Pune Carbon Pvt. Ltd.

  
 
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Electrical Contact

A switch has two pieces of metal called contacts that touch to make a circuit, and separate to break the circuit. Carbon is chosen for its resistance to corrosion, because most other metals form insulating oxides that would prevent the switch from working. Carbon is also chosen on the basis of electrical conductivity, hardness (resistance to abrasive wear) and mechanical strength, low cost and low toxicity.

 

A relay is an electrically operated switch. Relays are used to and for:

  • in some types of modems or audio amplifiers,
  • in the starter solenoid of an automobile,
  • Circuit breakers (protection relays)
  • Room occupancy detectors in an effort to conserve energy
  • Logic functions
  • Time delay functions
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