Unit 2 P1

Internal system unit components:

• Processors - A central processing unit is an important part of almost every computer. The CPU sends signals to control the other parts of the computer. The CPU works on a list of instructions to do.

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  Motherboard -  The motherboard is the main circuit board in a computer. It is the central part of a computer. All of the different parts of the computer are connected to the motherboard. This allows them to work together.

• BIOS - BIOS stands for Basic Input/output System. The BIOS is a computer program that is embedded on a chip on a computer's motherboard that recognizes and controls various devices that make up the computer. The purpose of the BIOS is to make sure all the things plugged into the computer can work properly.

• Power supply -A power supply unit converts AC power and converts it to DC for the internal components of a computer. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.

• Fan and cooling -A computer fan is any fan inside used for cooling, it is used to expel warm air from inside, or move air to cool a particular component

• SATA - SATA is the faster version of the original PATA interface. SATA is a integrated drive electronics (IDE) device. This means the controller is in the drive. Therefor only a simple circuit is required on the motherboard.

• USB Ports - The Universal Serial Bus is technology that allows a person to connect an electrical device to a computer. USB can also provide a small amount of power to the attached device. Devices that only need a little power can get the amount they need.

• Internal memory -The computer memory is a temporary storage area. It  can hold data and instructions for the Central Processing Unit. Before a program can be run the program needs to be loaded from some storage onto the memory. This then allows the CPU direct access to the program.

• Network and graphic cards - Network card is an electronic device that connects a computer to a computer network. It is considered a piece of computers hardware. A graphics card is a circuit board that controls what is shown on the computer’s monitor and calculates 3D images and graphics.

Peripherals:

• Printer - A printer is a piece of hardware for a computer. It is a device that must be connected into a USB port which allows a user to print items. It can also work with digital cameras to print directly without the use of a computer.

• Scanner - In computing, an image scanner is a device used to transfer images or text into a computer. In the computer the signal produced from the scanner is transferred into a digital image. This image can then be edited or printed.

• Twisted pair cabling - Twisted pair cabling is a type of wiring. Which two conductors in a single circuit are twisted together for the purposes of cancelling out electromagnetic interference from external sources.

Backing Storage:

• Pen drive - A USB flash drive (Universal Serial Bus) is a popular way to store digital information. Flash drives are an easy way to share data. The USB plug on a flash drive joins it with the USB port in another device. They are called Flash drive because they use flash memory to store files. Flash memory is a type of computer chip.

• Hard drive - The hard drive is something used in computers to store information. Hard disks use magnetic recording to store information on rotating circular platters. The capacity of a hard drive is usually measured in gigabytes.