computer components info
The Expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard or back plane to add functionality to a computer system via the expansion bus.
Computer data storage, often called storage or memory, refers to computer components and recording media that retain digital data. Data storage is a core function and fundamental component of computers.
Data is stored by a computer using a variety of media. Hard disk drives are found in virtually all older computers, due to their high capacity and low cost, but solid-state drives are faster and more power efficient, although currently more expensive than hard drives, so are often found in more expensive computers. Some systems may use a disk array controller for greater performance or reliability.
To transfer data between computers, a USB flash drive or Optical disc may be used. Their usefulness depends on being readable by other systems; the majority of machines have an optical disk drive, and virtually all have a USB port.
Input and output peripherals
Input and output devices are typically housed externally to the main computer chassis. The following are either standard or very common to many computer systems.
Input devices allow the user to enter information into the system, or control its operation. Most personal computers have a mouse and keyboard, but laptop systems typically use a touch pad instead of a mouse. Other input devices include webcams, microphones, joysticks, and image scanners.
Output devices display information in a human readable form. Such devices could include printers, speakers, monitors or a Braille embosser.
A power supply unit (PSU) converts alternating current (AC) electric power to low-voltage DC power for the internal components of the computer. Laptops are capable of running from a built-in battery, normally for a period of hours.
Turing in 1951, three years before his death
Born Alan Mathison Turing
23 June 1912
Maida Vale, London, England
Died 7 June 1954 (aged 41)
Wilmslow, Cheshire, England
Residence Wilmslow, Cheshire, England
Fields Mathematics, cryptanalysis,computer science, Biology
Institutions University of Manchester