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Some electric bulbs are connected in series across a 220V supply in a room.  If one bulb is fused, then remaining bulbs are connected again in series across the same supply.  The illumination in the room will be

a)

Increase

b)

Decrease

c)

Remain the same

d)

Not continuous



Question ID - 151375 | SaraNextGen Top Answer

Some electric bulbs are connected in series across a 220V supply in a room.  If one bulb is fused, then remaining bulbs are connected again in series across the same supply.  The illumination in the room will be

a)

Increase

b)

Decrease

c)

Remain the same

d)

Not continuous

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

From Joule’s law, the heat produced is given by

Where is potential and  the resistance.

When one bulb is fused, the total resistance of the circuit decreases.  Hence,  illumination increases.

127 votes


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