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Q.

If a $60 W$ bulb and a $40 W$ bulb are connected to a source of $220 V$ potential in parallel, the bulbs glowing brighter is

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a

60 W

b

40 W

c

Both the bulbs glow equally bright

d

Cannot be found

answer is A.

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Detailed Solution

The

60 W

bulb will glow brighter than the

40 W

bulb when connected in parallel.
The rate at which an electric device converts electric current into another form of energy is known as electric power. So it can be measured as energy consumption per second.
Here electrical energy is converted into light energy.
For

P 60 W > P 40 W

i.e. Bulb

1

(

60 W

) is greater in power dissipation than bulb

2

(

40 W

). Therefore, the 60W bulb will consume more energy per second than the bulb

2

. The more energy consumption, the more electrical energy will be converted into light energy. So it will glow brighter than the

40 W

bulb when connected in parallel.

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