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21 Cards in this Set
- Front
- Back
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name 6 input devices |
keyboard, mouse, digitizer, microphone, scanner, touch sensitive devices |
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what does a keyboard have? |
a keyboard has a set of alphabet keys,a set of digit keys and various function keys |
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why does keyboard have those keys? |
so that the data entered by the person operating the keyboard is in the form of individual letters, word and numbers |
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what happens when you press a key on the keyboard? |
a number or code is sent to the computer to tell it which key you have press |
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what is the disadvantage of a keyboard? |
it is easy to make mistakes by hitting the wrong key |
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where can other special keyboards designed to do one job be found? |
they can be found on game consoles children's toys and programmable robots |
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what is a mouse? |
it is a pointing input device commonly used to draw pictures into a computer |
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how the mouse work? |
if moved along a flat surface the pointer on the screen moves in the same direction |
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if a mouse has two buttons what are their functions |
the left button is used to selecttext and the right one is used to access menu |
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what are the different types of mouse |
opticle, mechanical and cordless |
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what is a opticle mouse |
this uses opticle system to track its movement |
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what is a mechanical mouse |
it has a rubber ball underneath it so it rolls smoothly in all directions |
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what is a cordless mouse |
it is not physically connected to the computer,but instead uses infrared or radio waves to communicate with the computer |
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what is a touch sensitive device? |
it is another way to input data and is specifically mounted screen that is sensitive to touch so ou do not need a mouse or keyboard |
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what is a touch pad? |
it is a flat rectangular surface which also senses movement of a finger on its surface |
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what is a light pen |
it is similar to a mouse but you can move it over the screen and point at items on the screen to input data |
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what does a scanner do |
it allows you to transfer pictures,graphics and text to your computer |
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how does the scanner work |
it scans the image from the top to the bottom one line at a time and transfers it to the computer. it can then take that copy and use it in point programs, send it out as a fax or print it |
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how do microphones work |
the computer responds to this data by carrying out instructions,such as printing a document to turning the spoken words into text in a ord processor |
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what are other names given to the microphone |
they are called voice-activated or voice recognition system |
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what do digitizers do |
these convert drawings and photographs into data for architects and makers of maps |
