Question

in electric motors and electric generators, which part is responsible for transferring current from the power source to the commutator or from the slip rings to where the electricity is needed?
armature
brush
axle
magnet

Explanation:

Brushes in electric motors and generators make sliding - contact with the commutator or slip - rings to transfer current. The armature is the part where the induced emf or current is generated or where the current flows to produce motion. The axle is for mechanical rotation. The magnet provides the magnetic field.

Answer:

B. brush