Input devices and media.ppt(lowerskl)

This is the most common input device available on almost every computers. It has a series of keys similar to typewriter. Each key has a letter, number, symbol or word on it. The user presses the key (or combination of keys) desired, causing special code to added to the keyboard buffer.

A mouse is a hand-held device that is moved on the surface of the desk or on a mouse pad. It has a ball underneath and usually two or more buttons (and maybe a wheel) on the top. When the mouse is moved, this causes the ball to moved. As the ball moves, the mouse pointer moves on the screen.

This is a device with a stick perpendicular to its base as well as buttons on the stick and/ or the base. The joystick used as a computer input device and is often designed for playing games.

This is a device that senses the presence of pencil and pen marks that are made on special forms. Such forms have several options with circles next to them. It is especially used to mark multiple choice exams.

This is a device that senses the presence of text by recognizing the characters. When the document is scanned, photo-electrical indication of the characters involved. It is a fast method of data entry for documents that have already been typed/written. This is used for capturing airline tickets data.

This is a device that is used to scan images and text into the computer. There are two types- flatbed and hand-held. With the hand-held version, the scanner is dragged over the image or text in order to scan it. When documents are scanned, it is imported into special software as an image (even if the document is plain text).

This is a device that functions in much the same way as the microphones you see used on stage. However, it does not usually look the same because it is designed so that the user does not have to hold it while he/she is speaking. When you talk, your sound waves cause a diaphragm to vibrate. These vibrations are converted to electrical impulses that are then transmitted to the computer.

Keyboard Optical Mark

Reader

Scanner Microphone Mouse

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What is the numerical part of the keyboard called?

What are the keys at the top of the keyboard called?

Give three main uses of the keyboard

Which device can a keyboard be compared to?

Which part of the keyboard is mostly used by computer users

What is the main use of the optical Mark reader?

One benefit of using the optical Mark Reader.

What is the OMR sensitive it to?

If the item is not shaded properly what would happen to that item?

How does the OMR works?

Name the two main types of scanners.

How does the flat – bed scanner works?

How does the hand-held scanner works?

Three items that a scanner can scan

One disadvantage of a scanner

One function of the microphone

Define what is a microphone

How does a microphone transmit to a computer?

One benefit of using a microphone to record sound.

One disadvantage of using a microphone to record sound.

What is a mouse?

What is the name of the item that the mouse normally functions on?

How does a mouse work?

One advantage of using the mouse

One disadvantage of using the mouse.