through an electron gun A V-shaped tungsten filament (I) is heated electrically to about 2700Kand the high temperature causes many of the electrons in the tungsten to become sufficiently excited for them to escape. This process is called "thermionic emission". Once freed the electrons would be quickly recaptured by the filament‚ because in losing them‚ it will have become positively charged. Applying a high negative voltage (typically 2-25 kV) between the filament and a nearby earthed anode disc
Premium Electron Scanning electron microscope Electron microscope
SYLLABUS BREAK UP FOR STD X |Subjects |1st Assessment |2nd Assessment |1st Prelims | |English I |*Essay writing |*Essay writing |*Essay writing | | |*letter writing (formal/informal) |*letter writing (formal/informal) |*letter writing (formal/informal)
Premium Universal Declaration of Human Rights
reasons. The magneto-hydro-dynamic (MHD) power generation is one of the examples of a new unique method of power generation. The other non-conventional methods of power generation may be such as solar cells‚ fuel cells‚ thermo-electric generator‚ thermionic converter‚ solar power generation‚ wind power generation‚ geo-thermal energy generation‚ tidal power generation etc. This paper elucidates about Different Energy sources‚ why we are going for non-conventional energy sources
Premium Fuel cell Electrochemistry Energy development
Air Transport Industry in Hong Kong Overview As one of the regional hubs for Asia‚ Hong Kong is connected with most urban centres in Asia and half of the world’s population within 5 hours of flight time. Currently‚ more than 100 airlines operate about 1‚000 flights daily‚ linking the Hong Kong International Airport (HKIA) to about 180 destinations worldwide including 48 cities on the Chinese mainland. Handling 56.5 million passengers and 4.03 million tonnes of cargo and in 2012‚ HKIA was Asia’s
Premium World's busiest airports by passenger traffic Hong Kong Cathay Pacific
1.0 Introduction 1.1 What is Semiconductor A semiconductor is a solid whose electrical conductivity can be controlled over a wide range‚ either permanently or dynamically. Semiconductors are tremendously important technologically and economically. Silicon is the most commercially important semiconductor‚ though dozens of others are important as well. 1.2 What is Semiconductor Industry The semiconductor industry is the collection of business firms engaged in the design and fabrication of
Premium Integrated circuit Manufacturing Hard disk drive
AFFILIATED INSTITUTIONS ANNA UNIVERSITY‚ CHENNAI REGULATIONS - 2009 II TO IV SEMESTERS (FULL TIME) CURRICULUM AND SYLLABUS M.E. ENERGY ENGINEERING SEMESTER II SL. COURSE No CODE THEORY 1 EY9321 2 TE9250 3 TE9222 4 E2 5 E3 6 E4 7 EY9324 PRACTICAL 8 EY9325 COURSE TITLE Energy Conservation in Electrical Systems Renewable Energy Systems Instrumentation For Thermal Systems Elective II Elective III Elective IV Seminar Simulation Laboratory L 3 3 3 3 3 3 0 T 0 0 0 0 0 0 0 P 0 0 0 0 0 0 2 3 5 C 3 3
Premium Solar energy Photovoltaics Nuclear power
Microwave Oven Who invented the Microwave oven Percy Spencer invented the first microwave oven after World War II from radar technology developed during the war. Named the "Radarange"‚ it was first sold in 1946. Raytheon later licensed its patents for a home-use microwave oven that was first introduced byTappan in 1955‚ but these units were still too large and expensive for general home use. The countertop microwave oven was first introduced in 1967 by the Amana Corporation‚ which was acquired in
Free Microwave oven Microwave Cooking
Rudimentary calculating devices first appeared in antiquity and mechanical calculating aids were invented in the 17th century. The first recorded use of the word "computer" is also from the 17th century‚ applied to human computers‚ people who performed calculations‚ often as employment. The first computer devices were conceived of in the 19th century‚ and only emerged in their modern form in the 1940s. First general-purpose computing device A portion of Babbage’s Difference engine. Charles
Premium Computer
Revision Checklist for O-Level Physics 5054 Guide for Students www.XtremePapers.net REVISION CHECKLIST for O Level Physics 5054 A guide for students How to use this guide The guide describes what you need to know about your O level Physics examination. It will help you to plan your revision programme for the written examinations and will explain what the examiners are looking for in the answers you write. It can also be used to help you to revise by using the tick boxes in Section 3‚ ‘What
Premium Energy
INTRODUCTION Wouldn’t it be nice to have your home take care of your thing for you‚ automatically‚ without you having to lift a finger? You bet it would. This is the promise of Home Automation. There are many different systems‚ especially in larger homes‚ that can benefit from being integrated. Some of these systems include security alarm‚ HVAC‚ audio/video & lighting. Home automation integrates together‚ enabling them to function more efficiently‚ improve functionality‚ conserve resources & enhance
Premium Resistor