Regarding DC motors, which of the following statements is true___________
A. The principle of the DC motor is the magnetic effect of the current
B. When the DC motor is working normally, it converts electrical energy into mechanical energy
C. The commutator of the DC motor is composed of two half-rings made of copper insulated from each other
D. Both B and C
Answer:D
Regarding DC motors, which of the following statements is true___________
A. The principle of the DC motor is the magnetic effect of the current B. When the DC motor is working normally, it converts electrical energy into mechanical energy C. The commutator of the DC motor is composed of two half-rings made of copper insulated from each other D. Both B and C