An optical cable is used to transfer signals using light through thin, flexible glass fibers known as optical fibers. This method of data transmission is extremely fast because light travels faster than anything else in the known universe.
A:Used laptops and personal computers can be sold locally at garage sales, flea markets, consignment and pawn shops and through classified ads in local newspapers. Used laptops and PCs can also be sold on the Internet through retail sites that allow private sales, including Amazon, eBay and Bonanza.
A:Notebook computers are smaller than laptops and usually weigh less than 6 pounds whereas laptops weigh up to 18 pounds. Laptops also typically have more functionality, including desktop accessories like DVD drives.
A:Random Access Memory, or RAM, is used by computers to store and access information using a random order. This resource provides a temporary way for computers to process electronic data, while making computers more responsive and helping operate memory-intensive programs. RAM chips are only capable of storing and accessing information when electrical power is present.
A:A computer's processor is the control center for the computer, and it carries out the computations that allow the computer to function. The circuits in this central processing unit (or CPU) send commands to the other components of the computer to run programs, accept input and produce output.
A:A computer mouse may freeze or become unresponsive because of accumulated dirt, use of the wrong settings or a bad surface. An incompatible driver, a loose cable or interference from other input devices may also cause the computer mouse to function abnormally.
A:A hard disk drive, also known as a hard drive or HDD, is used to store data long term. Data can include the computer's operating system and applications as well as personal files including photographs, documents and music. When a computer is booted up, or turned on, the computer access the hard drive to load the operating system, such as Windows, OSX or Linux.
A:Microprocessors are used in servers, desktop computers, laptops and mobile devices. They are popular in embedded devices, which traditionally use microcontrollers. Microprocessors were named to set them apart from larger processors used in the middle of the 20th century.
A:A CPU is the brain of a computer, according to About.com's Tim Fisher. Short for "central processing unit," the CPU interprets commands before executing them. The CPU is also called a processor or central processor.
A:Examples of computer hardware include central processing units, motherboards, random access memory, video cards, power supplies, hard drives, optical drives, keyboards, monitors, mice and speakers. Computer hardware is all the physical components of a computer as opposed to the digital components, such as software.
A:A motherboard provides the connection between all other computer parts. Processors are attached directly to the motherboard, and the RAM, peripherals and storage devices are attached as well. Motherboards themselves, however, perform no computation and do not store information.
A:A computer processing cycle refers to the processes that take place in a computer from the time data is entered into the computer through an input device to the time that results are presented to the end user for consumption. There are four basic steps that make the computer processing cycle.
A:Convert keystrokes per hour to words per minute by dividing keystrokes per hour by 250. According to Coleman Data Solutions, the approximate ratio between keystrokes per hour and words per minute, or WPM, is 250 to 1.
A:Uploading is when a user copies a file from his computer to another location, and downloading is when a user copies a file to his computer from another source. When one user uploads a file to a network, other users with access to the network are then able to download that same file.
A:The modern keyboard is not arranged in alphabetical order because millions of users have already learned the QWERTY keyboard layout, which is named after the first six letters in the top row of keys. The reason behind the development of the QWERTY layout as opposed to an alphabetical layout is debated, but two primary theories are accepted explanations.
A:The Michelangelo virus was a boot-sector computer virus that was spread through infected floppy disks. The virus copied itself if an infected floppy disk was left overnight inside a computer. At restart, the computer then booted up the floppy disk and copied the virus to the hard drive.
A:There are many different types of microcomputers, such as personal computers, tablet computers, smartphones and servers. Any type of computer or device that has a microprocessor chip is a microcomputer.
A:If everything on a computer screen has turned sideways, the culprit is likely to be someone attempting to pull a prank; a quick combination of keystrokes changes the orientation of a computer's screen. It is startling and disorienting to see the screen display turned sideways, but it does not mean that something terrible or irreparable has happened to the computer.
A:Computer literacy is important because most companies perform daily duties in an increasingly digitized manner. Employees that are comfortably and confidently able to master many computer programs are highly desired. To develop computer literacy or enhance skill-sets, basic computer courses and software tutorials are key to bolstering marketable skills.