In AC generators, what component is used instead of a commutator?

In AC generators, what component is used instead of a commutator?

• A. Slip rings
• B. Coils
• C. Stators
• D. Wires

Answer: (A)

In AC generators, the induced voltage is inherently alternating as the rotor’s magnetic field changes with rotation, so you don’t need a device to reverse the connection to the external circuit. Instead, slip rings provide a continuous, non-reversing connection between the rotating windings and the stationary circuit. Brushes ride on these rings to carry the AC out, keeping the contact stable throughout rotation. A commutator is used in DC machines to flip the connection and produce unidirectional current; here it isn’t needed because the output is already alternating. The other components—coils, stators, and wires—are part of the machine’s construction, but the function that transfers the AC from rotor to outside without reversing polarity is served by slip rings.

In AC generators, the induced voltage is inherently alternating as the rotor’s magnetic field changes with rotation, so you don’t need a device to reverse the connection to the external circuit. Instead, slip rings provide a continuous, non-reversing connection between the rotating windings and the stationary circuit. Brushes ride on these rings to carry the AC out, keeping the contact stable throughout rotation. A commutator is used in DC machines to flip the connection and produce unidirectional current; here it isn’t needed because the output is already alternating. The other components—coils, stators, and wires—are part of the machine’s construction, but the function that transfers the AC from rotor to outside without reversing polarity is served by slip rings.