 21, 2015 learn basic electrical concepts and terms. All voltages and currents have polarity as well as magnitude. Lessons in electric circuits volume ii ac chapter 1. If a transformer ratio is 201, then which of the following is true. L e c tu r e h o u r s 2, l a b h o u r s 3 p r e r e q u i s i te s. Know the fundamental of electrical engineering and practical. Electrical theory is a basic building block that every potential electrician must understand from the start. Understand the electrical principles of alternating current ac. In 1974, mike realized there was a need for quality electrical training and opened mike holt. Electrical circuits whether you are using a battery, a fuel cell or a solar cell to produce electricity, there are three things that are always the same.
A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The v is for voltage, which means the potential difference between two charges. So if you know two of the three characteristics, your can calculate the third one. Many branches of electrical engineering, such as power, electric machines, control, electronics, communications, and. As such, this book employs a novel approach to the exposition of the material in which phasors and ac steadystate analysis are introduced at. Finding motor hp horse power, kva kilovolt ampere kw input, when motor hp is known kw kilowatts amperes, when kva is. Volts, amps, watts, fuse sizing, wire gauge, ac dc, solar power and more. Basic electrical theory pjm2014 102420 power principles and phase angle. During operation the dryer draws a current of approximately.
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