Found 158 Articles for Electrical Engineering

Electric Discharge LampsA lighting device consisting of a transparent container within which a gas is energized by applying an electric voltage and thereby made to glow is known as electric discharge lamp. The electric discharge lamp is also known as vapor lamp or gas-discharge lamp.Actually, the electric discharge lamp is family of artificial light sources that generates light by sending an electric discharge through an ionized gas. In all types of electric discharge lamps, an electric current is passed through a gas or vapor which renders it luminous. The most commonly used elements in these types of lamps are neon, ... Read More

LED BulbLED stands for Light Emitting Diode. The LED bulb has a P-N junction diode which produces light when an electric current passes through it. In LED bulb, when forward bias is applied to the PN junction, the recombination of charge carriers takes place. The result of this recombination of charge carriers is the emission of light and heat.CFL BulbCFL stands for Compact Fluorescent Lamp. The CFL lamps emits light by the ionization of mercury vapors. In CFL, the ionized low pressure mercury vapors produce UV rays, these UV rays collide with the phosphor coating and hence visible light is ... Read More

Incandescent BulbIncandescent bulb is a type of filament lamp which produces light by heating a filament made up of metals. The incandescent bulb operates on the principle of incandescence, which is the emission of light by heating metal filament.Incandescent lamps were the first type of electric illumination and invented by Thomas Alva Edison, an American inventor.An incandescent lamp is generally made out of a glass shell that houses a tungsten filament. An electric current flowing through the filament, heating it up to the temperature enough to produce light.Fluorescent LampA fluorescent lamp is a type of gas-discharge lamp which uses electric ... Read More

In this article, we will compare and contrast the various features of different types of light sources such as incandescent lamps, fluorescent lamps, sodium vapor lamps and mercury vapor lamps.Starting and StoppingIncandescent lamps have instantaneous start and they become momentarily off when the power supply cuts off.Fluorescent lamps have a reaction time of one second or a little more at the start. These lamps go off and restart when the power supply is restored.Sodium vapor lamps have a starting time of 5 to 8 minutes. These lamps turn off, when the supply goes off and cannot be restarted after the ... Read More

Arc WeldingA welding process in which an electric arc is used to produce heat to melt and join the metals is known as arc welding. In the arc welding, an AC or DC welding power supply is used to create the electric arc between a consumable or non-consumable electrode and the base material.Laser WeldingThe welding process in which a laser beam is used as the source of energy to melt the materials being joined is known as laser welding. It is a high energy density beam process, and can be used to join thick materials with deep and narrow weld.Hybrid ... Read More

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 More

What is Electrolysis?The process in which ionic substances are decomposed into simple substances by passing an electric current through them is known as electrolysis.In other words, the process based on the fact that electrical energy can produce chemical changes is known as electrolysis.Applications of ElectrolysisNowadays the electrolytic process is widely used in various industrial applications. The major applications of the electrolysis are given below.Extraction of Metal from their OresThe electrolytic process is used for extracting out the pure metal from their ores, this process is known as electro-extraction. In the electro-extraction, the metal ore is treated with strong acid or ... Read More

Light is the natural agent that simulates sight and makes the things visible. Light is also known as visible electromagnetic radiation as it is capable of causing a visual sensation and its wavelength varies from 380 nanometers to 780 nanometers.Characteristics of LightThe main characteristics of light are given as follows −Light is nothing but a form of energy produced by a luminous object.It is an electromagnetic radiation, thus it can travel through vacuum.In an optically homogeneous medium, light travels in a straight line.When light falls on a polished surface such as mirror or metal surface, it bounces back. This bouncing ... Read More