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Doctors wear White coats because they signify health and hygiene. White is desirable because they show the stains and perhaps indicates when you need to change clothes as soon as they are stained. Frequent changing gives a better outcome for the patient. This will ensure that Doctors maintain a clean and sterile environment all the time.Wearing black robes by Lawyers and Judges dates back to 17th Century British practice. The black color is perceived as a symbol of dignity, honor, wisdom, and justice. As Lawyers and Judges have to keep up these values and maintain grace and dignity black is prescribed ... Read More
After you’ve learned the basics of computer science, you’ll be ready to learn a programming language. Java is a high-level object-oriented programming language which is platform independent and can be run on any mobile, web or desktop applications.Theoretically, it is true that with hard work, effort and right direction one can become an expert in Java programming. But practically it would help if you know one or two core programming languages to understand the jargon easily. Learning the basics of computer science will not be enough. If you have prior knowledge of C language and the concepts, learning Java becomes easier.Java ... Read More
If I ask you what are the basic necessities of life, you would answer food, clothing shelter with internet and a smartphone of course. No, we are not discussing about internet but a reason why we desperately want internet, yes that’s right, for WhatsApp. WhatsApp is a must have app these days for every smartphone owner.WhatsApp is the most popular and widely used messaging app. It is impossible to talk about WhatsApp and not include the privacy and security part in it. We use lots of measures to maintain our privacy, like pattern lock, password protection, archive the chats etc. ... Read More
An electrical device which converts light energy into electrical energy through the photovoltaic effect is known as photovoltaic cell or PV cell or solar cell. A photovoltaic cell is basically a specially designed p-n junction diode.Construction and Working of Photovoltaic CellThe construction of a photovoltaic cell is shown in the following figure.A photovoltaic cell consists of a base metal plate and it is made of either steel or aluminum over which a metallic selenium layer is situated which is light sensitive and acts as the positive terminal.An electrically conducting layer of cadmium oxide is applied by sputtering over the selenium ... Read More
LED LampAn optoelectronic device which emits light based on the principle of electroluminescence is known as LED (Light Emitting Diode) lamp.Electroluminescence is the emission of light due to the interaction of an electric field with a suitable solid. It was noticed in 1962 that a forward biased gallium-arsenide junction was found to be an efficient emitter of radiation.In case of electroluminescent p-n junctions, when biased in the forward direction, some of the energy dissipated is converted into light and hence, these are also called as semi-conductor lamps.Construction of LED LampFor the construction of LED lamps, following semiconductor materials are used ... Read More
An electrochemical process that removes material from a metallic workpiece is known as electropolishing. It is also known as electrochemical polishing or electrolytic polishing.Electro-polishing uses a combination of rectified current and a blended chemical electrolyte bath to remove flaws from the surface of a metal part. Electropolishing is often described as the reverse of electro-plating.Process of ElectropolishingThe schematic arrangement for the electropolishing is shown in the figure.In electro-polishing, the metallic workpiece is immersed in a temperature controlled bath of electrolyte and serves as the anode as it is connected to the positive terminal of a DC power supply.The negative terminal ... Read More
What is Electrodeposition?An electrolytic process by which one metal is deposited over other metal or non-metal is known as electrodeposition.Electrodeposition is widely used for decorative, protective and functional purposes. The process of electrodeposition includes −Electroplating − It is the process of deposition of metal over any metallic or non-metallic surfaces for protecting the metals from corrosion.Electro metallization − It is a process by which a metal can be deposited on a conducting base for decorative or protective purposes.Electro typing − It is a process used to reproduce printing, set up typing and medals, etc.Electro forming − It is a process ... Read More
Electric TractionThe action of pulling something over a surface (especially a road or a track) is known as traction. The action of drawing of vehicles by electric power derived from overhead wires, third rail, storage batteries or diesel generators mounted on the vehicles is known as electric traction. In simple words, the traction system which uses electric power for its operation is known as electric traction.The electric traction system is widely used in electric trains, tramcars, trolley buses and hybrid vehicles, etc.Advantages of Electric TractionThe major advantages of electric traction system over other types of traction (such as steam traction) ... Read More
The combination of an electric motor, energy transmitting shaft and control devices for motion control is known as electric drive. The following figure shows the block diagram of a typical electric drive.Based on their assembly, electric drives can be of the following three types −Individual DriveGroup DriveMulti-motor driveIn this article, let's check the advantages and disadvantages of using an Individual Electric Drive.What is an Individual Electric Drive?When an individual machine is fitted with its own electric motor, then the electric drive is known as individual electric drive. In case of individual electric drive, each operator has complete control on his ... Read More
What is an Electric Drive?The combination of an electric motor, energy transmitting shaft and control device for motion control is known as electric drive. The following figure shows the block diagram of a typical electric drive.Based on their assembly, electric drives can be of the following three types −Individual DriveGroup DriveMulti-motor driveIn this article, let's check where exactly the electric drives are used and what are benefits and drawbacks of using electric drives.Advantages of Electric DriveThe advantages of using electric drives are listed below −Electric drives are environment friendly as they do not produce smoke, fumes, ash, etc. Therefore, electric ... Read More