- #1
Ambidext
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Today in a lecture, prof asked that for 2 bulbs connected in series(100W and 40W), which was brighter? And the answer was the 40W bulb.
His explanation was that we use P = I2 R. Higher power rating means higher R, and thus less bright. I argued that since P = VI, and I is constant, P is directly proportional to V and thus the 100W bulb should be brighter. I could not really comprehend his explanations later on.
Also, for a parallel circuit, it was mentioned that a higher power rating bulb would be bighter instead.
Can someone here please enlighten me?
His explanation was that we use P = I2 R. Higher power rating means higher R, and thus less bright. I argued that since P = VI, and I is constant, P is directly proportional to V and thus the 100W bulb should be brighter. I could not really comprehend his explanations later on.
Also, for a parallel circuit, it was mentioned that a higher power rating bulb would be bighter instead.
Can someone here please enlighten me?