Computer consists of hardware and software

All cpplication softwareomputer programs require an operating system to function. Operating system controls computer's hardware, run the computer's programs and organizes files. Any hardware that can hold information, temporarily or permanently. We distinguish two types of storage: a primary storage device RAM , and a secondary storage device hard drive.

Secondary storage can be removable, internal, or external storage. It stands for random access memory, it keeps the data and general purpose program that the compter is executing at the moment. RAM is not permanent, its contain can be changed and it is erased when the computer is off.

It is the physical arrangement in a computer that contains the computer's basic circuitry and components. Bit is the smallest storage unit in the computer. A bit can store just 0 or 1, which is called binary, and therefore can be stored by physical devices or systems that has two separate states. Notice that a bit has only two coding options, or 2 values.

One bit is too small to be used, and thus computers use a larger storage unit called bytes. Bytes - are made of bits. Scanners and Document readers.

Example are - FlatBed and HandHeld scanners. Usually it's a rectangular box placed on or underneath your desk. Inside this box are many electronic components that process data.

The most important of these components is the central processing unit CPU , or microprocessor , which acts as the "brain" of your computer. Another component is random access memory RAM , which temporarily stores information that the CPU uses while the computer is on. The information stored in RAM is erased when the computer is turned off.

Almost every other part of your computer connects to the system unit using cables. The cables plug into specific ports openings , typically on the back of the system unit.

Hardware that is not part of the system unit is sometimes called a peripheral device. Peripheral devices can be external such as a mouse , keyboard , printer , monitor , external Zip drive or scanner or internal , such as a CD-ROM drive , CD-R drive or internal modem. Internal peripheral devices are often referred to as integrated peripherals. There are two types according to shape: tower and desktop.

A motherboard mainboard , system board , planar board or logic board is the main printed circuit board found in computers and other expandable systems. It holds many of the crucial electronic components of the system, such as the central processing unit CPU and memory , and provides connectors for other peripherals. Funlctions of Control Unit. Kirjaudu Luo tili. They are classified into two classes namely - sytem software and application software Liveware - is the computer user.

Also kwon as orgwareor the humanware. The user commands the computer system to execute on instructions. How the keys are organized The keys on your keyboard can be divided into several groups based on function: Typing alphanumeric keys. These keys include the same letter, number, punctuation, and symbol keys found on a traditional typewriter. Special Control keys. These keys are used alone or in combination with other keys to perform certain actions. Function keys.

The function keys are used to perform specific tasks. They are labelled as F1, F2, F3, and so on, up to F The functionality of these keys differs from program to program. Cursor Movement Navigation keys. These keys are used for moving around in documents or WebPages and editing text.

Numeric keypad. The numeric keypad is handy for entering numbers quickly. The keys are grouped together in a block like a conventional calculator or adding machine. Figure: A Sample of Computer Hardware. Figure: A Sample of Computer Software. Figure: A Sample of Types of Computers. Next Remember While Troubleshooting. About The Author. Related Posts.