hope u guys can help me to answer my question..why the resistance will decrease as the light intensity increase?

Question

kittiwitti1 · Answer

I don't know if I have the right idea (it's better to ask pros like @Kainui, @AllTehMaffs, @douglaswinslowcooper, @dan815 or @wolfe8), but I think that light intensity will only increase if the resistance decreases - or there won't be any room for the increase in intensity...

cybershadow · Answer

as the light intensity increases, the more Kinetic energy is supplied to the electrons and faster they move, that means current flows faster and lesser the resistance.

anonymous · Answer

@cybershadow... as convincing as your answer seems, it is actually HORRIBLY wrong :D

you are talking about semiconductors right? @ckco

cybershadow · Answer

lol thats what happens when u keep GAMING 24 x 7. I forgot intensity has nothing to with KE. and i mixed up photoelectric effect with all this Ugh lol

anonymous · Answer

haha. right :D.. but the suitable answer depends upon whether he is talking about photoelectric effect where we consider conductors or semiconductors..

cybershadow · Answer

ah yea, in conductors more the intensity , more no of electron will start moving and more the collisions ,so resistance will increase. And in semi-conductors there are lesser no of free electrons, so lesser the collisions and lesser the resistance.Correct me if i m wrong?

vincent-lyon.fr · Answer

"hope u guys can help me to answer my question..why the resistance will decrease as the light intensity increase?"

This question can only be answered if the context is clarified.
Please, always post FULL question on OS.

kainui · Answer

@Vincent-Lyon.Fr has the right idea here. I don't know what's being asked lol.

anonymous · Answer

I'm sorry if my question is hard to understand. now I'm doing a physics project titled the relationship between light intensity and resistance at LDR. for this project I made dark sensor circuit. when night falls, the lights will flash. I find that the reading of the LDR resistance is high while the light intensity is low. My question, can anyone explain to me how these things can happen. how the light can lighten up when resistance is high while the light intensity is low? i hope you all understand about the question that i'm trying to convey. ^_^..sorry again.. :(