1. Lesson 21 Marine Electrical System

2. Contents Basic Knowledge of Current Alternating Current Generator The Alternator Construction

3. Specifications (1) magnetic 磁性的 conductor 导体 stationary 静止的 connected with or produced by magnetism a substance that allows electricity or heat to pass along it or through it not moving; not intended to be moved

4. Specifications (2) amplifier 放大器 fluctuation 波动 eliminate 消除 an electrical device or piece of equipment that makes sounds or radio signals louder an irregular rising and falling in number or amount; a variation to remove or get rid of something/somebody

5. The Alternator Construction

6. Electrical Grounding

7. Electrical Elements

8. Special Terms (I) 1. 滑环 2. 极 3. 电磁铁 4. 极性 5. 电枢 6. 励磁机 7. 静止 8. 无电刷 9. 抵消 slipring pole electromagnet polarity armature exciter statically brushless counter

9. Special Terms (II) 10. 余弦 11. 乘积 12. 电感的 13. 电容性的 14. 滞后 15. 超前 16. 励磁 17. 放大器 18. 部件 cosine product inductive capacitive lagging leading excitation amplifier feature

10. Special Terms (III) 19. 震荡 20. 过调 21. 变压器 22. 整流器 23. 并激 hunting overcorrecting transformer rectifier shunt

11. Useful Expressions field coil star formation power factor prime mover series excitation 励磁线圈 星型接法 功率因数 原动机 串激

12. Assignment 1. Exercise II: 1-10 2. Reading comprehension 3. Summarize the text in your own words