Copper brushes in D.C. machine are used
A)where low voltage and high currents are involved
B)where high voltage and small cur-rents are involved
C)in both of the above cases
D)in none of the above cases

Question

Quizplus · Accepted Answer

Copper brushes in DC machines are used where low voltage and high currents are involved because copper has a low resistivity, which minimizes the voltage drop and power loss at high currents.

Copper Brushes in D.C. Machine Are Used