Question

how does this electric bell works ?
http://www.google.com.au/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&docid=iJCvzL8Fotg7gM&tbnid=wP3fq05OqpP6iM:&ved=0CAUQjRw&url=http%3A%2F%2Fwww.controlcircuitdiagram.com%2Fschematicelectrical.com%2F2010%2F12%2F03%2Fcircuit-diagram-of-electric-bell%2F&ei=FlN4U46jNpfd8AWUvoKoCg&bvm=bv.66917471,d.dGc&psig=AFQjCNFSM6ccVjhlFchdSOPlF5danLZVjQ&ust=1400480883527482

Answer 1

An electric bell works when an electrical current flows through an electromagnetic coil. when an eclectic current passes through a coil, a magnetic fileld produces..

As you see, there is an iron core inside the coil. this iron becomes megnetized. and act as an electromagnet. when current passing through the coil, this core remains magnetized and act as magnet.

This causes a strip of iron inside the bell to be attracted to the electromagnet and when it is, it strikes the side of the bell housing.
http://en.wikipedia.org/wiki/File:Electric_Bell_animation.gif


In this animation a strip Name "A" is attracted by the iron core which is acting as a magnet.... when core attracts the strip, this other end of the strip touched the "B". and bell starts ringing....