Question

3 bulb of 40w, 60w and 100w are connected in series across 220v ac source which bulb will glow brighter

Answer 1

bulb of 100w will grow brighter as its power is higher than other

Answer 2

By

R=v^2/p. Where p= power ;

R=resistance;

V=voltage

Resistance is inversly proportional to power

Since p1<p2<p3 hence R1>R2>R3

and since current in a circuit is inversly prop. To resistance.

Hence i1<i2<i3