Electronics/question regarding Ohms Law.
Hello Sir, I have already asked you this question but I am confused in your explanation that you gave last time. Please help me one more time in this question.
A 60 W bulb and a 100 W bulb are connected in series. Which of
them will glow more brightly when a constant pd is applied
across the circuit ?
No more values and clues are given in this question. What I did in solving this problem is I used a general formula: P = I^2 * R . In series, we have constant I for both bulbs, so P is directly proportional to R. So, 100 W bulb will have more R and hence glows more brightly. But, in your last email you told me that 60 W bulb will have high R. How is it possible ?
No, P is proportional to I**2 isn't it? More R means it would have less current when connected to the same voltage - which is where the bulb rating comes from. Remember, the rating of the bulb is computed with the standard voltage across it; not from that which it will have across it when in series with the other one!
E = I*r100 + I*r60
Just looking at the logic of the bulb ratings; if one bulb dissipates 100w then it must have a lower resistance than the 60w bulb.