IIT JEE , AIEEE Forum - Physics , Electricity - ha ha ha get screwed up.current supplied to our homes is ac

sinha0109

so why does the bulb does not blink rapidly. give two answers.

ultimator

The reason is due to high frequency of ac.

First, its a heating process. So when current passes in one direction, it gets heated up. So it emits light. Before , it starts cooling to a low temp , current passes again, in the other direction, thereby heating it again.

Second, we wud not b able to notice such a rapid change due to the high freq. Our eye can only differentiate movements seperated by atleast 1/16 of a second. This is called continuity of vision or some thin. Forgot.... : ) (U cant differentiate btwn the blades of a fan rotatin at high speed)

So actually , the bulb mite be blinking rapidly but v r not able to notice it.

I hope these r the answers.

ashish_banga

persistence of our vision is not such high such that we can see the bkinking

mukulss

the question puteer must be satisfied by now...........

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