Скачать или смотреть How to Make Electric Bell from Recyclable Objects at home | DIY

An electric bell is a device that converts electrical energy into kinetic energy and then into sound energy. An electric bell has an electromagnet in front of which an iron armature is adjusted. Its one end is fixed, while the other end is connected with a hammer which is moveable. Nearby the hammer, a gong is placed in such a way that the hammer can beat on the gong. When the switch is turned on, the electromagnet attracts the armature. Due to this, the hammer strikes the gong and the bell rings. As soon as the armature is pulled by the electromagnet, current in the circuit is automatically switched off. In this situation, the electromagnet loses its magnetism and it won't attract the armature thus armature returns to its original position. The circuit is now completed and current flows in the circuit. The cycle is repeated again and again to ring the bell till the switch is on. Here's a video showing you how to make an electric bell.

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