Question

In an AC generator, name the part which has the following functions:
(a) intensifies the magnetic field.
(b) maintains electrical contact between the rotating parts and the external circuit.

Hint:

Remember the difference for generators: AC Generator uses \textbf{Slip Rings} (for alternating current). DC Generator uses a \textbf{Split-Ring Commutator} (to reverse the current every half rotation and produce direct current).

Answer 1

Step 1: Understanding the Concept:
An AC generator converts mechanical energy into electrical energy using electromagnetic induction. Various parts work together to maximize efficiency.
Step 2: Detailed Explanation:
(a) Soft iron core: The armature coil is wound around a soft iron core. Because soft iron has high magnetic permeability, it concentrates and intensifies the magnetic field lines through the coil, increasing the induced EMF.
(b) Carbon brushes and Slip rings: Slip rings rotate along with the armature coil. Stationary carbon brushes press against these rings, allowing current to flow from the rotating coil to the fixed external circuit without twisting the wires.
Step 3: Final Answer:
(a) Soft iron core (of the armature).
(b) Carbon brushes and Slip rings.