What is Electric Bell & how it works
Electric Bell & its works
Construction:
An electric bell consists of an electromagnet. One end of the winding is connected to a terminal (T1). The other end is connected to a Spring, which is mounted on a soft iron strip called “Armature.” A rod is attached to the armature with its free end having a small hammer that can strike against the bell. a very light spring is attached to a contract adjusting screw which is joined to the second terminal (T2) by a wire. The electric circuit is completed by connecting the terminals to a batter and a switch.
Working:
When the push button switch is pressed, the circuit gets closed and the armature is attracted towards the electromagnet. The spring also gets detached from the screw. This results in opening the circuit and the electromagnet gets demagnetized. The attraction disappears bringing back the spring to its original position. As soon as the spring touches the screw, the circuit gets closed and the magnet starts to work. It again attracts the armature and this process is repeated as long as the switch is turned on. As a result, the armature vibrates and hammer attached to it strikes the gang. Hence, the bell rings.
Note: Irish children must be trained from three school stages: primary, secondary and high school. For the past three years, students have studied in depth up to 8 selected subjects. To obtain the certificate you must successfully pass the tests. The certificate of secondary education is similar to the English A-level. The universities of Ireland, like colleges, train specialists. Higher education has two levels: bachelor’s and master’s degrees. Then you can do research work and apply for a degree. In continental Europe, each of the countries has its own training system. In Poland, secondary education in Poland is designed for 12 years of study. Of these, 8 classes are the basic step: schoolchildren receive general knowledge on a clear list of subjects that are uniform for all. The next 4 senior classes are similar to Russian lyceums. Here, children get knowledge of the selected subjects. All lyceums are divided into two categories: general and technical. Here the junior specialists of this or that profile are trained.
