Question

Answer the above questions !!​

Answer 1

Answer:

B

Explanation:

B) 25 W bulb fuses

B is the right answer

Answer 2

QUESTION:

Two electric bulbs rated 25W-220V and 100W-220V are connected in series to a 440V supply. Which of the bulbs will fuse?

ANSWER:

• 25 W bulb will fuse.

GIVEN:

• Two electric bulbs rated 25W-220V and 100W-220V are connected in series to a 440V supply

EXPLANATION:

As the bulbs are in series voltage will be different.

$\bigstar\boxed{\bold{\large{\red{P = \dfrac{V^2}{R}}}}} \\ \\ \\ \leadsto\sf R_1 = \dfrac{V^2}{P_1} \implies\dfrac{(220)^2}{25} \\ \\ \\ \leadsto \sf R_2 = \dfrac{V^2}{P_2} \implies\dfrac{(220)^2}{100} \\ \\ \\ \leadsto \sf \frac{R_1}{ R_2 } = \dfrac{\dfrac{(220)^2}{25}}{\dfrac{(220)^2}{100}}\\ \\ \\ \leadsto \sf \frac{R_1}{ R_2 } = \dfrac{100}{25} \\ \\ \\ \leadsto \sf \frac{R_1}{ R_2 } = 4\\ \\ \\ \sf \pink{ As \ V \propto R, \ Voltage \ will \ also \ be \ shared\ in\ the} \\ \sf\pink {ratio \ of \ 4 : 1.} \\ \\ \\ \leadsto \sf 5x = 440 \\ \\ \\ \leadsto \sf x = 88 \\ \\ \\ \leadsto \sf 4x = 352 \ and \ x = 88$

Voltage in 25 W bulb will be 352 V which is more than 220 V which will make it to fuse.