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Transformers

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  INTRODUCTION   A transformer transfer wlectrical energy from one circuit to another through intuitively coupled conductors. It is widely used to change the voltage and currents can either be increase or decrease as per required. A transformer has no moving parts. WORKING PRINCIPLE OF TRANSFORMER A transformer is a static device wich means of wich electric power in one circuit in transformed to another circuit without a change in frequency. CONSTRUCTION OF TRANSFORMER The transformer is very simple and durable in construction and consists of magnetic circuit linking with two winding known as primary and secondary winding. The following are the main components of the transformer as shown in figure.   Core Transformer core is constructed from thin sheet of high grade Silicon with 4% of silicon. The sheets are laminated and they are coated with an oxide layer to reduce the iron losses. The purpose of the core is provide a magneti
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Fire- Types- Extinguishers

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  Fire  Fire is the burning of combustible material. A fire in an unwanted place and on occasion and in an uncontrollable quantity can causes damage or destroy property and materials. It might injury people ad sometimes cause loss of life as well. Hence every effort must be made to prevent fire. When a fire out break is discovered, it must be controlled and extinguished by immediate corrective action. Is it possible to prevent fire? Yes, fire can be prevented by eliminating anyone of the three factors that causes fire. The following are the three factor that must be present in combination for a fir to continue to burn.( Fig 1)      Fuel:  Any substance liquid, solid, or gas will burn, if there is oxygen and high enough temperature. Heat:  Every fuel will begin to burn at certain temperature.It various and depends on the fuel. Solid and liquids give off vapor when heated, and it is this vapor which ignites.Same liquids do not have to be heated as they give off vapor at normal room tempe
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SAFETY PRACTICE

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  Responsibilities  Safety doesn't just happen - it has  to be organised and achieved like the work-process of which it forms a part.the law states that both an employer and his employees have a responsibility in this behalf. Employer's responsibilities  The effort a firm puts into planing and organizing work training people engaging skilled and competent workers maintaining plant and equipment and checking inspecting and keeping record- all of this contributes to the safety in the workplace. The employer will be responsible for the equipment provided the working condition what the employees are asked to do and the training given. Employee's responsibilities  You will be responsible for the way you use the equipment how you do your job the uses you make of your training and your general attitude to safety. A great deal is done by employers and other people to make your working life safer;but always remember you are responsible for your own actions and the effect they have o
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SAFETY RULES IN ELECTRICAL FIELD

Necessity (need) Of Safety Rules: Safety consciousness in one of the essential attitudes required for any job. A skilled electrician always should try to from safe working habits. Safe working habits always save men, money and material. Unsafe working habits always end u in loss of production and profit personal injury and even death. the safety hints given below should be followed by Electrician to avoid accidents and electrical shock as his job involves a lot of occupational Danger. the listed safety rules should be learnt, remembered and practiced by every electrician. Here a  electrician should remember the famous proverb.   "Electricity is a good servant but a bad master". Safety rules   Only qualified persons should do electrical work. Keep the work shop floor clean and tools in good condition  and keep proper places. Do not work on live circuit;if unavoidable use rubber gloves mats,etc. Use wooden or PVC insulated handle screwdrivers when working on electrical circuit
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