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10 Cards in this Set
- Front
- Back
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Signs of virus infection
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Unusual message or images is displayed on the computer screen
Unusual sounds or music plays randomly The available memory is less than what should be a available A program file aids sly is missing An unknown program or file mysteriously appear The side of file changes without explanation A file becomes corrupted A program or file does not work properly The computer operate much slower than usual |
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Input
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Data & instruction on enter a into memory of a computer. Programs -> commands -> user respond.
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Biometric devices /input
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Technology of authenticating a personality by verifying a personal characteristic.
Translates a personal characteristic into digital code Compared with a digital code stored in the computer Fingerprint reader Face recognition system Hand geometry system Voice verification system Signal verification system Iris recognition system Retina scanner |
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Application in our daily life
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Automated teller machines
DVD kiosks Pos / point of sale terminal |
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Printer
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A output device that produce text and graphics on a physical medium such as paper.
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Non impact printer
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Forms characters and graphics on a piece of paper without actually striking the paper.
Ink jet printer Photo pointer Label and postage printer |
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Ink jet printer
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Forms character and graphics by spraying tiny drops of liquid ink into a piece of paper
A dot as a drop of ink Higher dpi means the drops of ink are smaller 1200-4800 dpi. |
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Impact printer
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Forms character and graphics on a piece of paper by striking a mechanism against ink ribbon physically contacts the paper.
Dot Matrix printer Line printer |
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Dot matrix printer and line printer
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Are ideal for printing multipart forms because they easily print through many layers of paper
Withstand dustily environment Continuous form paper |
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How an ink jet printer work?
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1st step - a small resistor heat the ink, causing the ink to boil and form a vapor bubble
2nd step - the vapor bubble forces the ink through the nozzle 3rd step - the ink drops onto paper 4th step - as the vapor bubble collapses fresh ink is drawn into the firing chamber |
