Question

You are given four bulbs of 25 W, 40 W.
60 W and 100 W of power, all operating
at 230 V. Which of them has the lowest
resistance?
(A) 25 W . (C) 40 W
(C) 60 W (D) 100 W



i want the solution ​

Answer 1

Answer:

100 w

Explanation:

we know that

p=vi

=v²/r

thus,r=v²/p

so r is inversely proportional to p (if v² is constant).

so in this case,bulb with highest power will have lowest resistance.

hence,bulb of power 100 w will have lowest resistance.