Question

There are two electric bulbs a)marked 60W,220V b) marked 100W,200V. Which one of the two has a higher resistance ?

Answer 1

P=V^2/R
So,
1st Case,
60=48400/R
so, R=4840/6
and in 2nd case it is 4840/10

So, it is clear that resistance will be more in case 1..

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