Question

describe the construction and working of an electric bell with the help of a diagram

Answer 1

An electric bell consists of an iron core, on which is wound a wire as a coil. One end of the coil is connected to one terminal of a battery, and the other end to a steel rod that acts like a spring for the hammer touching the screw contact. The other terminal of the battery is connected to the screw contact with a switch in the middle. Working of an electric bell Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the

Answer. Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.

Answer 2

Explanation:

◈ 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.

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

✭ 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.