working of an electric bell
Answers
An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. ... When an electric current flows through the coils, the electromagnet creates a magnetic field which pulls the armature towards it, causing the hammer to strike the bell.
Answer :-
An electric bell is one of the most common appliances of an electromagnet. We can think of an electric bell as a device that has two switches connected in the electromagnet's circuit. The first switch is outside the bell. The second switch is inside the bell, and consists of the parts S and T. When the outer switch is pushed, current flows through the electromagnet inside the bell. This causes the electromagnet to pull the springy iron strip S. As soon as the strip moves towards the electromagnet, its contact with the terminal T is lost. This breaks the circuit inside the bell. So, the electromagnet stops attracting the iron strip. The strip returns to its original position and makes contact with T. This closes the circuit, and the electromagnet attracts the strip once again. This clever arrangement causes the strip to move back and forth many times a second. As the iron strip moves, the hammer H fixed to it strikes the gong G. This produces the sound of a bell.
This is how the electric bell which is located at our school works after a class is over.