Electric Bell

 Electric Bell is a electromechanical equipment which works on the basis of electromagnetism. It consists of a coil wound on soft iron core, a striker, a switch and a gong(Bell) as shown in fig below.

Process of the working of an electric bell
Now that we have an understanding of the important parts in an electric bell, the step-by-step process of the working of the electric bell is described below:

• The switch is pressed and current flows through the circuit.
• The electromagnet is powered and generates a magnetic field that attracts the iron strip towards it.
• The striker strikes the gong (bell).
• When the striking arm strikes the gong, the contact is broken and current stops flowing through the circuit.
• This causes the electromagnet to lose its magnetic field.
• The connected spring arm returns the striker to its original rest position.
• The contact is restored and current flows through the circuit (provided the main switch is still pressed).
• The process is repeated from the beginning.