Does a Light Bulb Last Longer When You Switch it On and Off, or Keep it Burning?

Does a light bulb last longer when you switch it on and off, or keep it burning?

Hey guys!

It's your boy here again with something you might really need to know. Okay, keep on reading...

Electric light bulbs with filaments give out light because the electricity running through the bulb causes its filament to heat up and glow. The filament is thread-like wire inside the bulb. It does not burn out immediately because there is no oxygen within within the bulb to allow it burn, and oxygen is needed to make things burn.

Switch light on- the sudden rise in temperature expands, or stretches, the filament. Switch a light off- the filament contracts, or shrinks. A metal that is always being expanded and contracted will eventually break. The molecules of filament "get tired" of the exercise, just as you get tired after lots of excercise, for your muscles stretch and contract too.

Picture two rooms, each with a white bulb. Imagine that you leave one light burning for a certain amount of time, and flick the other one on and off during the same period of time. If you did this experiment, you would fine that the bulb that was switched would burn out first, even though it wasn't on constantly, because it's filament was strained.

Another problem with a light bulb can happen if you change it's position, or simply take it from its socket to clean it. When you do this, the chances are that the bulb will burn out soon. This happened because the filament has been strained. It is brittle and fragile and should not be moved.

So be careful with your electric light bulbs. Only use them when necessary, and don't flick them on and off. 

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