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Produce hard copies of documents and files. Printers vary in how they produce an image, which has a direct effect on the quality of the printout and the cost of the printer.

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Come in many forms, from simple ear phones to complex multi-speaker arrsngements . Have essential functions in other areas

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Are found in almost all computer system .

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Are used for locating or tracking objects. They emit very high frequency radio signals which can be picked up and located by a receiver.

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They are a relatively low resolution video camera. Many modern laptops have web cams built into their screens, and external models can also be bought

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Have gradualy replaced film models over the last decade. Although many digital cameras could be considered computers in their own right.

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Are used for measuring some aspect of the physical world, such as humidity, temperature, light, or pH.

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Is a device for digitizing a piece of paperbeing scanned is stored as a standard image file. This happens even if the page being scanned contains text

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Is a specialised technology that uses ink containing iron particles, making it magnetic.

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Is an input method for speedily reading and counting multiple choice style answer papers.

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They are platic credit cards style cards that differ from normal dumb magnetic stripe cards by having a higher storage capacity and an embedded processor.

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They are the bank cards, hotel key, credit cards and some frequent traveller cards .

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It uses a laser to shine light onto a barcode label. The thicknessof the lines and the spacing between the lines on the barcode determine the amountof reflected light.

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Joysticks and game pads are the most common input devices used by game players. There are many different configurations available including a variety of buttons and features.

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They allow sound data to be input into the computer. The microphones allows the user to talk between two computers over the internet.

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They allow users to interact with computers using their hand or a specially designed pen called stylus, they are often used in airports or in self service photo tasks

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Are common input devices on laptops, where there is usually not enough space for a mouse. Multi touch touch pads allow more complex actions to be performed using several fingers.

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It consists of a relatively large ball which is fixed in place so that the user can spin it around, controling the pointer on the screen.

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A mouse is the standard pointing device on most desktop computers. A typical computer mouse has two butons and many also have a scroll wheel in the centre to perform tasks like scrolling through documents or web pages.

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Is akeyboard that is represented by a series of buttons drawn on a monitor or screen. The user select options using a pointing device like a mouse, or a touch screen.

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On this keyboard each key is programmed to perform a custom function.Typically there are no pre-set such nas numbers or letters.

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They are presented on vitually all laptop and desktop computers they are use to type and write in different devices like computers or also in smart phones.

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Is a specialised computer Which is hidden inside another device. You can found them in cars, smaller portable devices like digital watches, digital cameras, and GPS systems.

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They usually include built in general cameras, many can also run apps, send mssages, and made voice calls

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The PDAs usuallyu have larger screens than mobile phones. The screen contains a for touch input. In the mayority of the cases there is a pen called stylus. Also they have access to internet .

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Netbooks are laptop computer with lower specifications than normal, designed for maximum portability. They are not designed to be the primary machine for office work, this computers tipically have a very slow processor and a small, and low resolution screen.

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This term covers a wide range of portable computers. Laptops generally feature a standard keyboard, an LCD screen of between 14 and 17 inches, and a WI-FI card to allow wireless access to the internet

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This type of computers is common in homes, offices, and schools because they are cheap compared to the laptops. Are mopre comfortable for using during long periods of time . Another advantage is that this computers use generic parts with sandard and interfaces.

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Are very powerful computers which share many features with supercomputers. Mainframes are optimised fir high data throughout. This menas they are able t read extremely large amounts of data from storage, prcess it, and store the results very quickly.

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They represent the cutting edge of computing technology, this type ofo computers are the fastest, most powerful and most expensive available, they are multiprocessing, with hundreds of separate processors, theyy have thousands of gigabytes of primary storage and many terabytes of second storage.