Question

Give one use of the electric bell.

Answer 1

Hint: Electric bells work as circuits. When the circuit closes, electricity flows through it. Current brings the electromagnets into play and it produces sound. It is used in many different areas. One of the most popular uses of an electric bell is in fire alarms where it either rings continuously or rings only once.

Complete answer:
An electric bell is a mechanical or electric instrument which functions with the help of an electromagnet. When current is applied, it produces a ringing, clanging or a buzzing sound. Electric bell consists of an iron bar with insulated wire coiled around it and an iron strip armature with a clapper.
An electromagnet is a type of magnet which produces a magnetic field when current passes through it.
In the electric bell, the iron bar acts as the electromagnet. So, when current flows through it, it gets converted to a magnet and attracts the armature towards it and the clapper strikes the bell producing sound.
Electric bells are widely used in Fire Alarms. There are two types of fire alarms; Vibrating alarm and single-stroke alarm. Vibrating alarms ring continuously as long as electricity flows through them. The single-stroke alarm rings once and then stops and will not ring until power is turned off and on again.
Therefore a use of an electric bell is the Fire Alarm.

Note:
Other uses of electric bells include use in telephones, doorbells, burglar alarms, at railway crossings etc. Electromagnets function as magnets only as long as electricity is flowing through them. They are usually made of an iron core or other magnetic materials with insulated wire coiled around it.