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 to a supply of 220 V?

Question

Philoid · Accepted Answer

We know that,

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

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