What is the function of contact screw in a bell

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Contact screw completes the circuit in an electric bell. 
When the iron strip is in contact with screw,the current flows through the coil and it becomes an electromagnet. The hammer at one end of iron strip strikes the gong and bell is rung.

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WHEN THE SWITCH IS PUSHED THE CURRENT PASSES THROUGH THE COIL AND THE HAMMER STRIKES THE GONG,
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