tag:blogger.com,1999:blog-58783944807710441602011-08-20T06:36:48.542-07:00This Blog contains articles on semiconductors, diode, transistor, capacitor, resistor and many more.Jameshttp://www.blogger.com/profile/09406939040259813258noreply@blogger.comBlogger151100tag:blogger.com,1999:blog-5878394480771044160.post-31138571498466952552009-01-29T06:31:00.000-08:002009-04-06T12:01:39.589-07:00

Most people who have traveled with an MP3 player or other portable device have had the experience of intruding background noise ruining their listening experience. Noise canceling headphones can be a way of eliminating much of that interfering noise.How do most headphones reduce noise?Many headphones use a passive means of blocking out noise to keep it from reaching a listeners ears. Both the

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Electronic is the study to understand the free flow of charges through number of devices and materials like inductors, resistors, semiconductors, nano-structures, capacitors and vacuum tubes. It is considered to be theoretical part of physics. The construction and designing of different electrical circuits is vital to solve the practical problems in the areas of computer engineering and

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Computer speakers, or multimedia speakers, are external speakers and are usually equipped with a male 1/8 inch stereo jack plug (usually color-coded lime green per the PC 99 standard) for computer sound cards.However, some have an RCA connector, and some people connect the output of their computer sound cards to a conventional stereo system.There are also USB speakers which are powered from the 5

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electric heater is an electrical appliance that converts electrical energy into heat. The heating element inside every electric heater is simply an electrical resistor, and works on the principle of Joule heating: an electric current flowing through a resistor converts electrical energy into heat energy.Domestic electrical underfloor heating:These systems are called radiant heating systems,

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Some resistors are cylindrical, with the actual resistive material in the center (composition resistors, now obsolete) or on the surface of the cylinder (film) resistors, and a conducting metal lead projecting along the axis of the cylinder at each end(axial lead). There are carbon film and metal film resistors. The photo above right shows a row of common resistors. Power resistors come in larger

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The SI unit of electrical resistance is the ohm (Ω). A component has a resistance of 1 Ω if a voltage of 1 volt across the component results in a current of 1 ampere, or amp, which is equivalent to a flow of one coulomb of electrical charge (approximately 6.241506 × 1018 electrons) per second. The multiples kiloohm (1 kΩ = 1000 Ω) and megaohm (1 MΩ = 106 Ω) are also commonly used.In an ideal

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A resistor is a two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in accordance with Ohm's law. : The electrical resistance is equal to the voltage drop across the resistor divided by the current through the resistor. Resistors are used as part of electrical networks and electronic circuits.A resistor is used to

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The television industry's changing of aspect ratios is not without difficulties, and can present a considerable problem.Displaying a widescreen aspect (rectangular) image on a conventional aspect (square or 4:3) display can be shown:1- in "letterbox" format, with black horizontal bars at the top and bottom2- with part of the image being cropped, usually the extreme left and right of the image

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Aspect ratio refers to the ratio of the horizontal to vertical measurements of a television's picture. Mechanically scanned television as first demonstrated by John Logie Baird in 1926 used a 7:3 vertical aspect ratio, oriented for the head and shoulders of a single person in close-up.Most of the early electronic TV systems from the mid-1930s onward shared the same aspect ratio of 4:3 which was

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There are various bands on which televisions operate depending upon the country. The VHF and UHF signals in bands III to V are generally used. Lower frequencies do not have enough bandwidth available for television. Although the BBC initially used Band I VHF at 45 MHz, this frequency is no longer in use for this purpose. Band II is used for FM radio transmissions. Higher frequencies behave more

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Pixel resolution is the amount of individual points known as pixels on a given screen. A typical resolution of 720x480 means that the television display has 720 pixels across and 480 pixels on the vertical axis. The higher the resolution on a specified display the sharper the image. Contrast ratio is a measurement of the range between the brightest and darkest points on the screen. The higher the

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Color television systems were invented and patented even before black-and-white television was working; see History of television for details.Completely electronic television systems relied on the inventions of Philo Taylor Farnsworth, Vladimir Zworykin and others to produce a system suitable for mass distribution of television programming. Farnsworth gave the world's first public demonstration

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Electromechanical techniques were developed from the 1900s into the 1920s, progressing from the transmission of still photographs, to live still duotone images, to moving duotone or silhouette images, with each step increasing the sensitivity and speed of the scanning photoelectric cell. John Logie Baird gave the world's first public demonstration of a working television system that transmitted

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Television was not invented by a single person, but by the contributions of several individuals. The origins of what would become today's television system can be traced back to the discovery of the photoconductivity of the element selenium by Willoughby Smith in 1873 followed by the work on the telectroscope and the invention of the scanning disk by Paul Nipkow in 1884. All practical television

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Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. The term has come to refer to all the aspects of television from the television set to the programming and transmission. The word is derived from mixed Latin and Greek roots, meaning "far sight": Greek "tele", far, and Latin visio-n, sight (from video, vis- to see).

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