What is the function of the contact screw in the working of electric door bell?
Dear Student ,
When the iron strip is in contact with the screw then the electric current flows through the coil and makes it an electromagnet .
This is the main function of contact screw .
Regards
When the iron strip is in contact with the screw then the electric current flows through the coil and makes it an electromagnet .
This is the main function of contact screw .
Regards