How does an electric bell work using electromagnets?
Electromagnets have a wide range of uses in all sorts of devices. Can you think of some devices from everyday life where we use electromagnets? Electromagnets are used in cranes to pick up cars in scrapyards and also to separate iron from garbage dump. They are also used in loudspeakers, telephones, and in electric motors which are used in electric fans, washing machines, refrigerators, etc. Electromagnets are also used in electric bell.
What do you do when you reach your friend’s house to let him/her know that you are at the door? You ring the doorbell. Do you know what makes the bell ring? An electric bell has an electromagnet that pulls a strip of iron which makes the hammer hit the gong to ring the bell.
Step 1: When you push the switch of the bell, an electric current flows to the electromagnet [Fig. (a)].
Step 2: The electromagnet attracts the soft iron strip. The hammer attached to the strip then hits the gong, making it ring [Fig. (b)].
Step 3: When the soft iron strip gets attracted to the electromagnet, it no longer touches the screw (interrupter) and hence the circuit is broken (much like a switch being turned off). This turns off the electromagnet
and it can no longer attract the soft iron strip. The soft iron strip returns to its initial position, touching the screw (interrupter). This results in the circuit being complete, and current flows again [Fig. (c)].
Steps 1 to 3 repeat in quick succession as long as the switch is on. This is how we hear a continuous ring of the bell.
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