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ICSE Class 7 Physics Question 31 of 36

Electricity and Magnetism — Question 31

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Question 31

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer.

The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer. Electricity and Magnetism, Concise Physics Solutions ICSE Class 7.
The following diagram shows four circuits A, B, C and D. Each circuit has a cell and a torch bulb. Name the circuits in which the bulb will glow? Give reason to your answer. Electricity and Magnetism, Concise Physics Solutions ICSE Class 7.
Answer

The bulb will glow in circuit A as both the wires i.e. copper and aluminium are good conductors of electricity. But in other circuits B, C and D silk, cotton etc. are used which are insulators i.e. they do not allow the flow of electricity through them. So bulbs do not glow in circuits B, C and D.