Discussion
Resistance commutation improves commutation by
Answer: A
Correct answer: using carbon brushes whose contact resistance forces the current to transfer
As the brush passes from one segment to the next, the area of contact with the leaving segment shrinks and that with the arriving segment grows. With a resistive brush material the resistance of the leaving path rises accordingly, and the current is progressively forced to transfer to the new segment rather than lingering and arcing at the break. Carbon is used precisely for this contact resistance, which is why it is preferred to copper despite its higher drop.
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