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Q.

Two electric bulbs rated 25 W, 220 V and 100 W,220 V and connected in series across a 220 V voltage source. The 25 W and 100 W bulbs now draw P1 and P2 powers respectively(i)      P1=16W         (ii) P1=4W     (iii)    P2=16W        (iv)  P2=4W

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a

(i),(iv)

b

(ii),(iii)

c

(i),(iii)

d

(ii),(iv)

answer is A.

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Detailed Solution

⇒R1=220225=4R ⇒R2=2202100=R ⇒V1=4R4R+R×220=45×220V ⇒V2=220−V1=15×220V ⇒P1=V12R1=4/5222022202/25=16W ⇒P2=V22R2=1/5222022202/100=4W
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