Question

Describe the working of a door bell.
Any one can plz tell me the answer.
It's much urgent.
plz .​

Answer 1

$\huge\mathcal\red{ANSWER}$

The heart of a doorbell is an electromagnet. ... When you press a doorbell button, you complete an electrical circuit that allows household electricity to flow through the doorbell's internal electromagnet. The magnetic field generated by the electromagnet is then used to power a mechanism that creates the doorbell sound.