Question
Download Solution PDFMs. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is A split-ring type commutator.
Key Points
- To convert an AC (alternating current) generator to a DC (direct current) generator, a device called a commutator needs to be connected.
- The commutator is a rotary switch that reverses the direction of current in the coil windings of the generator, thereby converting AC to DC.
- Split ring commutator:
- A slip-ring commutator simply establishes a connection or contact between the rotating rotor and the fixed stator, but a split-ring commutator causes the current to change direction every alternate half-rotation.
- Because the current direction changes every half-rotation and the split ring commutator reverses the current trajectory for every alternate half-revolution, it changes the current state to positive every half-cycle.
- The rotor coil is connected to the split ring commutator (armature). The armature is often composed of several coils of insulated wire wrapped around an iron core, with each termination point connected to one side of the commutator. Current flows in it, which interacts with the magnetic field to produce torque.
- AC to DC generator: An alternating current generator is a mechanical device that converts mechanical energy into alternating current electrical power.
Additional Information
- Slip rings and brushes: The main function of these slip rings is to transmit electrical power to a coil that is at rest to move or rotate it specifically. A carbon brush is attached to the slip ring. It helps in transmitting the electric current received from the slip ring further in the circuit.
- A stronger magnetic field: Magnetic lines being close to each other means a strong magnetic field and lines being far from each other means a weak magnetic field. The magnetic field is strongest at the poles of a magnet, so the lines at the poles are close to each other.
Last updated on May 30, 2025
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