Advantages of using allotrpoes of carbon in resistors
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There are several allotropes of carbon.Allotropes of CarbonAllotropes of carbon: a) Diamond, b) Graphite, c) Lonsdaleite, d) C60 (Buckminsterfullerene or buckyball), e) C540, f) C70, g) Amorphous carbon, and h) single-walled carbon nanotube, or buckytube
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Carbon has several allotropes, or different forms in which it can exist. These allotropes include graphite and diamond, which have very different properties. Despite carbon's ability to make 4 bonds and its presence in many compounds, it is highly unreactive under normal conditions.Carbon composition resistors are suitable to withstand high energy pulses, while having a relatively small size. For this reason the carbon composition resistor is still used in many applications today. ... Carboncomposition resistors are applied in the equipment or the leads and have to withstand all pulse energy.
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Carbon composition resistors (CCR) are fixed form resistors. They are made out of fine carbon particles mixed with a binder (for example clay). After baking it has a solid form. Although carbon composition resistors are widely applied in circuits, the majority of resistors are nowadays made by deposition of a metal or carbon film over a ceramic carrier.
Advantages and disadvantages
The big advantage of carbon composition resistors is their ability to withstand high energy pulses. When current flows through the resistor, the entire carbon composition body conducts the energy. The wirewound resistor for example, has a much smaller volume of the wire to conduct. So the thermal mass of the carbon composition resistor is much higher, resulting in a higher energy capability. Carbon resistors can be made with a higher resistance than wirewound resistors, and are considerably cheaper. However, the properties are less good in terms of temperature coefficient, noise, voltage dependence and load.
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Advantages and disadvantages
The big advantage of carbon composition resistors is their ability to withstand high energy pulses. When current flows through the resistor, the entire carbon composition body conducts the energy. The wirewound resistor for example, has a much smaller volume of the wire to conduct. So the thermal mass of the carbon composition resistor is much higher, resulting in a higher energy capability. Carbon resistors can be made with a higher resistance than wirewound resistors, and are considerably cheaper. However, the properties are less good in terms of temperature coefficient, noise, voltage dependence and load.
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