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Electrical Engineering Articles
Page 10 of 12
What is Flash Welding? – Parts, Process, Advantages, Disadvantages and Applications
Flash WeldingFlash welding, also called flash butt welding, is a resistance welding process, in which the ends of the workpieces are pressed together and a heavy electric current is passed through the joint during the welding process.In flash welding, the electrical current is applied to the workpieces before they are brought together so that when they meet arcing (or flashing) takes place.Parts of Flash WeldingThe main parts of the flash welding process are described below −Power Supply – An AC power supply is used to provide power for the flash welding or flash butt welding.Welding Transformer – A welding transformer ...
Read MoreWhat is Electrolysis? – Definition, Principle, and Process
What is Electrolysis?The process of electrolysis can be defined in many ways −A technique that uses a direct electric current to stimulate a non-spontaneous chemical reaction is known as electrolysis.In other words, the process in which ionic substances are decomposed into simple substances by passing an electric current through them is known as electrolysis.Or, electrolysis is the process based on the fact that electrical energy can produce chemical changes, i.e., it can cause a chemical reaction to happen.Principle of ElectrolysisThe principle of electrolysis is based on the term "Electrolyte". An electrolyte is a substance containing free ions that make the ...
Read MoreCommon Faults and Treatment Methods of Fluorescent Lamp
A low-pressure mercury vapor gas discharge lamp that uses fluorescence effect to produce visible light is known as fluorescent lamp or fluorescent tube.There are some common faults in case of the fluorescent lamps. These faults, their reasons and treatment methods are described in the following table −Type of FaultReasons of FaultTreatment or Repairing MethodsThe fluorescent lamp does not start.Loose and defective holders.Defective fluorescent tube.Defective starter switch.Defective choke.Turn the tube through 90° and check the connections and holders.Replace the tube.Try another starter switch / replace the starter switch.Replace the choke.Fluorescent lamp blinking ON and OFFLoose contacts.Wrong circuit connections.Low supply voltageDefective starter.Defective ...
Read MoreWhat is Anodizing? – Requirements, Process, Advantages & Applications
The process of deposition of an oxide film on a metal surface is known as anodizing. The anodizing is an electrolytic passivation process, mainly used to increase the thickness of the natural oxide layer on the surface of the metal.This process is called anodizing because the metal part to be treated forms the anode electrode of the electric circuit of the process. The anodizing increases the corrosion resistance and wear resistance and provides better adhesion for paint primers and glues as compared to the bare metal.Requirements of AnodizingThe anodizing of metals is used for the following requirements −To provide the ...
Read MoreWhat is an Incandescent Lamp? – Construction, Working and Applications
An electric light bulb or lamp that produces light by heating a filament wire to a high temperature until it glows is known as incandescent bulb. The incandescent bulb was invented by an American inventor, named Thomas Alva Edison.The incandescent bulb is an electric lamp that works on the principle of incandescence that means it emits light by the heating of a filament. The incandescent lamps come in different sizes with different voltages and wattages.Construction of Incandescent LampThe construction and the parts of an incandescent lamp is shown in the figure below.The most important part of the incandescent lamp is ...
Read MoreTypes of Electric Water Heater (Plate Heater, Immersion Water Heater, Geyser)
An electric heating appliance that is used to heat up water is known as electric water heater. The electric water heater brings cold water in through the dip tube and heats this water using the heat produced by an electric heating element and the heated water taken out through outlet pipes.Electric water heaters are classified into three types viz. −Normal Plate HeaterImmersion HeaterGeyser Water HeaterLet's check each of these types of water heaters in detail.Normal Plate HeaterThe normal plate water heater is the simplest types of water heater. It consists of two round shaped plates made up of nickel. These ...
Read MoreWhat is Sodium Vapor Lamp? – Diagram, Working & Applications
A sodium vapor lamp is type of gas-discharge lamp that uses sodium (Na) in an exciting condition to produce light of thick blue color. The first sodium vapor lamp was commercially designed by Philips in 1932 in Holland.Circuit Diagram of Sodium Vapor LampThe circuit diagram and the construction of a sodium vapor lamp is shown in the figure below.As the sodium vapor lamp is a lamp of low luminosity, its length is large. To get the desired length, the sodium vapor lamp is made in the form of a U-tube. It has two oxide-coated electrodes which are sealed with the ...
Read MoreWhat is a High Pressure Mercury Vapor Lamp? – Construction, Working and Applications
A gas discharge lamp that uses an electric arc through the vaporized mercury to produce light is known as mercury vapor lamp. The operation of the mercury vapor lamp is based on the excitation of atom of some gaseous medium. Also, the frequency and the wavelength of the radiation given out by different atoms of the gaseous medium depend upon the level of their excitation.Construction of Mercury Vapor LampThe construction and circuit for a mercury vapor lamp is shown in the figure below.It consists of an inner tube containing mercury vapor and it is made of hard glass.It also has ...
Read MoreWhat is a Halogen Lamp? – Working Principle, Construction and Applications
A halogen lamp or tungsten halogen lamp is an incandescent lamp. The halogen lamp consists of a tungsten filament enclosed in an environment of an inert gas like argon and a small amount of a halogen like bromine or iodine. The combination of the tungsten filament and the halogen results in a chemical reaction (called regenerative cycle or halogen cycle).This regenerative cycle increases the life span of the filament. Also, the halogen cycle prevents the darkening of the lamp envelope by redepositing the tungsten from the inside of the lamp back onto the filament.Working Principle of Halogen LampThe working of ...
Read MoreWhat is a Fluorescent Lamp? – Construction, Working and Applications
A fluorescent lamp, also called fluorescent tube, is a low pressure mercury vapor gas-discharge lamp that works on the principle of fluorescence to emit visible light.When an electric current is passed through the fluorescent tube, it excites the mercury vapor which produces UV rays that then causes a phosphor coating on the inside of the lamp to glow.Construction of Fluorescent LampThe basic construction of a fluorescent tube lamp is shown in Figure-1.The fluorescent lamp is a low pressure mercury vapor lamp. Thus, due to low pressure, the lamp is made in the form of a long tube whose inside walls ...
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