What HDTV Is What HDTV Is Digital describes electronic technology that generates, stores, and processes data in terms of two states: positive and non-positive. Positive is expressed or represented by the number 1 and non-positive by the number 0 (Lasica). Data that is transmitted or stored with digital technology is expressed as a string of 0's and 1's. Each of these digits is referred too as a bit (and a string of bits that a computer can address individually as a group is a byte). Prior to digital technol
Keyboards Keyboards A key board is simply a way that the user may interface a fixed number of commands (equal to the number of keys that the manufacturer places on the board). The standard keyboard for home PCs is a QWERTY key board, but they are not restricted to this format as in industry they can be used to send different common commands to a computer for example a farm may have a key board controlling the environmental setting in the sheds with a button to dim the lights or turn them up or a button t
DVD WHAT IT DOES DVD: WHAT IT DOES DVD, which simply stands for Digital Video Disc (or Digital Versatile Disc) is the latest audio/video storagemedium to hit the market. DVD discs look exactly like normal compact discs and they possess the technology to provide hours of high quality video and audio entertainment. DVD: HOW IT WORKS Although complex, the basics of how a DVD works is rather simple, even comparable to how old vinyl record albums function. A DVD disc spins at a very high rate, and a laser beam rea
Data Storage Devicesdata Storage Devices Even before the first computer was conceptualized, data had already been stored on hard copy medium and used with a machine. As early as 1801, the punched card was used as a control device for mechanical looms. One and one-half centuries later, IBM joined punched cards to computers, encoding binary information as patterns of small rectangular holes. Today, punch cards are rarely used with computers. Instead, they are used for a handful of train tickets and election ballots.
How Magnets Affect Computer DisksHow Magnets Affect Computer Disks BackGround One of the most commonly used Computer data storaged mediums is a Computer Disk or a Floppy. These are used in everyday life, in either our workplace or at home. These disks have many purposes, such as: Storing data: Floppies can be used to store software/data for short preiods of time, Transferring data: Floppies are used to transfer/copy data from one computer to another. Hiding data: Floppies are also sometimes used to hide sensitive or confidentia
Optical Storage MediumsOptical Storage Mediums James Ng The most common way of storing data in a computer is magnetic. We have hard drives and floppy disks (soon making way to the CD-ROM), both of which can store some amount of data. In a disk drive, a read/write head (usually a coil of wire) passes over a spinning disk, generating an electrical current, which defines a bit as either a 1 or a 0. There are limitations to this though, and that is that we can only make the head so small, and the tracks and sectors so clo
How Is Helium ProducedHow Is Helium Produced? Production: Although Helium is one of the most common elements in the universe it is a rare gas on earth. It exists in the atmosphere in such small quantities (less than five parts per million) that recovering it from the air is uneconomical. Helium is produced as a by-product of the refining of natural gas, which is carried out on a commercial scale in the USA and Poland. In these areas natural gas contains a relatively high concentration of Helium which has accumulate