Buzzers and bells and alarms
An electric bell is among the most common electrical equipments found in every house or office. It is used as a door bell, phone ring, fire alarm and can be found in many different shapes and sizes. An electric bell is a simple example of how we can use electromagnets to convert electrical energy to mechanical energy and sound waves. The same mechanism used to vibrate a hammer in an electric bell, is used in many other industrial and household equipments. Two well known examples are Electric Shavers and Shearing machines.

 These two both work like a buzzer, but instead of an iron arm, a blade will be vibrated. In this project you will make a bell or a buzzer to demonstrate the vibrating motion produced using an electromagnet. You will also study factors affecting the strength of your electromagnet.

 Project description:
In this project you will use iron nails and wires to make a few electromagnets and test their strengths. You will also make a working model of a buzzer or an electric bell using the material that can be found at home or obtained locally.
 Details of this project
More details or support on this project is available for the members of Material needed for experiment or a science kit about this title may be available at