Презентация практического занятия по английскому языку

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Printer is an input device displaying information on a sheet of paper.

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It is one of the most necessary devices in life. Computers would not have spread as far and the accounting profession would be more in demand without it, . There are several types of printers, each of them has its advantages and disadvantages.

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Laser printer A laser printer rapidly produces high quality text and graphics. As with digital photocopiers and multifunction printers, laser printers employ a xerographic printing process but differ from analog photocopiers in that the image is produced by the direct scanning of a laser beam across the printer's photoreceptor.

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+ High speed. High resolution. Laser prints are immune to fading and abrasion, and yet they are not afraid of moisture. - Poor quality halftone images. When operating this printer produces ozone. High price.

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Dot Matrix Printers The dot matrix printer uses a print head that runs back and forth, or in an up and down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like the print mechanism on a typewriter.

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However, unlike a typewriter or daisy wheel printer, letters are drawn out of a dot matrix, and thus, varied fonts and arbitrary graphics can be produced.

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+ The low cost of consumables. Unpretentiousness to the type and quality of the paper. - Print speed is slow. Noise. Print quality is poor.

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Dye-sublimation printer A dye-sublimation printer (or dye-sub printer) is a computer printer which employs a printing process that uses heat to transfer dye onto medium materials such as a plastic card, paper, or fabric. The sublimation name is applied because the dye transitions between the solid and gas states without going through a liquid stage.

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These are the most popular printers in use today. There are others, but they are not as effective.