can anybody tell the project report on magnetic door bell???????
Answers
hey
here is your answer:-
'' It was a simple electric circuit containing a battery, a switch, and an electric motor standing on a large cardboard box. When a caller pressed the switch, the battery fed power to the motor and made it spin around with a buzzing noise (a bit like the vibrating alert on a cellphone or pager). Standing on the box, the motor made a reasonably audible but rather dull humming noise. Real electric doorbells aren't that different. Instead of using an electric motor and a cardboard box, they use an electromagnet (a temporary magnet whose magnetism can be turned on and off instantly by electricity) to make a more attractive sound, either with an electric bell, a buzzer, or chime bars struck by a magnetic hammer.Most doorbells have what's called a "push-to-make" switch outside your door, like the one in our top photo. When you prod the button, your finger pushes two electric contacts together to complete ("make") the circuit; when you release the pressure, a spring moves the button back out again so the circuit is interrupted. Like my own primitive doorbell, the circuit itself contains only two basic elements: a battery and something that makes a noise. The "something" is often an electric bell: a little metal bell (like one on a bicycle) and a clapper powered by an electromagnet. When someone presses the button, the electromagnet is activated and pulls on the clapper, which strikes the bell. But here's the clever bit: the clapper is actually also part of the circuit. When it flips out to strike the bell, it breaks the circuit at the same time, cutting the power to the electromagnet. A spring attached to the clapper pulls it back to its original position, whereupon it completes the circuit, energizes the electromagnet, and rings the bell once more. This goes on for as long as you keep the button pressed. Or until the batteries run out!''
in the first figure is about how does an electric bell works.
in the second figure it is the circuit of an electric bell.
and in the third figure it is the inside of an electric bell.
hope this answer is helpful to u
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