Question

Q.6 Describe the construction and working of an electric bell with the help of diagram.

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Answer 1

Construction and wiring:

The main parts of the bell are:

A horse shoe electromagnet

A soft iron armature

A hammer

A gong

A metallic strip

An adjusting screw

A switch

A battery

The armature is fixed to the spring strip. The hammer is attached at the upper end of the armature. When the switch is not pressed, the strip makes contact with the adjusting screw and there is a gap in between the armature and the poles of the electromagnet.

The coil is wound on the two arms of the electromagnet in opposite directions. Tje two ends are connected to terminals. A battery is provided in series with the switch.

Working:

Wgen the electric circuit is closed by pressing the switch, the current flows through the coil and the core of the electromagnet gets magnetized and therefore it attracts the armature. Due to the movement of the armature, the hammer strikes the gong and the bell rings

Answer 2

◈ Electric Bell :- The electric bell is a simple device which is based on the magnetic effect of current.

$\\ \huge\red{\mathbb{CONSTRUCTION}}$

★ Electric bell consists the following parts :-

◈ A Gong.

◈ An electromagnet.

◈ A soft iron rod (Also called the armature)

◈ A contact screw.

◈ A hammer by which the gong starts ringing.

◈ A spring.

Note :- you can see many other parts of electric bell in the attachment.

_____________________

$\huge\blue{\mathbb{WORKING}}$

✭ When current flows through the electromagnet, the electromagnet acquires magnetism and attract the armature towards it.

✭ As the armature bands towards the electromagnet , the gong is struck.

✭ But at the same time contact between armature and contact screw got broken and the circuit it gets switched off.

✭ As the flowing current stops ( Due to the break in the circuit ) , the electromagnet immediately losses its magnetism.

✭ Therefore it no longer attracts the armature.

✭ The armature gets pulled back to its original position by spring action. it now again comes in contact with the contact screw ; the circuit gets completed again. The cycle repeats itself and the gong gets struck again.

✭ Due to these alternate making and breaking of the circuit, the electric bell goes on ringing continuously as long as the switch is kept pressed.