why carbon brushes are used in the manufacturing of ac Dynamo?
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There are a number of reasons, including:
1. Carbon is self-lubricating.
2. Carbon has a negative temperature coefficient of resistance, which means that its resistance falls as its temperature increases -which is opposite that of metals such as copper.
3. Carbon is softer than copper, so will not damage the commutator.
4. Carbon will acquire the shape of the commutator segments and, so, will ensure maximum contact with them.
1. Carbon is self-lubricating.
2. Carbon has a negative temperature coefficient of resistance, which means that its resistance falls as its temperature increases -which is opposite that of metals such as copper.
3. Carbon is softer than copper, so will not damage the commutator.
4. Carbon will acquire the shape of the commutator segments and, so, will ensure maximum contact with them.
Juned67:
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because it is a good conductor of electricity so it is used in the manufacturer of Ac dynamo
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