Mesothelioma symptoms common in the early stages are: 1  Shortness of breath (dyspnea) 2  Chest pain. 3  Persistent coughing.  Pleural effusions (fluid 1  buildup) Fever. 2  Fatigue. Weight 3  loss. Body  aches.
Noun. 1. electromagnet-a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet. armature-coil in which voltage is induced by motion through a magnetic field. electric bell-a bell activated by the magnetic effect of an electric current.
How Doorbells Work. The core of a conventional doorbell is an electromagnet. If you've read How Electromagnets Work, you know that an electromagnet is a coil of wire, often wrapped around a piece of magnetic metal. Electromagnets work on a very simple principle. Running electrical current through wire creates a very small magnetic field around the wire.