Question

Out of the following bulbs rated 40 W, 220 V,

60 W, 220 V and 100 W, 220 V which one will

glow the brightest

when connected in series in series to a supply of

220 V ? ​

Answer 1

Answer:

100 w bulb will glow the brightest

Answer 2

We now that,

P = V2RV2R

R = V2PV2P

Now, as all the bulbs are given the same voltage so resistance of the 40W bulb is the greatest.

As the bulbs are connected in series so the current through the bulbs are the same

P = i2R

So the power if the 40W bulb is the greatest and the power dissipated gives the glow of the bulb