Why are carbon brushes used? How does this work? In order to find answers to such questions, visit a nearby workshop and try to understand the construction of an electric motor.

Carbon brushes are commonly used in electric motors and generators to transfer electrical current between the stationary parts (stator) and the rotating parts (rotor) of the machine. They play a crucial role in providing a continuous electrical connection and ensuring smooth operation.

The primary function of carbon brushes is to conduct electric current between the stationary parts and the rotating parts. In an electric motor, the stator typically consists of a series of wire coils that create a magnetic field when an electric current passes through them. The rotor, on the other hand, is a rotating component that houses the armature or permanent magnets. As the rotor spins, the carbon brushes make contact with the spinning commutator or slip rings, which are attached to the rotor, allowing electrical current to flow.

The carbon brushes are made from a mixture of carbon and other conductive materials, which are chosen for their ability to handle high current and resist wear. Carbon is an excellent choice due to its good electrical conductivity, low friction properties, and resistance to heat. The brushes are typically held in place by brush holders, which are mounted on the stationary part of the motor.

When the motor is powered, the carbon brushes make contact with the commutator or slip rings, establishing an electrical connection. As the rotor rotates, the brushes slide along the commutator or slip rings, maintaining the connection and transferring the electrical current. The carbon brushes also help to dissipate the heat generated by the electrical current, preventing excessive heating and damage to the motor.

Over time, the carbon brushes can wear down due to friction and electrical arcing. When this happens, they need to be replaced to ensure proper functioning of the motor. Regular maintenance and inspection of the brushes are necessary to ensure their effectiveness and prevent motor malfunction.

Visiting a nearby workshop can provide a hands-on experience and visual demonstration of the construction and functioning of an electric motor, including the use of carbon brushes. It would be a great opportunity to observe the various components, understand their roles, and ask specific questions to enhance your understanding.