PDF Drive is your search engine for PDF files. As of today we have 78,, . PRACTICAL WORK BOOK Basic Electrical & Electronics Engineering BE A Textbook of Electrical Technology Volume I – Basic Electrical Engineering . Books in the IEEE Press Series on Power Engineering. Principles of Electric. Basic Troubleshooting. aracer.mobi - Description of how resistors are manufactured and occupation that uses electrical components or devices.
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Chapter I: deals with the steady state analysis of a. Chapter II: describes various network theorems, star-delta transformation and methods of mesh and nodal analysis for de networks. Balanced and unbalanced, three phase circuits have been analysed and methods of 3-phase power measurements have been discussed in Chapter III: Measuring instruments like, ammeter, voltmeter, wattmeter and energy meter have been described in Chapter IV: Transformer is a very important electrical equipment.
The construction, principle of operation, parameter calculations, efficiency and regulation of transformer have been discussed in chapter V.
Chapter VI: deals in types of de machines, their operation and characteristics, efficiency and speed control and application of these machines. Chapter VII: deals into the construction, principle of operation and applications of three phase synchronous motors and stepper motor.
These motors have been discussed in Chapter VIII: including types, construction, principle of operation, methods of starting, torque-slip characteristic, application and single phasing operation. Single phase induction motors find wide application in Office and domestic appliances.
Construction, principle of operation and application of these motors have been described in Chapter IX: Power systems is the most capital intensive and the most complex system ever developed by man. Chapter X gives in brief, various supply and distribution systems and suggests methods for improvement of power factor. A large number of problems have been solved to help understand the theory. At the end of each chapter unsolved problems with their answers have been suggested for further practice.
At the end, a large number of objective type questions have been added to help the reader to test himself.
Any constructive suggestion for the improvement of the book will be gratefully acknowledged. Last but not the least, I with to express my gratitude to my wife Usha, daughter Meenu and son Sandeep for their patience and encouragement during the preparation of the book.
With AC it is possible to produce the high voltages needed for long transmissions. Therefore today, most portable devices use DC power while power plants produce AC. The V is for voltage, which means the potential difference between two charges.
In other words, it is a measurement of the work required to move a unit charge between two points. When we see a value such as 10 Volts, it is a measurement of the potential difference between two reference points.
As mentioned previously, current is the measurement of the flow of charge in a circuit. This leaves us with the letter R which represents Resistance. Electrical resistance, measured in Ohms, is the measure of the amount of current repulsion in a circuit. Simply, resistance resists current flow. When electrons flow against the opposition offered by resistance in the circuit, friction occurs and heat is produced.
The most common application for resistance in a circuit is the light bulb. The light bulb introduces enough resistance in a circuit to heat up the filament inside, causing light to be emitted. Resistance in a circuit can also be helpful when needing to alter voltage levels, current paths, etc. Resistors are self-contained packages of resistance that can be added to a circuit and are commonly used to divide voltage levels.
First, we need to understand what Series and Parallel circuits mean. Series circuits are those which are connected in-line with the power source. The current in series circuits is constant throughout but the voltage may vary. Parallel circuits are those which branch off from the power supply. The total current supplied from the power source is divided among each of the branches but voltage is common throughout.
You have probably experienced the pain involved with installing Christmas lights only to realize none of them work.
Cue Clark Griswold! There is probably one bulb out somewhere in the hundreds that you hung up. More than likely it is because one of the lights decided to break or burn out and because they are wired in series the rest are now out as well.
Since all of the lights are in-line with each other, if one goes out it causes an open circuit at that point. No current will flow to the other lights because of the open circuit path. Fortunately, a lot of the new light strands are wired in parallel. Therefore if one light goes out, then only that branch of the circuit will be out.
The open will be isolated to that branch and current will continue to the other lights in the strand, Joy…to… the…World! R1 represents the resistance value of the speaker and R2 shows the resistance value of the LEDs. What is the voltage supplied to the LEDs and to the speaker? First, we need to find the current in the loop once the belly is pressed and switch 1 S1 closes.
The supply offers 5 amps of current but the circuit will only use what is demanded by the loads.
This circuit is known as a voltage divider circuit. The supply voltage was divided among the loads in proportion to the resistance each load carries. This law states that the algebraic sum of the voltages in a closed loop is always equal to zero. If we only knew the supply potential and the voltage drop of R1, we could use KVL to find the other voltage drop.
With KVL you have to follow the current path and use the polarities of the components shown.