Electromagnets in Doorbell

The Electromagnetics of Doorbells

Doorbells

Doorbells are usually used in the front and back of buildings in order to request entrance and often get entry into the building. They were created in 1831 and have been used in common households ever since the 1900s so they are not a particularly complicated and fancy invention. They are a pretty simple and a seemingly boring invention, you click a button that completes a circuit to trigger a sound to play throughout the building. 

Electromagnetics behind the Doorbell

How doorbells work is that at the center of it all is the electromagnet. Electromagnets are coils of metal that are wrapped around a small piece of magnetic metal. Electricity then passes through it,  creating a magnetic field around the wire. When you ring a doorbell, an electrical current is completed which lets the household electricity go through the doorbells internal electromagnet. The magnetic field that is generated by the electromagnet and then is used to power a mechanism in order to make the doorbell sound. Doorbells require very little energy, which is because of one of the most important parts of the mechanism, the transformer. The transformer is used to transfer the usual 120V household current down to around 6-16V that the doorbell is required. This helps lower the total current circulating making it safer in the house.