unit 7 Output devices

keyboard Keep this directly in front of you and within easy reach.

Monitor screen Keep this level whit your eyes . Don’t have it level with the desk . Make sure it is flicker-free and that you can read everything easily . Avoid any glare from the window.

lamp Make sure this lights your work and not the screen.

copyholder Don’t get a stiff neck . Use this when you enter a lot of data.

chair This should be adjustable and provide good back support.

footrest Use this if your feet do not rest flat on the floor.

printer This should be more than a meter away form you and as quiet as possible.

Printers colour price Noise level Running costs speed Print quality Type no cheapest cheap slow low Dot-matrix yes A bit more quiet expensive Relatively slow inkjet Too much fast best laser

Read a monitors ad

price The price mainly depends on the screen size. Common monitor sizes are 14-inch, 17-inch, 17-inch, and 21-inch.the price also depends on aperture grill pitch, resolution, and the number of controls.

Screen size The size of the screen is the diagonal distance form one corner to another. The actual area for images is smaller than this.

Aperture grill pitch This controls the space between the dots which make up the image. The less space the dots. The better the display. Most monitors offer 0.28mm dot pitch but some go as high as 0.31mm or as low as 0.25mm.

Maximum resolution The quality of the display depends on the number of dots which make up the image. The more dots, the better the display.

Refresh rate The monitor refreshes the image on the screen all the time. The faster this happens, the less the screen flickers. You should have a refresh rate of at least 72Hz

Safety standards These are international standards to control harmful signals.

Power-saving feature The power the monitor uses automatically reduces when it is not in use.

On-screen menu Digital controls on the screen allow you to adjust the image.

Type of printer Dot-matrix Mono laser Mono inkjet Colour inkjet Colour laser

Work in pairs. Study this flowchart for choosing a printer Work in pairs. Study this flowchart for choosing a printer. Decide which is the best kind of printer for these users. Someone who needs to: 1-matrix printer 2-mono laser 3-laser printer 4-mono printer 5-inkjet printer 1-print forms with two parts 2-print high quality black and white copies 3-print a lot of co lour photos in a short time 4-print a few copies_ colour and speed are not important 5-print a few pages in colour

yes Do you need to print on multi-part forms Buy a dot-matrix printer. no yes yes Do you need to print in colour? Do you need a fast printer Buy a colour laser printer. no no Buy a colour inkjet printer yes Are print speed or quality important? Buy a mono laser printer. no Buy a mono inkjet printer.

Fill in the gaps in this comparison of printers? There are three different types of printer: dot-matrix, inkjet, and laser. Dot-matrix printers are the ………kind of printer, ………their print quality is low and they are slow and ………they are ………to run. Inkjets are ………expensive, but you get ………quality and quieter operation. However, they are relatively ………and also ………to run. They are a good choice for colour. Laser printers give the ………quality of output. They print ………than either of the tow ………of printer and they cost ………to run than inkjet. Unfortunately, they ………almost twice as ………as an inkjet.

There are three different types of printer: dot-matrix, inkjet, and laser. Dot-matrix printers are the cheapest kind of printer, But their print quality is low and they are slow and noisy they are cheap to run. Inkjets are more expensive, but you get quality quality and quieter operation. However, they are relatively slow and also expensive to run. They are a good choice for colour. Laser printers give the best quality of output. They print faster than either of the tow types of printer and they cost less to run than inkjet. Unfortunately, they cost almost twice as much as an inkjet.

Name of the schoolboys 1-ahmed kheiame 2-fahd aljehani