Which of the following is a major application of carbon in electrical engineering?

Carbon is a versatile element that has numerous applications in various fields, including electrical engineering. One of the major applications of carbon in electrical engineering is its use in electrical contacts and brushes in motors. 

Additional Information

Electrical Contacts and Brushes in Motors

Carbon brushes are essential components in electric motors and generators. They serve as a medium for conducting electricity between stationary and rotating parts of the machine. The use of carbon for brushes offers several advantages:

• Good Electrical Conductivity: Carbon has excellent electrical conductivity, which ensures efficient transfer of electrical current between the rotating and stationary parts.
• Lubrication Properties: Carbon brushes provide self-lubrication, which reduces friction and wear between the brush and the commutator. This property enhances the lifespan of the brushes and the motor itself.
• Heat Resistance: Carbon can withstand high temperatures without significant degradation. This is crucial because electrical contacts and brushes in motors are subjected to continuous friction and heat generation.
• Low Coefficient of Thermal Expansion: Carbon's low thermal expansion ensures that the brushes maintain their shape and performance even under varying temperature conditions.
• Mechanical Strength: Carbon brushes possess adequate mechanical strength to endure the pressures and forces exerted during operation.

Due to these properties, carbon brushes are widely used in various types of motors, including DC motors, synchronous motors, and induction motors. Their ability to provide reliable electrical contact and withstand harsh operating conditions makes them indispensable in the field of electrical engineering.