First slide

Electrical power

Question

A 100 W bulb B₁, and two 60 W bulbs B₂ and B₃, are connected to a 250 V source as shown in fig. Now
W₁,W₂, and W₃ are the output powers of the bulbs B₁,B₂ and B₃, respectively. Then

Moderate

A

$W_{1} > W_{2} = W_{3}$
B

$W_{1} > W_{2} > W_{3}$
C

$W_{1} < W_{2} = W_{3}$
D

$W_{1} < W_{2} < W_{3}$

Solution

It is obvious that voltage across B₃ is greatest and hence it glows brightest. In series connection, bulb of lesser wattage will glow brighter. HenceW₂ >W_1.So $W_{1} < W_{2} < W_{3}$

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