Tuesday 12 August 2014

Free Online Engineering Text Books



It Contains links to various  Free Online Engineering Text Books, online notes and reference materials  on various engineering topics such as Computer, Electronics, Electrical, Mechanical, Chemical, Instrumentation and many more to be downloaded.

1. http://www.freeengineeringbooks.com/

2. http://ebook3000.com/Engineering-Technology/

3. http://www.faadooengineers.com/forums/112-Engineering-Ebooks-Download-Engineering-Lecture-Notes

4. http://www.engineering.careers360.com/taxonomy/term/5554

5. http://www.free-ebooks.net/category/engineering-textbooks

6. http://www.engineering108.com/

7. http://bookboon.com/en/

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Tuesday 17 June 2014

Q & A: Electronics and Communication Engineering

1) Expand ECE.
Electronics & Communication Engineering.


 2) What is Electronic?
The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles.

 3) What is communication?
Communication means transferring a signal from the transmitter which passes through a medium then the output is obtained at the receiver. (or)communication says as transferring of message from one place to another place called communication.

4) Different types of communications? Explain.
Analog and digital communication.
As a technology, analog is the process of taking an audio or video signal (the human voice) and translating it into electronic pulses. Digital on the other hand is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s.
Digital signals are immune to noise, quality of transmission and reception is good, components used in digital communication can be produced with high precision and power consumption is also very less when compared with analog signals.

5) What is engineering?
The application of science to the needs of humanity and a profession in which a knowledge of the mathematical and natural sciences gained by study, experience, and practice is applied with judgment to develop ways to use economically the materials and forces of nature for the benefit of mankind.

6) Difference between electronic and electrical.
Electronics work on DC and with a voltage range of -48vDC to +48vDC. If the electronic device is plugged into a standard wall outlet, there will be a transformer inside which will convert the AC voltage you are supplying to the required DC voltage needed by the device. Examples: Computer, radio, T.V, etc...
Electric devices use line voltage (120vAC, 240vAC, etc...). Electric devices can also be designed to operate on DC sources, but will be at DC voltages above 48v. Examples: are incandescent lights, heaters, fridge, stove, etc...

 7) What is sampling?
The process of obtaining a set of samples from a continuous function of time x(t) is referred to as sampling.

8) What is a rectifier?
A rectifier changes alternating current into direct current. This process is called rectification. The three main types of rectifier are the half-wave, full-wave, and bridge. A rectifier is the opposite of an inverter, which changes direct current into alternating current.
HWR- The simplest type is the half-wave rectifier, which can be made with just one diode. When the voltage of the alternating current is positive, the diode becomes forward-biased and current flows through it. When the voltage is negative, the diode is reverse-biased and the current stops. The result is a clipped copy of the alternating current waveform with only positive voltage, and an average voltage that is one third of the peak input voltage. This pulsating direct current is adequate for some components, but others require a more steady current. This requires a full-wave rectifier that can convert both parts of the cycle to positive voltage.
FWR- The full-wave rectifier is essentially two half-wave rectifiers, and can be made with two diodes and an earthed centre tap on the transformer. The positive voltage half of the cycle flows through one diode, and the negative half flows through the other. The centre tap allows the circuit to be completed because current cannot flow through the other diode. The result is still a pulsating direct current but with just over half the input peak voltage, and double the frequency.

9) What is resistor?
A resistor is a two-terminal electronic component that opposes anelectric current by producing a voltage drop between its terminals in proportion to the current, that is, in accordance with Ohm's law: V= IR.

10) What is capacitor?
A capacitor is an electrical/electronic device that can store energyin the electric field between a pair of conductors (called "plates"). The process of storing energy in the capacitor is known as "charging", and involves electric charges of equal magnitude, but opposite polarity, building up on each plate.
Capacitors are occasionally referred to as condensers. This term is considered archaic in English, but most other languages use acognate of condenser to refer to a capacitor.

11) What is inductor?
An inductor is a passive electrical device employed in electrical circuits for its property of inductance. An inductor can take many forms.

41) What is conductor?
A substance, body, or device that readily conducts heat, electricity, sound, etc. Copper is a good conductor of electricity.

12) What is a semi conductor?
A semiconductor is a solid material that has electrical conductivityin between that of a conductor and that of an insulator(AnInsulator is a material that resists the flow of electric current. It is an object intended to support or separate electrical conductorswithout passing current through itself); it can vary over that wide range either permanently or dynamically.

13) What is diode?
In electronics, a diode is a two-terminal device. Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional current property.

14) What is transistor?
In electronics, a transistor is a semiconductor device commonly used to amplify or switch electronic signals. The transistor is the fundamental building block of computers, and all other modernelectronic devices. Some transistors are packaged individually but most are found in integrated circuits.

15) What is op-amp?
An operational amplifier, often called an op-amp , is a DC-coupledhigh-gain electronic voltage amplifier with differential inputs[1] and, usually, a single output. Typically the output of the op-amp is controlled either by negative feedback, which largely determines the magnitude of its output voltage gain, or by positive feedback, which facilitates regenerative gain and oscillation.

16) State sampling theorem.
It states that, while taking the samples of a continuous signal, it has to be taken care that the sampling rate is equal to or greater than twice the cut off frequency and the minimum sampling rate is known as the Nyquist rate.

17) What is cut-off frequency?
The frequency at which the response is -3dB with respect to the maximum response.

18) What is pass band?
Passband is the range of frequencies or wavelengths that can pass through a filter without being attenuated.

Saturday 31 May 2014

Operating System Question and Answers:

1. What are the basic functions of an operating system? - Operating system controls and 
coordinates the use of the hardware among the various applications programs for various uses. 
Operating system acts as resource allocator and manager. Since there are many possibly 
conflicting requests for resources the operating system must decide which requests are allocated 
resources to operating the computer system efficiently and fairly. Also operating system is 
control program which controls the user programs to prevent errors and improper use of the 
computer. It is especially concerned with the operation and control of I/O devices. 


2. Why paging is used? - Paging is solution to external fragmentation problem which is to permit 
the logical address space of a process to be noncontiguous, thus allowing a process to be 
allocating physical memory wherever the latter is available. 

3. While running DOS on a PC, which command would be used to duplicate the entire 
diskette? diskcopy 

4. What resources are used when a thread created? How do they differ from those when a 
process is created? - When a thread is created the threads does not require any new resources to 
execute the thread shares the resources like memory of the process to which they belong to. The 
benefit of code sharing is that it allows an application to have several different threads of activity 
all within the same address space. Whereas if a new process creation is very heavyweight 
because it always requires new address space to be created and even if they share the memory 
then the inter process communication is expensive when compared to the communication 
between the threads. 

5. What is virtual memory? - Virtual memory is hardware technique where the system appears to 
have more memory that it actually does. This is done by time-sharing, the physical memory and 
storage parts of the memory one disk when they are not actively being used. 

6. What is Throughput, Turnaround time, waiting time and Response time? – 
1. Throughput : number of processes that complete their execution per time unit. 
2. Turnaround time: amount of time to execute a particular process. 
3. Waiting time; amount of time a process has been waiting in the ready queue. 
4. Response time: amount of time it takes from when a request was submitted until the first 
response is produced, not output (for time-sharing environment). 

7. What is the state of the processor, when a process is waiting for some event to occur? - 
Waiting state 

8. What is Dispatcher? - Dispatcher module gives control of the CPU to the process selected by 
the short-term scheduler; this involves: Switching context, Switching to user mode, Jumping to 
the proper location in the user program to restart that program, dispatch latency ‚ time 
it takes for the dispatcher to stop one process and start another running. 

9. What is CPU Scheduler? - Selects from among the processes in memory that are ready to 
execute, and allocates the CPU to one of them. CPU scheduling decisions may take place when a 
process: 1.Switches from running to waiting state. 2.Switches from running to ready state. 
3.Switches from waiting to ready. 4.Terminates. Scheduling under 1 and 4 is non-preemptive. 
All other scheduling is preemptive. 

10. What is Context Switch? - Switching the CPU to another process requires saving the state of 
the old process and loading the saved state for the new process. This task is known as a context 
switch. Context-switch time is pure overhead, because the system does no useful work while 
switching. Its speed varies from machine to machine, depending on the memory speed, the 
number of registers which must be copied, the existed of special instructions(such as a single 
instruction to load or store all registers). 

11. What is cache memory? - Cache memory is random access memory (RAM) that a computer 
microprocessor can access more quickly than it can access regular RAM. As the microprocessor 
processes data, it looks first in the cache memory and if it finds the data there (from a previous 
reading of data), it does not have to do the more time-consuming reading of data from larger 
memory. 

12. What is a Safe State and what is its use in deadlock avoidance? - When a process requests an 
available resource, system must decide if immediate allocation leaves the system in a safe state. 
System is in safe state if there exists a safe sequence of all processes. Deadlock Avoidance: 
ensure that a system will never enter an unsafe state. 

13. What is a Real-Time System? - A real time process is a process that must respond to the events 
within a certain time period. A real time operating system is an operating system that can run real 
time processes successfully 

14. What is hard disk and what is its purpose? - Hard disk is the secondary storage device, which 
holds the data in bulk, and it holds the data on the magnetic medium of the disk.Hard disks have 
a hard platter that holds the magnetic medium, the magnetic medium can be easily erased and 
rewritten, and a typical desktop machine will have a hard disk with a capacity of between 10 and 
40 gigabytes. Data is stored onto the disk in the form of files. 

15. What is fragmentation? Different types of fragmentation? - Fragmentation occurs in a 
dynamic memory allocation system when many of the free blocks are too small to satisfy any 
request. External Fragmentation: External Fragmentation happens when a dynamic memory 
allocation algorithm allocates some memory and a small piece is left over that cannot be 
effectively used. If too much external fragmentation occurs, the amount of usable memory is 
drastically reduced. Total memory space exists to satisfy a request, but it is not 
contiguous. Internal Fragmentation: Internal fragmentation is the space wasted inside of 
allocated memory blocks because of restriction on the allowed sizes of allocated blocks. 
Allocated memory may be slightly larger than requested memory; this size difference is memory 
internal to a partition, but not being used

Saturday 10 May 2014

Top 50 Engineering Inventions of the Past 5 Decades:


1955—TV REMOTE CONTROL
It marks the official end of humanity's struggle for survival and the beginning of its quest for a really relaxing afternoon. The first wireless remote, designed by Zenith's Eugene Polley, is essentially a flashlight. When Zenith discovers that direct sunlight also can change channels on the remote-receptive TVs, the company comes out with a model that uses ultrasound; it lasts into the 1980s, to the chagrin of many a family dog. The industry then switches to infrared.

1955—MICROWAVE OVEN
In 1945 Raytheon's Percy Spencer stands in front of a magnetron (the power tube of radar) and feels a candy bar start to melt in his pocket: He is intrigued. When he places popcorn kernels in front of the magnetron, the kernels explode all over the lab. Ten years later Spencer patents a "radar range" that cooks with high-frequency radio waves; that same year, the Tappan Stove Co. introduces the first home microwave model.

1957—BIRTH-CONTROL PILL
Enovid, a drug the FDA approves for menstrual disorders, comes with a warning: The mixture of synthetic progesterone and estrogen also prevents ovulation. Two years later, more than half a million American women are taking Enovid—and not all of them have cramps. In 1960 the FDA approves Enovid for use as the first oral contraceptive.

1958—JET AIRLINER 
The Boeing 707-120 debuts as the world's first successful commercial jet airliner, ushering in the era of accessible mass air travel. The four-engine plane carries 181 passengers and cruises at 600 mph for up to 5280 miles on a full tank. The first commercial jet flight takes off from New York and lands in Paris; domestic service soon connects New York and Los Angeles.

1959—FLOAT GLASS
There's a reason old windowpanes distort everything: They were made by rapidly squeezing a sheet of red-hot glass between two hot rollers, which produced a cheap but uneven pane. British engineer Alastair Pilkington revolutionizes the process by floating molten glass on a bath of molten tin—by nature, completely flat. The first factory to produce usable float glass opens in 1959; an estimated 90 percent of plate glass is still produced this way.


1961—CORDLESS TOOLS
Black and Decker releases its first cordless drill, but designers can't coax more than 20 watts from its NiCd batteries. Instead, they strive for efficiency, modifying gear ratios and using better materials. The revolutionary result puts new power in the hands of DIYers and—thanks to a NASA contract—the gloves of astronauts.

1961—INDUSTRIAL ROBOT
The Unimate, the first programmable industrial robot, is installed on a General Motors assembly line in New Jersey. Conceived by George C. Devol Jr. to move and fetch things, the invention gets a lukewarm reception in the United States. Japanese manufacturers love it and, after licensing the design in 1968, go on to dominate the global market for industrial robots.

1962—COMMUNICATIONS SATELLITE 
Telstar is launched as the first "active" communications satellite—active as in amplifying and retransmitting incoming signals, rather than passively bouncing them back to Earth. Telstar makes real a 1945 concept by science fiction author Arthur C. Clarke, who envisioned a global communications network based on geosynchronous satellites. Two weeks after Telstar's debut, President Kennedy holds a press conference in Washington, D.C., that is broadcast live across the Atlantic.

1962—LED 
Working as a consultant for General Electric, Nick Holonyak develops the light-emitting diode (LED), which provides a simple and inexpensive way for computers to convey information. From their humble beginnings in portable calculators, LEDs spread from the red light that indicates coffee is brewing to the 290-ft.-tall Reuters billboard in Times Square.

1964—UNMANNED AERIAL VEHICLES
Widespread use of remotely piloted aircraft begins during the Vietnam War with deployment of 1000 AQM-34 Ryan Firebees. The first model of these 29-ft.-long planes was developed in just 90 days in 1962. AQM-34s go on to fly more than 34,000 surveillance missions. Their success leads to the eventual development of the Unmanned Aerial Vehicles widely used today.

1962/VIDEO GAMES MIT programmers write Spacewar; 43 years later 89 percent of school-age kids own video games. 1955/POLIO VACCINE The year Jonas Salk finds a way to prevent polio, there are 28,985 global cases; by 2005, the number drops to 1200. 1957/THREE-POINT SEATBELT According to the U.S. Department of Transportation, more than 15,000 American lives are saved in 2005 by Nils Bohlin's device.

The first general-purpose computer, the nearly 30-ton ENIAC (1947), contains 18,000 vacuum tubes, 70,000 resistors and 10,000 capacitors. In 1959, the INTEGRATED CIRCUIT puts those innards on one tiny chip. Before the entire world is networked, there is the ARPANET—four computers linked in 1969. It introduces the concept of "packet switching," which simultaneously delivers messages as short units and reassembles them at their destination. The Apple II, Commodore Pet and Radio Shack's TRS-80 are introduced in 1977—four years before IBM, soon to become synonymous with the term "PC," unveils its PERSONAL COMPUTER. In 1989, Sir Tim Berners-Lee creates "hypertext markup language" (HTML) to make Web pages and the "Uniform Resource Locator" (URL) to identify where information is stored. These breakthroughs form the foundation of the WORLD WIDE WEB. 

1964—MUSIC SYNTHESIZER 
Robert Moog develops the first electronic synthesizer to make the leap from machine to musical instrument. Moog's device not only generates better sounds than other synthesizers, it can be controlled by a keyboard rather than by punch cards. The subsequent acceptance of electronic music is a crucial step in developing audio technology for computers, cellphones and stereos.

1966—HIGH-YIELD RICE 
The International Rice Research Institute in the Philippines releases a semi-dwarf, high-yield Indica variety that, in conjunction with high-yield wheat, ushers in the Green Revolution. Indica rice thrives in tropical regions of Asia and South America, raising worldwide production more than 20 percent by 1970.

1969—SMOKE DETECTOR 
Randolph Smith and Kenneth House patent a battery-powered smoke detector for home use. Later models rely on perhaps the cheapest nuclear technology you can own: a chunk of americium-241. The element's radioactive particles generate a small electric current. If smoke enters the chamber it disrupts the current, triggering an alarm.

1969—CHARGE-COUPLED DEVICE 
Bell Labs' George Smith and Willard Boyle invent a charge-coupled device (CCD) that can measure light arriving at a rate of just one photon per minute. Smith and Boyle's apparatus allows extremely faint images to be recorded, which is very useful in astronomy. Today, its most noticeable impact is in digital cameras, which rely on CCD arrays containing millions of pixels.

1970—DIGITAL MUSIC 
James Russell, a scientist with the Pacific Northwest National Laboratory, invents the first digital-to-optical recording and playback system, in which sounds are represented by a string of 0s and 1s and a laser reads the binary patterns etched on a photosensitive platter. Russell isn't able to convince the music industry to adopt his invention, but 20 years later, Time Warner and other CD manufacturers pay a $30 million patent infringement settlement to Russell's former employer, the Optical Recording Co.

1971—WAFFLE-SOLE RUNNING SHOES 
Bill Bowerman, the track coach at the University of Oregon, sacrifices breakfast for peak performance when he pours rubber into his wife's waffle iron, forming lightweight soles for his athletes' running shoes. Three years later, Bowerman's company, Nike, introduces the Waffle Trainer, which is an instant hit.

IN THEIR WORDS
1962 Computer Mouse
"I don't know why we call it a mouse. It started that way, and we never changed it." —Doug Engelbart, engineer, Stanford Research Institute, 1968

1969 Automated Teller Machine
"On Sept. 2, our bank will open at 9:00 and never close again!" —Long Island branch of Chemical Bank, advertisement from 1969

1973 Cellphone
"Joel, I'm calling you from a real cellular phone." —Martin Cooper, leader of Motorola's cellphone team, to Joel Engel, research head of rival AT&T's Bell Labs, April 3, 1973

1978 In-Vitro Fertilization
"We'd love to have children of our own one day. That would be such a dream come true." —Louise Brown Mullinder, the first test-tube baby, on her wedding day, in 2003

1979 Sony Walkman
"This is the product that will satisfy those young people who want to listen to music all day." —Akio Morita, Sony Chairman, February 1979

RADICAL FIBERS

From easy-on shoes to lighter tennis rackets and stronger planes, revolutionary materials have changed our lives.

In 1955, Patent No. 2,717,437 is issued to George de Mestral for VELCRO, a fabric inspired by burrs that stick to his dog's fur. In 1961 researchers in Japan develop high-quality CARBON-FIBER COMPOSITES, capping a decade of experimentation with plastics reinforced by carbon fibers. Thanks to DuPont's Stephanie Kwolek and Herbert Blades, who in 1965 invent a high-strength polymer called KEVLAR, the body armor of 2920 police and correctional officers has protected them from fatal attacks. The term "FIBEROPTIC" is coined in 1956, but it isn't until 1970 that scientists at Corning produce a fiber of ultrapure glass that transmits light well enough to be used for telecommunications. 

1972—ELECTRONIC IGNITION 
Chrysler paves the way for the era of electronic—rather than mechanical—advances in automobiles with the electronic ignition. It leads to electronic control of ignition timing and fuel metering, harbingers of more sophisticated systems to come. Today, these include electronic control transmission shift points, antilock brakes, traction control systems, steering and airbag deployment.

1973—MRI
Everyone agrees that magnetic resonance imaging (MRI) is a brilliant invention—but no one agrees on who invented it. The physical effect that MRIs rely on—nuclear magnetic resonance—earns various scientists Nobel Prizes for physics in 1944 and 1952. Many believe that Raymond Damadian establishes the machine's medical merit in 1973, when he first uses magnetic resonance to discern healthy tissue from cancer. Yet, in 2003, the Nobel Prize for medicine goes to Peter Lauterbur and Peter Mansfield for their "seminal discoveries." The topic of who is the worthiest candidate remains hotly debated.

1978—GPS 
The first satellite in the modern Navstar Global Positioning System (GPS) is launched. (The GPS's precursor, TRANSIT, was developed in the early 1960s to guide nuclear subs.) It is not until the year 2000, though, that President Clinton grants nonmilitary users access to an unscrambled GPS signal. Now, cheap, handheld GPS units can determine a person's location to within 3 yards.

1981—SCANNING TUNNELING MICROSCOPE 
By moving the needle of the scanning tunneling microscope (STM) across a surface and monitoring the electric current that flows through it, scientists can map a surface to the level of single atoms. The STM is so precise that it not only looks at atoms—it also can manipulate them into structures. The microscope's development earns IBM researchers Gerd Binnig and Heinrich Rohrer a Nobel Prize and helps launch the emerging era of nanotechnology.

1984—DNA FINGERPRINTING 
Molecular biologist Alec Jeffreys devises a way to make the analysis of more than 3 billion units in the human DNA sequence much more manageable by comparing only the parts of the sequence that show the greatest variation among people. His method quickly finds its way into the courts, where it is used to exonerate people wrongly accused of crimes and to finger the true culprits.

USES
1958/LASER BEAM Whitens teeth, removes tattoos, corrects vision, scans groceries, tracks missiles. 1978/GENETIC ENGINEERING Produces insulin, creates vaccines, clones sheep, increases shelf life of tomatoes, manipulates human cells to prevent disease. 1958/SUPER GLUE Repairs a broken taillight, reassembles a vase, strengthens knots on a hammock, closes wounds, lifts fingerprints.

LIFESAVERS

Over the past 50 years, a few pivotal medical discoveries have helped to boost adult life expectancy dramatically.

In 1956, Wilson Greatbatch grabs the wrong resistor and connects it to a device he is building to record heartbeats. When the circuit emits a pulse, he realizes the device can be used to control the beat; in 1960 the first PACEMAKER is successfully implanted in a human. Rene Favaloro performs the first CORONARY BYPASS SURGERY in 1967, taking a length of vein from a leg and grafting it onto the coronary artery. This allows blood to flow around the blocked section. Thanks in part to these advances, the number of deaths from heart disease declines in the U.S. by almost 50 percent. The outlook for people infected by HIV also dramatically changes. The FDA approves Invirase, the first of a class of drugs called HIV PROTEASE INHIBITORS, in 1995. By blocking the function of enzymes used in the virus's replication, the inhibitors can reduce HIV to undetectable levels for sustained periods in up to 90 percent of patients.

1985—POLYMERASE CHAIN REACTION 
Biochemist Kary Mullis invents a technique that exploits enzymes in order to make millions of copies of a tiny scrap of DNA quickly and cheaply. No matter how small or dried-out a bloodstain is, forensic scientists can now gather enough genetic material to do DNA fingerprinting. With PCR, doctors also can search for trace amounts of HIV genetic code to diagnose infection much sooner than by conventional methods.

1987—PROZAC 
Prozac becomes the first in a new class of FDA-approved antidepressants called "selective serotonin re-uptake inhibitors," which block the reabsorption of the mood-elevating neurotransmitter serotonin, thereby prolonging its effects. Though at times controversial, Prozac helps patients cope with clinical depression, reshaping our understanding of how personality and emotion can be chemically controlled. Within five years, 4.5 million Americans are taking Prozac—making it the most widely accepted psychiatric drug ever.

1998—GENETIC SEQUENCING 
Scientist Craig Venter announces that his company will sequence the entire human genome in just three years and for only $300 million—12 years and $2 billion less than a federally funded project established to do the same thing. Venter uses a method called "shotgun sequencing" to make automated gene sequencers, instead of relying on the laborious approach used by the government program. The result is an acrimonious race to the finish, which ends in a tie. Both groups announce the completion of the human genome sequence in papers published in 2001.

1998—MP3 PLAYER
Depending on who you ask, the MP3 is either the end of civilization (record companies) or the dawn of a new world (everyone else). The Korean company Saehan introduces its MPMan in 1998, long before Apple asks, "Which iPod are you?" When the Diamond Rio hits the shelves a few months later, the Recording Industry Association of America sues—providing massive publicity and a boost to digital technology.

2002—IEEE 802.16
The geniuses at the Institute of Electrical and Electronics Engineers publish a wireless metropolitan area network standard that functions like Wi-Fi on steroids. An 802.16 antenna can transmit Internet access up to a 30-mile radius at speeds comparable to DSL and cable broadband. When it all shakes out, 802.16 could end up launching developing nations into the digital age by eliminating the need for wired telecommunications infrastructure.

Monday 10 February 2014

How Does a Transformer Work?

A transformer is an electrical device that takes electricity of one voltage and changes it into another voltage. You'll see transformers at the top of utility poles and even changing the voltage in a toy train set. 


Basically, a transformer changes electricity from high to low voltage using two properties of electricity. In an electric circuit, there is magnetism around it. Second, whenever a magnetic field changes (by moving or by changing strength) a voltage is made. Voltage is the measure of the strength or amount of electrons flowing through a wire.If there's another wire close to an electric current that is changing strength, the current of electricity will also flow into that other wire as the magnetism changes. 

A transformer takes in electricity at a higher voltage and lets it run through lots of coils wound around an iron core. Because the current is alternating, the magnetism in the core is also alternating. Also around the core is an output wire with fewer coils. The magnetism changing back and forth makes a current in the wire. Having fewer coils means less voltage. So the voltage is "stepped-down." 
Transformers on the Electrical Grid:

Let's look at the electricity that comes to your home. When electricity moves from a power plant it is put into a very high voltage to be able to travel long distances. The high voltage lines can be as high 155,000 to 765,000 volts to travel many hundreds of miles. 

In order for your home or a store to use the electricity, it has to be at a lower voltage than on the long-distance lines. So, the electricity is "stepped-down to a lower level using a transformer. This lower voltage electricity is put into the local electric wires at a substation. The substation breaks the larger amount of power down into smaller pieces at lower voltage. It then is stepped down again and again.

Once smaller transformers take that voltage down to usually 7,200, the power leaves this substation.In your neighborhood, a transformer on top of a utility pole, or one connected to underground wires, transforms the 7,200 volts into 220-240 volts. This is then sent into your home over three wires. The three wires go through the electric meter, which measures how much electricity you use. One of the three wires is the ground, and the other two are the positives.Some of the electrical appliances in your home use the 220-240 volts. These are things like a water heater, stove and oven, or air conditioner. They have very special connections and plugs. Other devices, like your TV or computer only use one-half of the electricity -- 110-120 volts.In a toy train set, the voltage is reduced even more from 110-120 and is changed from alternating current into direct current.

Saturday 18 January 2014

List of Chemical companies in Chennai

Click on the company to go to their website/website link and apply @ careers:





















































































































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