KwickClips Computer Systems · 42 sec · free
Where does the price come from?
Short answer. The computer looks it up in its database.
Which holds more data?
The QR code, because it stores data in two directions.
Readers and touch
| Device | Gives |
|---|---|
| Barcode | product code |
| QR code | link or UPI ID |
| Touch screen | in and out |
Remember
| Barcode: product code |
| Touch screen: both ways |
Does a barcode store the price? No. Let us see. A barcode gives a code; the price is looked up. A QR code holds links or payment details. A touch screen does input and output. A barcode is only a code. A touch screen works both ways.
This clip is from the full lesson: Input Devices — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Computer Applications (165), CBSE Class 9 Computer Applications (165), CBSE Class 9 Information Technology (402), CBSE Class 9 Information Technology (402)
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Who gives input to an automatic door?39 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy