Found 42 Articles for Electric Power System

The combination of an electric motor, energy transmitting shaft and control devices for motion control is known as an 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 a multi-motor drive.Multi-motor DriveA mechanism in which separate motors are used for operating different parts of the same machine is known as a multi-motor electric drive.The block diagram of a multi motor drive is shown in the figure below.Advantages of Multimotor ... Read More

LASER stands for Light Amplification by Stimulated Emission of Radiation. A LASER is a source of light which produces a very narrow beam of light that is useful in many technologies and instruments.Construction and Working of LASERThe construction of a typical red LASER is shown in the figure.It contains a long crystal of made ruby with a flash tube (which is not shown for simplicity, instead directly pump light is shown) wrapped around it.Here, a high voltage electric power supply makes the tube flash on and off. When the tube flashes, it pumps energy into the ruby crystal. The flashes ... Read More

The irregularities formed in the given weld metal due to wrong welding process or incorrect welding patterns, etc. are known as welding defects.The following table elaborates the different types of welding defects, their causes, and how to prevent these defects −The irregularities formed in the given weld metal due to wrong welding process or incorrect welding patterns, etc. are known as welding defects.The following table elaborates the different types of welding defects, their causes, and how to prevent these defects −Welding DefectCauses of Welding DefectRemediesBlow holeToo fast cooling rate.Wet, unclear or damaged electrode.Too thick base metal.Long or short arc length.Rusted ... Read More

A metal halide lamp, also called mercury halide lamp, is an electric lamp that produces light by an electric arc through a gaseous mixture vaporized mercury and metal halides. The metal halide lamp was invented by Dr. Reiling in 1960.Construction of Metal Halide LampThe construction of a metal halide lamp is shown in the figure below −A metal halide lamp consists of a metal base and a glass shield to protect the internal components of the lamp. Inside the glass shield, there is a series of lamps combined within a single arc tube with output characteristics of different mixtures of ... 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 are classified into the following categories −Individual DriveGroup DriveMulti-motor driveGroup driveWhen several machines are organized on a single shaft and are driven by a single large motor, this system is known as group drive. Group drive is also known as line shaft drive because a large sized motor (called main motor) drives a common shaft. To the common shaft, a number of small ... Read More

IlluminationWhen light falls on a surface, the surface is illuminated and the phenomenon is known as illumination. Mathematically, the illumination is defined as the luminous flux falling on a surface per unit area, i.e., $$\mathrm{\mathrm{Illumination, }\mathit{E}\:=\:\frac{\mathrm{Luminous \:flux}}{\mathrm{Area}}}$$Good Illumination SchemeA good illumination scheme is the one under the influence of which the eyes of a person, using the light, do not feel any strain.For example, if the light is too dim, then one cannot observe the objects properly. On the other hand, if the light is too bright, then eyes start watering and are made to open forcibly. Thus, the good ... Read More

Welding is a skilled work and at the same time it is risky and requires safety equipment and accessories to safeguard the welder. Welders use various types of welding equipment accessories for protection and safety, which we are going to explain in this article.Welding GlovesThe gloves are used for the protection of the welder’s hands and arms.The material used for making the gloves is a good quality thick rubber which is more flexible for hand movements.There are two types of gloves used in welding work viz.: Gauntlet type gloves and Tig type gloves.Tig type gloves are of high weight and ... Read More

A type of electric lamp that produces light by creating an electric arc in the gap between two electrodes when the electric supply is connected to these electrodes is known as arc lamp.Types of Arc LampsArc lamps are classified into following four types, viz −DC Carbon Arc LampAC Carbon Arc LampFlame Arc LampMagnetic Arc LampDC Carbon Arc LampThe construction of the DC carbon arc lamp is shown in Figure-1.In this types of carbon arc lamp, two carbon electrodes are used. These two electrodes are placed touching to each other face to face and a DC supply of voltage of 40 ... Read More

A tungsten halogen lamp, also called halogen lamp, is a developed tungsten filament lamp. The halogen lamp consists of a tungsten filament that is enclosed in an environment of an inert gas and a small quantity of a halogen such as bromine or iodine.The combination of the tungsten filament and halogen results in a chemical reaction known as halogen cycle, which increases the life of the filament and eliminates the drawbacks of an ordinary filament lamp.The halogen lamp was developed by E. G. Fridrich and E. H. Wiley in 1958 by introducing a halogen gas inside the incandescent lamp. The ... Read More

Welding is the process of joining two metals placed together by heating them to melting point. In electric welding, the heat required for welding process is obtained by the use of electrical energy.Factors Considered While Selecting a Welding System for a Particular JobThere are different materials or metals to be welded and different types of welds are required. Therefore, depending upon the metal, its dimensions, and requirements, different welding systems are selected.The following factors are to be considered while evaluating an appropriate welding system to complete a specific job −Types of material (or metal) being weldedThickness of the material.The welding ... Read More