Light bulbs

Electricity and Magnetism Level 2

Three similar light bulbs are connected to a constant-voltage d.c. supply as shown in the diagram. Each bulb operates at normal brightness and the ammeter (of negligible resistance) registers a study current. The filament of one bulb breaks. What happens to the ammeter reading and to the brightness of the remaining bulbs?

Ammeter reading vs Bulb brightness

Decrease\tand\t\tUnchanged Unchanged\tand\t\tUnchanged Increases\tand\t\tIncreases increases\tand\t\tUnchanged

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Shayaan Saghir by Shayaan Saghir , 25, Pakistan

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2 solutions

Nelson Mandela
Dec 31, 2014

As the bulbs are in parallel, when a bulb fuses, the net resistance increases. so, current decreases. Moreover, the brightness remains unchanged because they are connected in parallel. Correct me if I am wrong.

5 Helpful 0 Interesting 0 Brilliant 0 Confused

U would be right.... Because I did not know the answer....... Thanks for helping me...

Shayaan Saghir - 6 years, 5 months ago

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You made me laugh!

Muhammad Arifur Rahman - 6 years, 4 months ago

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In response to Arifur Rahman: How??

Shayaan Saghir - 6 years ago
Tan Chee Wen
Mar 10, 2015

V=IR. Net R increase, I decrease, ammeter reading decrease. Voltage drop across each bulb connected in parallel is the same. Same amount of current passing through each bulb. Power output remained unchanged.

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