Conducting Material

Electrical Carbon Properties

Fig:- Electrical Motor with Carbon Brushes

  • This material is made from graphite and other form of carbon.
  • Conductivity of Carbon is less than Copper (Cu) and Aluminum (Al) but its surface is smoother so it is used to make brushes in a Electrical Machine.
  • Carbon brushes are graphited or heat treated to increase conductivity and reduce hardness.
  • Graphite has negative temperature coefficient

R=Ro(1-αΔT) as Temperature increases Resistance decreases

Brush drop Voltage (VBD=IR=Constant)


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