中职电子专业英语第6章教学课件

1、正版可修改PPT课件(中职）电子专业英语第6章教学课件Warming-upI. Can you point out the difference of the following pictures?II.Do you know what the following symbols stand for?C FLHIII.Talk about Current in English. And the following patterns you can use: Do you know what is a capacitor?Could you tell me how many kinds of c

2、apacitors you know?Unit 6 Capacitor下一页返回Could you tell me the unit of capacitance?What is the symbol of capacitance?The unit / symbol of capacitance is .Can you tell the difference between inductor and capacitor?Text ComprehensionCapacitorElectrical energy can be stored in an electric field. The dev

3、ice capable of doing this is called a capacitor, which resists change in voltage.Capacitors are sorted into many types, such as the ceramic capacitor, the paper capacitor, the plastic film capacitor, the metal silicon dioxide capacitor and the electrolytic capacitor.Unit 6 Capacitor上一页下一页返回A simple

4、capacitor consists of a pair of parallel metal plates separated by air or other insulating material. If a capacitor is connected to a battery, the electrons will flow out of the negative terminal of the battery and accumulate on the plate connected to that side. At the same time, the electrons will

5、leave the plate connected to the positive terminal and flow into the battery to make the potential difference just the same as that of the battery. Thus the capacitor is said to be charged.If the external circuit of these two plates is completed by joining terminals together with a wire, the capacit

6、or can be discharged. The electrons start moving from one plate to the other through the wire to restore electrical neutrality.The property to produce a current in a capacitor when the voltage across it changes, is called capacitance. It is measured in Farads, which is so large a unit that, for prac

7、tical purposes, it is usually replaced by microfarad or picofarad.Unit 6 Capacitor上一页下一页返回The capacitance of a pair of separated conductors depends on the material between them. A parallelplate capacitor, for instance, has a capacitance of C = K0A/dWhereA is the area of the plate surface, d the spac

8、e between them, 0 the electrostatic constant found in coulombs law and K a factor that varies with the nature of the dielectric material between the plates. The larger the plate area, the smaller the space between them, the greater the capacitance.Unit 6 Capacitor上一页下一页返回Vocabulary.1. capacitor n. 电

9、容器11. charge v. 充电 n. 电荷2. sort v. 分类，拣选 12. external adj. 外部的 n. 种类，类别13. discharge v. 放电3. ceramic adj. 陶器的14. restore v. 恢复4. plastic adj. 塑料的15. neutrality n. 中性5. film n. 薄膜，膜层16. capacitance n. 电容6. silicon n. 硅，硅元素17. farad n. 法拉7. dioxide n. 二氧化物18. electrostatic adj. 静电（学）的8. electrolytic a

10、dj. 电解的，电解质的 19. factor n. 要素，因素9. insulate v. 使绝缘，使绝热20. dielectric n. 介质，绝缘体10. accumulate v. 堆积，聚集Unit 6 Capacitor上一页下一页返回Phrases and expressions1. ceramic capacitor陶瓷电容器2. paper capacitor纸制电容器3. plastic film capacitor （塑料）薄膜电容器4. metal silicon dioxide capacitor金属二氧化硅电容器5. electrolytic capacitor电

11、解电容器6. capable of 能够的7. be connected to 连接到8. at the same time 同时Unit 6 Capacitor上一页下一页返回Notes1. “a capacitor, which resists change in voltage” “which”引导非限定性定语从句。2. “which is so large a unit that”非限定性定语从句；我们可以把”so large a unit that”换成我们常用的结构“such a large unit that”。I Choose the right answer from A,

12、B, and C according to the text. 【 】1.The device capable of doing this is called a capacitor. In this sentence, what does “this” represent?A. capacitorB. electrical energy C. electrical energy can be stored in an electric field.【 】2. A capacitor resists change in _.A. currentB. voltageC. resistanceUn

13、it 6 Capacitor上一页下一页返回【 】3. If a capacitor is connected to a battery, the electrons will flow from _ to _ terminal.A. negative, positiveB. positive, negativeC. Not mentioned.【 】4. You can join the two terminals of a capacitor together with a wire, _.A. when you want to discharge the capacitorB. when

14、 you want to charge the capacitorC. when you want to get a high voltage【 】5. Which one is correct?A. The smaller the plate area, the larger the space between them, the greater the capacitance.B. The smaller the plate area, the larger the space between them, the smaller the capacitanceC. The larger t

15、he plate area, the larger the space between them, the greater the capacitance.Unit 6 Capacitor上一页下一页返回II True or false.1. The capacitor can resist the change in current.2. The electrolytic capacitor is one kind of capacitors.3. If a capacitor is connected to a battery, the electrons will flow from n

16、egative to positive terminal.4. when we join two terminals of a capacitor with a wire, the capacitor can be charged.5. The unit of capacitance is Henry.III Translate the following sentences.1. Electrical energy can be stored in an electric field.2. The device capable of doing this is called a capacitor, which resists change in voltage.3. A simple capacitor consists of a pair of parallel metal plates separated by air or other insulating material.Unit 6 Capacitor上一页下一页返回4. If a capacitor is connected to a battery, the electrons will flow out of the negative terminal of the batt