How long does the average light bulb take too turn off after you flick the switch?

Question

How long does the average light bulb take too turn off after you flick the switch?

Answer 1

the speed of an electron and since iv dropped science i dont need to know tht answer anymore

Answer 2

An appreciable amount of time, IF it is a tungsten filament type. The filament is heated to 2700 degrees C and will take some time to cool down. However, it will cease emitting visible light when it cools to below 800 degrees C.

Answer 3

.36 of a second.

Answer 4

That is probably more of a statistics problem. what IS an average light bulb? and exactly what do you mean by "off"?

The brightness of an incandescent lamp falls rapidly at first when the current is interrupted, but it can glow red for a fair fraction of a second or even seconds for a large lamp.

I haven't seen a Mythbusters episode about this so I don't know what they found or even if one exists, but around a third of a second does sound reasonable.

[EDIT] I found the MythBusters episode on Google video, and they were talking about the turn ON time with the 0.36 seconds, not the turn OFF time. Still, the visible light will probably be gone in considerably less than a second.

You don't say why you wand to know, but for very sensitive applications, florescent lights cam produce a very dim glow for minutes, this is rarely an issue (or even visible unless ones eyes are well dark adapted) , but if developing high speed photographic film it might be something to consider.

Answer 5

A little bit longer than the light being there when you switch it on, this is based on the speed of light and the distance from the light to to switch, mind you this could all be bulls*** as i am not a clever guy.

Answer 6

The next time you turn off a light.

Close your eyes flip the switch.open eyes..

you will see a delay.

the real question is where did it go?  LOL!

Micro seconds for sure!

Answer 7

An ordinary incandescent light bulb starts to cool once it is switched off. The filament has cooled to the point where very little light is given off after about 100ms.

The temperature does fluctuate measurably at 120Hz, so in 6ms the temperatrue has dropped slightly, but measurably. It depends on exactly hopw cool you want it before you count it as "off".

Answer 8

about a microsecond.    There are superconductor switches that can turn off and on up to 10,000 times per second!

Answer 9

LESS THAN THE BLINK OF AN EYE!

Answer 10

the filament is heated until it emits light.

the flow of electrons discontinue as soon as the switch is turned off.

therefore the time is 0 seconds.

Answer 11

Switches, circuit breakers and most fuses require the sine wave to cross zero before current stops flowing.  Zero crossings occur every 1/120th of a second for a 60 Hz ac electric system.

0.0083 seconds is ½ of one cycle.

8.3 milliseconds