Question

When a 60W bulb is connected in series to a 40W bulb, Which bulb glows more brightly . Justify your answer​

Answer 1

Answer:

40 w bulb

Step-by-step explanation:

see if 60 w bulb will not get 60 w of electricity so it will not glow brighter whereas 40 w will gets half of the electricity therefore 60-30=30

and 40 w bulb need 40 w of electricity .

Answer 2

When two bulbs are connected in series, the current, I will be the same.

But the resistance varies. Higher the resistance, brighter the glowing.

$\bold{P = \frac{V {}^{2} }{R}⟹P,R are \: inversely}$

proportional to each other.

$\small\bold{Hence, P_{40}<P_{60} ⟹R_{40}>R_{60}}$

So, the resistance of 40W bulb is higher than the 60W bulb.

Hence, 40W bulb will glow brighter.