- Carbon Definition: Carbon is defined as a versatile element used in various electrical engineering applications due to its unique properties.
- Carbon Filament in Incandescent Lamps: Carbon is used for making filaments in incandescent lamps because of its high resistivity and melting point.
- Carbon Electrical Contacts: Carbon fibers enhance the mechanical strength and reduce wear of electrical contacts under load.
- Carbon Resistors: Carbon’s properties make it suitable for resistors used in electronic circuits.
- Carbon Uses in Electrical Engineering: Carbon’s applications include filaments, contacts, resistors, brushes, electrodes, and components in various electrical devices.
Carbon, in different forms and combined with other materials, is widely used in electrical engineering. Electrical carbon materials are made from graphite and other types of carbon.
Carbon is having following applications in Electrical Engineering–
- For making filament of incandescent lamp
- For making electrical contacts
- For making resistors
- For making brushes for electrical machines such as DC machines, alternators.
- For making battery cell elements
- For making carbon electrodes for electric furnaces
- Arc lighting and welding electrodes
- For making component for vacuum valves and tubes
- For makings parts for telecommunication equipment.
Carbon Use for Making Filament of Incandescent Lamp
Carbon is used with an inert gas to make filaments for incandescent lamp. Its resistivity is about 1000-7000 µΩ-cm, and its melting point is around 3500°C, making it suitable for this use. The efficiency of carbon filament lamps is 4.5 lumens per watt or 3.5 watts per candle power. To prevent blackening of the bulb, the working temperature is kept below 1800°C.
Carbon Use for Making Electrical Contacts
Carbon fibers, made from polymers by pyrolysis, have high mechanical strength under tensile load. These fibers strengthen electrical contacts, reducing wear and tear during operation. As a conductor, carbon also helps reduce contact resistance.
Carbon Use for Making Resistors
Carbon’s high resistivity, high melting point, and low temperature coefficient of resistance make it ideal for resistors. These carbon resistors are widely used in electronic circuits.
Carbon Use for Making Brushes for Electrical DC Machines and Alternators
Graphite Carbon is very much suitable for making brushes for large rating DC machines and alternators. Brushes made graphite carbon are having following advantages –
- Graphite Carbon brushes are having high contact resistance. This high resistance of graphite carbon brushes helps to improve commutation.
- High thermal stability – which make them suitable to withstands at high temperature developed due friction during operation of rotating machine.
- Self-lubrication between stationary brushes and rotating commutator or slip rings. Which reduces the wear and tear of commutator or slip rings.
Carbon Use for Making Dry Cell Elements
Carbon is an important element of construction of dry cells. Carbon is used for making electrodes for zinc-carbon batteries (Dry cells). Carbon electrode works as positive pole of battery. In dry cells the carbon is an inert material as it does not take part in electro-chemical reaction occurring in dry cells.
Carbon Electrodes Use for Electric Furnaces
Graphite carbon is widely used for manufacturing the electrodes for Electric Arc furnaces. In Electric Arc furnaces used for steel production the operating temperature level is about 2760oC. Graphite carbon is only commercial available material which has the high level of electrical conductivity and ability to with stand with such high level of temperature. Which make it suitable for making electrodes for electric arc furnaces.
Graphite Carbon Use for Arc Lighting and Welding Electrodes
Graphite carbon is also widely used for manufacturing the electrodes for Arc lighting and welding. As discussed above, graphite carbon has the high level of electrical conductivity and ability to with stand at high level of temperature during Arc lighting and welding. Which make it suitable for making electrodes for Arc lighting and welding.
Carbon use as Component of Vacuum Valves and Tubes
In vacuum valves and tubes, carbon is used for coating of cathode and grid to protect against mechanical deformation produced at very high temperature produced during operation of vacuum vales and tubes. In high power application, the anode used in vacuum valves and tube, must be capable to withstand at high operating temperature and must be capable to dissipate the heat produced. For this purpose carbon is very much suitable for making anodes for vacuum valves and tubes.
Carbon use for Makings Parts for Telecommunication Equipments
Carbon is used for making transducers such as microphones which converts the sound to electrical signal. Before development of vacuum tube based amplifiers, the carbon-microphones were the only practical means for obtaining high level audio signals.
