A chime doorbell uses a specialized sort of electromagnet called a solenoid. A solenoid is just an electromagnet where the coiled wire surrounds a metal piston. The piston contains magnetically conductive metal, so it can be moved backward or forward by the electromagnetic field.
Reference:
http://home.howstuffworks.com/doorbell3.htm
it is like a door bell
Gandeton
Tagalog translation of door bell: batingaw ng pinto
A electromagnetic bell works by a electrical circuit.
are nyc landlords required to provide and install front door bell
=== === the answer is 1831
door bell
A door bell
That's what the front door is for; for visitors. No 'decision' for permission is required. Your door-bell and your knocker is the invitation; even for strangers. Even if there's neither a door-bell or a knocker, anyone can come to your front door and knock. Even the police can come to your door, and have to knock or ring the bell to present you with a search warrant; or with a summons.
One can purchase a door bell on an online marketplace selling these specific kinds of bells. One could also visit one's nearest door retailer for purchasing different kinds of door bells.
Because it is excited to see who is there :D
i am not sure why it does that but on the 97 it is the opposite it is simply a glitch in the wireing nothing to really worry about My 97 did the same thing except it the bell worked on all the other doors except the driver door so my cousin took the little button sensor off the back door and rewired it to the front door and now it works like its supposed to.. he said that the driver one just got wore out.