M
Mark
- Jan 1, 1970
- 0
This is something I have benn curious about and I should probably know
but I don't so I have Googled but don't find anything...
I'm talking about an ordinary household lamp dimmer connected to an
ordinanary incandescent light bulb.
Starting with it all the way off, if you slowly turn it up, nothing
happens at first, then you get past the threshold and the bulb suddenly
comes on at say 25% brightness. Now you can turn it back down from
there to say 10% brightness. Why does the system exhibit this
threhold effect? In other words, you can't simply turn it up to 10%,
you have to first go up past the threshold and then back down.
Is it related to the resistance of the bulb changing?
Would the same thing happen with a constant resistance load?
Mark
but I don't so I have Googled but don't find anything...
I'm talking about an ordinary household lamp dimmer connected to an
ordinanary incandescent light bulb.
Starting with it all the way off, if you slowly turn it up, nothing
happens at first, then you get past the threshold and the bulb suddenly
comes on at say 25% brightness. Now you can turn it back down from
there to say 10% brightness. Why does the system exhibit this
threhold effect? In other words, you can't simply turn it up to 10%,
you have to first go up past the threshold and then back down.
Is it related to the resistance of the bulb changing?
Would the same thing happen with a constant resistance load?
Mark