Color Band Resistors Essay Example for Free

Color Band Resistors Essay RESISTOR A resistor is a component of a circuit that resists the flow of electrical current. It has two terminals across which electricity must pass, and it is designed to drop the voltage of the current as it flows from one terminal to the other. Resistors are primarily used to create and maintain known safe currents within electrical components. Resistors are coated with paint or enamel, or covered in molded plastic to protect them. Because they are often too small to be written on, a standardized color-coding system is used to identify them. The first three colors represent ohm value, and a fourth indicates the tolerance, or how close by percentage the resistor is to its ohm value. This is important for two reasons: the nature of its construction is imprecise, and if used above its maximum current, the value can change or the unit itself can burn up. †¢ RESISTANCE In physics, resistance is defined as the ability of a substance to prevent or resist the flow of electrical current. A substance resists electrical current because of a collision between electrons and atoms, which slows the electrons down and converts some of their energy to heat energy. In some cases, the energy is also converted into light. German physicist Georg Ohm (1789-1854) is credited with discovering the effect of a materials make up, length and thickness on its resistance. In fact, the standard unit of measuring resistance, the ohm, is named after him. Ohms law became publicly known in 1827 and states that a circuit’s resistance is 1 ohm if a 1-volt voltage make 1 amp of current. According to Ohms law, a circuits resistance is equal to its voltage divided by the amount of current. †¢ RESISTIVITY The measure of the potential electrical resistance of a conductive material. It is determined experimentally using the equation [pic] = RA/l, where R is the measured resistance of some length of the material, A is its cross-sectional area (which must be uniform), and l is its length. It is measured in ohm-meters. Resistivity of a material remains constant whether it is taken about 1 cm..or 1km (on a constant temperature and other physical conditions remains the same) The Resistivity of a material depends on temperature( and other physical conditions such as air pressure) and the nature of the material (avaibility of free electrons.number of free electrons are same in an element atoms). †¢ TEMPERATURE COEFFICIENT The temperature coefficient is the relative change of a physical property when the temperature is changed by 1 Kelvin. In the following formula, let R be the physical property to be measured and T be the temperature at which the property is measured. T0 is the reference temperature, and ΔT is the difference between T and T0. Finally, ÃŽ ± is the (linear) temperature coefficient. Given these definitions, the physical property is: [pic] Here ÃŽ ± has the dimensions of an inverse temperature (1/K or K−1). This equation is linear with respect to temperature. For quantities that vary polynomially or logarithmically with temperature, it may be possible to calculate a temperature coefficient that is a useful approximation for a certain range of temperatures. For quantities that vary exponentially with temperature, such as the rate of a chemical reaction, any temperature coefficient would be valid only over a very small temperature range. Different temperature coefficients are specified for various applications, including nuclear, electrical and magnetic. 1. What are the uses of resistors? †¢ Resistors are essential in electronic circuits, as they control the amount of current that runs through them. Without resistors voltage would be too great for individual components to handle and would result in overloading or destruction. The principle by which resistors work can also be applied to heating elements in irons, toasters, heaters, electric stoves and hair dryers, which dissipate voltage as heat. Variable resistors may function as sensors, switches or voltage dividers. Specialist end uses, such as new generation automotive LED light clusters, demand a specialist resistor solution. Aluminum clad wire wound resistors provide high power dissipation in a limited space, and are designed for direct heat sink mounting, using thermal compound to achieve maximum performance. The resistors work as a ballast to augment the resistance in the LED, mimicking that of a conventional 2. What is the difference between 4 color, 5 color, and 6 color band resistors? †¢ 4 Color Band Resistors- These resistors have two bands for the resistance value and 1 band for the multiplier and 1 tolerance band. This is the most common variation. †¢ 5 Color Band Resistors- These are with high precision and have an extra band to indicate a 3rd significant digit. The 1st three bands indicate the significant digits, the 4th band is the multiply factor and the 5th represents the tolerance. There are exceptions to this. For example, sometimes the extra band indicates failure rate or temperature coefficient. †¢ 6 Color Band Resistors- These are resistors that are usually for high precision that have an additional band to specify the temperature coefficient (ppm/k). The 1st three bands are for the resistance value, the 4th for the multiplier, the 5th for the tolerance and the 6th for the temperature coefficient. Sources: http://www.wisegeek.com/what-is-a-resistor.htm http://www.wisegeek.com/in-physics-what-is-resistance.htm http://in.answers.yahoo.com/question/index?qid=20100627073410AAvDj3T http://www.thefreedictionary.com/resistivity http://en.wikipedia.org/wiki/Temperature_coefficient http://www.rapidonline.com/infozone/resistors/applications.htm

Batman: Through the Years Essays -- Media Fiction Super Heroes Papers

Batman: Through the Years The Caped Crusader, the Dark Knight, Bruce Wayne, these are all aliases for an enigmatic character in popular culture most commonly known as Batman. While having his humble origins in the pulp magazines of the late 1930’s, over the span of his existence, he has expanded into a full-blown franchise. There have been 3 TV shows on him, 4 movies (1 more still in the making), various videogames, and over 20 comic book series that currently feature his name. Even after 60 years of being in print, it was a Batman issue that was the highest selling comic book of the last week of November, 2004. It is the aim of this project to explore the reasons why this one particular comic book superhero has managed to keep his relevance where so many others have faltered, with a focused look into how Batman artwork has changed over the sixty years of his existence. Who is Batman to you? Almost everybody knows something about Batman, from my Sunday school teacher (who confiscated my Batman comic book calling him ‘devilish’ and ‘violent’) to my little cousins who play the new Batman videogame incessantly. What many people fail to realize though is that the character of Batman has always been evolving, always being modified to fit the purposes of both the medium and the audience. Take for example the Batman television series that lasted from 1966 till 1968. Adam West as Batman, a little lumpy in his Batsuit, would fight crime accompanied by his faithful sidekick, Robin (Burt Ward). They would awkwardly beat up their enemies, (Listen to the classic soundtrack)accompanied by the classic POW! BIFF! WHAM! sound effects and use goofy phrases like, â€Å"†¦if two plus two equals four†¦Quick Robin, to the Batmobile!† In all t... ...ewer is interested in; Bruce Wayne is an after thought. But with a movie, the viewer is forced to see the Bruce Wayne character and on a sub-conscious level is forced to connect that character with the traits one already has of the actor from previous experience, which reduces the mystery of the Batman character. Concluding Thoughts: While the Batman character grown into an international franchise, many of his fellow superhero peers have fallen by the proverbial road side. Riding on his mysterious and dark persona, he is one of the most famous fictional characters of modern times. It is a unique blend of super-hero fantasy and realism that has allowed him to be accepted by such a wide audience, and it is to the credit of his producers that they have been able to mould the character the character to fit their needs while capitalizing on the character’s essence.

Top Glove Information

Tan Sri Dr. Lim Wee-Chai (Appointed Chairman in 2000, aged 49) Chairman Founded Top Glove in 1991, totalling 26 years of experience in the latex industry. Former president of the Malaysian Rubber Glove Manufacturers' Association (MARGMA), board member of the Malaysian Rubber Board, and Director of the Association of Malaysia Medical Industries. Tan Sri Datuk (Dr. ) Arshad Bin Ayub (Appointed in 2000, aged 79) Independent Non- Executive DirectorFormer Deputy Governor of Bank Negara Malaysia, and current Chairman, President and member of various Malaysian rubber insitutions, namely the Malaysia Rubber Export Promotion Counci (MREPC)l, the Rubber Products Manufacturers Association and the Rubber Board. Puan Sri Tong Siew Bee (Appointed in 2000, aged 49) Executive Director Previously worked with United Overseas Bank and Utama Bank, with over 10 years of experience in operational systems in banking.Lim Hooi Sin (Appointed in 2003, aged 45) Executive Director Possesses more than 14 years o f sales experience with Metlife Financial Services in the US, and is the founder of one of Top Glove’s subsidiary companies, Top Glove Medicial USA. Sekarajasekaran a/l Arasaratnam (Appointed 2000, aged 79) Independent Non- Executive Director Has held various engineering positions in government public works and utilities departments over the span of 20 years, and the Board’s nvironmental engineering consutlant. Lau Boon Ann (Appointed 2000, aged 53) Non-Executive Director Involved in the real estate and property development setor, with over 10 years of marketing and consultancy experience with various property companies. Quah Chin Chye (Appointed 2001, aged 52) Independent Non- Executive Director Has held various senior management positions over his 10 years of work experience. Lee Kim Meow (Appointed 2000, aged 48)Executive Director Has more than 12 years of experience in financial services and credit control operations with OCBC Finance and Asia Commercial Finance. H e is currently a member of MARGMA, MREPC, as well the Asean Rubber Glove Manufacturers’ Association (ARGMA). Lim Cheong Guan (Joined in 2005, aged 42) Executive Director Responsible for the accounting, corporate finance and investor relations of the company, with over 10 years of accounting and auditing experience, including a stint at PricewaterhouseCoopers.

Business Functions Of Operations Management - 3020 Words

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