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Class 7
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Physics
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Electric Current and its Effects
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Electric Bell
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Working of electric bell
Working of electric bell
5 Mins
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REVISE WITH CONCEPTS
How Electric Bell Works?
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Definitions
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QUICK SUMMARY WITH STORIES
Electric Bell
2 mins
Construction And Working Of An Electric Bell
2 mins
Important Questions
Explain the construction and working of electric bell with figure.
Medium
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In the circuit shown in figure, when the circuit is completed, the hammer strikes the gong. Which of the following force is responsible for the movement of hammer?
Medium
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Draw a neat and labelled diagram of an electric bell and describe its working.
Medium
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How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.
Medium
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An electric bell has an electromagnet.
Medium
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Read the extract given below and answer the question that follows:
The trees inside are moving out into the forest,
the forest that was empty all these days
where no bird could sit
no insect hide
no sun bury its feet in shadow
the forest that was empty all these nights
will be full of trees by morning.
The figure of speech used in these lines is _________ .
(i) Simile
(ii) Alliteration
(iii) Personification
(iv) Metonymy
Easy
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The hammer hits the gong in an electric bell because
Medium
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Why is soft iron used as the core of the electromagnet in an electric bell?
Medium
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The purpose of armature in an electric bell is
Medium
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An electric bell has a resistance of
5
Ω
and requires a current of
0
.
2
5
A
to work it. Assuming that the resistance of the bell wire is
1
Ω
per
1
5
m
and that the bell push is
9
0
m
distance from the bell. How many cells each of emf
1
.
4
V
and internal resistance
2
Ω
, will be required to work the circuit.
Medium
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>