KwickClips Networks and the Internet · 40 sec · free
Why must you point the remote at the TV?
Short answer. Infrared needs line of sight and cannot pass through walls.
Which wave passes through walls?
Radio waves.
Three wireless waves
| Wave | Travels | Example |
|---|---|---|
| Radio | All around | Mobile |
| Microwave | Straight line | Satellite |
| Infrared | Few metres | Remote |
Remember
| Radio passes walls |
| Infrared needs line of sight |
Why must you point a remote at the television? There are three waves. Radio spreads all around. Microwaves need a straight line. Infrared reaches a few metres. Remember. Radio passes walls. Infrared needs line of sight.
This clip is from the full lesson: Transmission Media: Wired and Wireless — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Computer Applications (165), CBSE Class 12 Computer Science (083), CBSE Class 12 Computer Science (083), CBSE Class 11 Information Technology (802)
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