this post was submitted on 03 Aug 2023
1179 points (98.7% liked)
Technology
59223 readers
3179 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
It’s an old riddle where a room has three lights and outside the room is the panel with three switches. They’re not labeled and you don’t know which switch controls which bulb. You’re allowed to switch any two, then you get to open the door and you have to determine which switches control which lights.
The solution is, that you flip switch #1, wait five minutes and then flip switch #2. Then you immediately go into the room.
Two lights will be on, meaning the bulb that’s off is the third switch. Then you feel the bulbs that are on: the one that’s warm already is the #1 and the other that’s on but still cool is #2.
LEDs don’t heat up like that so this technique is broken.
Mine heat up. Not hot, but definitely warm at the base. LED bulbs convert 25-50% of the electrical energy to light. The rest is heat. So a 9W LED bulb is a 4-6 watt heater.