Discussion
A metal-graphite brush grade is chosen in preference to plain carbon where
Answer: A
Correct answer: the current density is high and the voltage low
Metal-graphite brushes contain copper or another metal, so their resistivity and their contact voltage drop are much lower than plain carbon. That suits a machine carrying a large current at a low voltage, such as a plating or traction machine, where the loss in a carbon brush would be a large fraction of the output.
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