Question

100 W bulb work on 230 V supply.
a) if voltage is halved, how much will be the power​

Answer 1

Answer:

25 watt

Explanation:

$w = {v}^{2} \div r$

v' = v/2

so

w'=w/4

= 25 watt

coz the

w is proportional to the v^2