File Name: what is computer and types of computer .zip
Hardware refers to the physical, tangible computer equipment and devices, which provide support for major functions such as input, processing internal storage, computation and control , output, secondary storage for data and programs , and communication. A computer system is a set of integrated devices that input, output, process, and store data and information.
Computer systems are currently built around at least one digital processing device. There are five main hardware components in a computer system: Input, Processing, Storage, Output and Communication devices. Are devices used for entering data or instructions to the central processing unit. Are classifie according to the method they use to enter data. Keyboard similar to a typewriter is the main input device of a computer. It contains three types of keys-- alphanumeric keys, special keys and function keys.
F5 reloads a page of an internet browser. The function of each and every key can be well understood only after working on a PC. When any key is pressed, an electronic signal is produced.
This signal is detected by a keyboard encoder that sends a binary code corresponding to the key pressed to the CPU. There are many types of keyboards but keys keyboard is the most popular one.
T he items to be entered are selected by either pointing to or clicking on them. Although mice come in many shapes, the typical mouse does look a bit like an actual mouse. Some newer mice are wireless. A mouse usually has two buttons: a primary button usually the left button and a secondary button.
Many mice also have a wheel between the two buttons, which allows you to scroll smoothly through screens of information. When you move the mouse with your hand, a pointer on your screen moves in the same direction.
The pointer's appearance might change depending on where it's positioned on your screen. When you want to select an item, you point to the item and then click press and release the primary button. Pointing and clicking with your mouse is the main way to interact with your computer.
There are several types of mice: Mechanical mouse, optical mouse, optical-mechanical mouse and laser mouse. A mouse typically has two buttons: a primary button usually the left button and a secondary button usually the right button. The primary button is the one you will use most often. Most mice also include a scroll wheel between the buttons to help you scroll through documents and WebPages more easily.
On some mice, the scroll wheel can be pressed to act as a third button. Advanced mice might have additional buttons that can perform other functions. Holding and moving the mouse. Place your mouse beside your keyboard on a clean, smooth surface, such as a mouse pad. Hold the mouse gently with your index finger resting on the primary button and you thumb resting on the side.
To move the mouse, slide it slowly in any direction. Don't twist it—keep the front of the mouse aimed away from you. As you move the mouse, a pointer see picture on your screen moves in the same direction. If you run out of room to move your mouse on your desk or mouse pad, just pick up the mouse and bring it back closer to you. Pointing to an object often reveals a descriptive message about it.
The pointer can change depending on what you're pointing at. For example, when you point to a link in your web browser, the pointer changes from an arrow to a hand with a pointing finger. Most mouse actions combine pointing with pressing one of the mouse buttons. There are four basic ways to use your mouse buttons: clicking, double-clicking, right-clicking, and dragging.
To click an item, point to the item on the screen, and then press and release the primary button usually the left button. Clicking is most often used to select mark an item or open a menu. This is sometimes called single-clicking or left-clicking. To double-click an item, point to the item on the screen, and then click twice quickly.
If the two clicks are spaced too far apart, they might be interpreted as two individual clicks rather than as one double-click. Double-clicking is most often used to open items on your desktop.
For example, you can start a program or open a folder by double-clicking its icon on the desktop. To right-click an item, point to the item on the screen, and then press and release the secondary button usually the right button. Right-clicking an item usually displays a list of things you can do with the item.
For example, when you right-click the Recycle Bin on your desktop, Windows displays a menu allowing you to open it, empty it, delete it, or see its properties. If you are unsure of what to do with something, right-click it.
They are classifie according to the technology used to capture data e. 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. 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. Basic parts A mouse typically has two buttons: a primary button usually the left button and a secondary button usually the right button. Holding and moving the mouse Place your mouse beside your keyboard on a clean, smooth surface, such as a mouse pad.
Clicking single-clicking To click an item, point to the item on the screen, and then press and release the primary button usually the left button.
Double-clicking To double-click an item, point to the item on the screen, and then click twice quickly. Right-clicking To right-click an item, point to the item on the screen, and then press and release the secondary button usually the right button. Tower System Unit Desktop System Unit A motherboard mainboard , system board , planar board or logic board is the main printed circuit board found in computers and other expandable systems. Computer Studies. Form 1. Introduction to computers.
Operating System. The Computer System. FORM 2. Form 3. Form 4.
Patrick, a computer technician, is a dedicated writer who wishes to make the world better by informing individuals who seek more knowledge. Wikimedia Commons. We have four different computer types classified according to their performance, power, and size. A computer is an electronic device that accepts data, processes it, stores data, and then produces an output. In this article, we are going to have a look at the differences between super, mainframe, mini, and microcomputers. Supercomputers are very expensive and very fast. They are the most powerful computers we have in the world.
Computer , device for processing, storing, and displaying information. A computer is a machine that can store and process information. Most computers rely on a binary system that uses two variables, 0 and 1, to complete tasks such as storing data, calculating algorithms, and displaying information. Computers come in many different shapes and sizes, from handheld smartphones to supercomputers weighing more than tons. Many people throughout history are credited with developing early prototypes that led to the modern computer.
Computers can be classified, or typed, in many ways. Some common classifications of computers are given below. Microcomputers became the most common type of computer in the late 20th century. The best-known early system was the Altair , introduced in The term "microcomputer" has practically become an anachronism. Minicomputers colloquially, minis are a class of multi-user computers that lie in the middle range of the computing spectrum, in between the smallest mainframe computers and the largest single-user systems microcomputers or personal computers. The term supermini computer or simply supermini was used to distinguish more powerful minicomputers that approached mainframes in capability.
A minicomputer , or colloquially mini , is a class of smaller computers that was developed in the mids   and sold for much less than mainframe  and mid-size computers from IBM and its direct competitors. The class formed a distinct group with its own software architectures and operating systems. Minis were designed for control, instrumentation, human interaction, and communication switching as distinct from calculation and record keeping. Many were sold indirectly to original equipment manufacturers OEMs for final end use application. During the two decade lifetime of the minicomputer class — , almost companies formed and only a half dozen remained.
A computer is one type of machine manage different kinds of programs to perform useful tasks to the users. Computer gives proper response to the users through the set of instructions arranged in proper order. It has storage capacity along with execution benefits. Computers can perform both complex and simple operations.
A mainframe computer , informally called a mainframe or big iron ,  is a computer used primarily by large organizations for critical applications, bulk data processing such as the census and industry and consumer statistics , enterprise resource planning , and large-scale transaction processing. A mainframe computer is larger and has more processing power than some other classes of computers, such as minicomputers , servers , workstations , and personal computers. Most large-scale computer-system architectures were established in the s, but they continue to evolve. Mainframe computers are often used as servers. The term mainframe derived from the large cabinet, called a main frame , [ citation needed ] that houses the central processing unit and main memory of early computers.
Supercomputers are the fastest and the most expensive computers. These huge computers are used to solve very complex science and engineering problems.
Examples are speakers and headphones. Mainframes can add or hot swap system capacity non disruptively and granularly. Examine the characteristics or attributes of information quality. By airlines for making flight arrangements. C, Cobol, Fortran and Pascal as some of the major computer languages.
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