A computer is an electronic machine/device that used to accepts, stores, manipulate data and gives outputs the result to the user. A computer system is composed of hardware and software. Computer Organization, Input unit, Output unit, Secondary storage, Central processing unit, Arithmetic and logic unit, and Memory unit.
COMPUTER CONNECTIONS METHODS
Serial connection: It is a PC connection that transfers data one bit at a time over a single wire. It has either 9-pin or 25-pin. Used in a direct connection between PC to PC, and connecting printers.
Parallel connection: PC connection that transfers data 8-bits at once. It has 25-pin female connectors. Used to connect printers to a system unit.
Universal serial bus (USB) connection: Enables connection of multiple peripherals to a single port with high performance.
Fire wire connections: Connections that provides high speed interface for peripheral devices. It support up to 63 devices on one fire wire port.
Parallel Advance Technology Attachment (PATA) connection: A connection standard that provides a parallel data channel from driver controller to the disk drives. PATA connections are used to connect internal hard drives, optical drives to a motherboard.
Serial Advance Technology Attachment (SATA) connection: Connection that provides a serial data channel between the drive controller and the disk drives. SATA has higher transfer speed than PATA. SATA are smaller, thinner and more flexible than PATA.
High Definition Multimedia Interface (HDMI) connection: HDMI transmits digital video and audio at high speed. It may transfer up to 10 GB/ second.
Ethernet port: Connection for Local Area Network (LAN). Transmit high speed data on local area networks, internet and intranet networks. Example connecting a computer to router.
COMPONENTS OF THE COMPUTER
Primary categories of components in a typical computer are; system unit, display devices, input devices and external devices.
Display devices: These enable users to view the text and graphical data associated with a computer program. They vary in size, shape and technologies used example monitor.
System unit: Is the main component of the computer which houses the devices necessary for the computer to function. It consists of internal components such as the system board, microprocessor, memory modules, disk drives, adapter cards, power supply, fan, and ports for connecting external devices.
Motherboard (system board) this contains many components including CPU where is the brain of computer in which most calculations takes place. The other part is the cooling system which prevent damage to the computer parts by dissipating the heat generated inside a computer classis. And the last one is the Power supply this convert AC powers from an electrical outlet to DC.
Input devices: They enable users to enter data or instructions into a computer example keyboard and mouse. They connect to system via cable or wireless connection.
External devices: These provide alternative input or output methods or additional data. They are also called peripheral devices.
Storage devices: Is a component that enables users to save data for use at later time, examples are hard disks, CD/DVD and floppy disks.