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)
More KwickClips from this lesson
What does a keyboard send?39 sec
Which device gives sound?37 sec
Who gives input to an automatic door?39 secVoice-over is AI-generated; the script is written and checked by Kajal Ma'am. Confirm anything you plan around against your official board document. We never ask for a password or an OTP.