Question

Label the parts of the given electric bell.​ [4 marks]

Answer 1

Let’s label the parts P, Q, R and S.

• P is hammer
  It is a metallic hammer which strikes the gong to produce the sound in an electric bell. [1 mark]
• Q is contact screw
  It acts as a switch to break or complete a circuit. [1 mark]
• R is gong
  It is the part where the hammer strikes and the sound is produced. As the hammer strikes the gong, the circuit breaks. [1 mark]
• S is electromagnet
  The coil wrapped around a soft iron core behaves like a magnet when electric current flows through it. When the electric current is switched off, the coil generally loses its magnetism. These are called electromagnets. [1 mark]