The following are some important subtopics on AC Current Generator that are typically covered in the JEE exam preparation:

1. Basic Principles of AC Current Generation:

• Concept of alternating current (AC) and its advantages over DC. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Principle of electromagnetic induction. (Ref: NCERT Class 12 Physics, Chapter 6: Electromagnetic Induction)

• Faraday’s law of electromagnetic induction. (Ref: NCERT Class 12 Physics, Chapter 6: Electromagnetic Induction)

• Lenz’s law and its application in AC generators. (Ref: NCERT Class 12 Physics, Chapter 6: Electromagnetic Induction)

2. Construction of AC Current Generator:

• Basic structure and components of an AC generator. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Armature winding and field winding. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Slip rings and brushes. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Function of commutator in DC generators (brief comparison with AC generators). (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

3. Types of AC Current Generators:

• Single-phase AC generators. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Three-phase AC generators. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Comparison between single-phase and three-phase AC generators. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

4. EMF Generation in AC Current Generator:

• Derivation of EMF equation for AC generators. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Frequency of AC emf. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• RMS value and average value of AC emf. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Phasor representation of AC emf. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

5. Factors Affecting EMF Generation in AC Generators:

• Effect of armature speed. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Effect of number of armature conductors. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Effect of magnetic field strength. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

6. Armature Reaction and its Effects:

• Concept of armature reaction. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Demagnetizing effect of armature reaction. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Cross-magnetizing effect of armature reaction. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Compensating windings to mitigate armature reaction. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

7. Synchronous Speed and Slip:

• Definition of synchronous speed. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Calculation of synchronous speed. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Concept of slip. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Relationship between slip, synchronous speed, and frequency. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

8. Regulation of AC Current Generator:

• Need for voltage regulation. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Methods of voltage regulation:

• By varying field current. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• By using AVR (automatic voltage regulator). (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

9. Applications of AC Current Generators:

• Power generation in power plants. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Industrial applications: motors, transformers, appliances, etc. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Renewable energy sources: wind turbines, hydroelectric generators, etc. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

10. Troubleshooting and Maintenance of AC Current Generators:

• Common problems and their solutions. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Preventive maintenance measures. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)

• Importance of regular servicing and maintenance. (Ref: NCERT Class 12 Physics, Chapter 7: Alternating Current)