239Electrical EngineeringMedium
Copper brushes in D.C. machine are used________?
Ain none of the above cases
Bwhere low voltage and high currents are involved
Cwhere high voltage and small cur-rents are involved
Din both of the above cases
Correct answer
B. where low voltage and high currents are involved
Explanation
The correct answer is where low voltage and high currents are involved.