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cathode ray oscilloscope

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cathode ray oscilloscope

  1. 1. <ul><li>Analysing cathode rays </li></ul><ul><li>Termionic emission </li></ul><ul><li>Cathode rays </li></ul><ul><li>Characteristics of cathode rays </li></ul><ul><li>Maltese cross tube </li></ul><ul><li>Deflection tube </li></ul><ul><li>Energy change in Cathode rays tube </li></ul><ul><li>Chatode rays tube </li></ul><ul><li>Structure and funtion of Chatode rays tube </li></ul>Hajah rokiah smsc06 Chapter 3 : Electronic
  2. 2. Metal : atomic structure They posses a lot of free electron on the surface as a reason of their behavioral as a conductor .
  3. 3. When metal is heated its release electrons to its surface This is known as thermionic emission Electrons, e
  4. 4. A wire is made into a coil does it has the same resistance? Coil / solenoid Explain your answer. Suggested answer: Yes if it is an insulatored wire No if it is a bare wire (not insulatored) Key word : short circuit
  5. 5. What will happen when a coil is heated? vacuum What will happen if an anode is placed in the vacuum tube as shown in the above diagram? + e e e e e
  6. 6. Fluorescent effect on screen display by several electrical appliances Cathode rays Idea of the thermionic emission
  7. 7. (c)The Mechanism of Thermionic transmission METAL consists a lot of free electrons. At room temperature these electrons cannot escape from its surface. When heated, these electrons received enough energy to be transmitted on the metal surface. The producing of charges on the surface of a metal because of the heating effect is known as thermionic transmission
  8. 8. Electron gun tube
  9. 9. (e)Electron gun /Cathode ray tube <ul><li>Electron gun is an instrument to produce a beam of electrons at high speed . This high speed electrons is known as cathode rays </li></ul>
  10. 10. Electrical devices with electron gun such as; <ul><li>Television </li></ul><ul><li>Computer Screen(CRT) </li></ul>
  11. 11. Cathode rays is a high speed electrons beam <ul><li>The characteristics of cathode rays is studied in : </li></ul><ul><li>Maltese cross tube </li></ul><ul><li>Deflection tube / Perrin tube </li></ul>
  12. 12. Maltese cross tube Structure
  13. 13. Characteristic : travel in straight line, caused fluorescent effect, has energy and momentum Cathode ray
  14. 14. Maltese cross tube
  15. 15. Tiub Perrin / Deflection tube
  16. 17. DEFLECTION TUBE Deflection tube Cathode/ filament anode Metal plate Fluorescent screen Power supply 6V ac/dc EHT EHT (0 – 5kv) (0 – 5kv) + -
  17. 18. characteristics of cathode ray <ul><li>1. travel at straight line in vacuum </li></ul><ul><li>2. it has energy and momentum </li></ul><ul><li>3. it produces the fluorescent effect on fluorescent material </li></ul><ul><li>4. negatively charged. </li></ul><ul><li>5. deflect towards the positive terminal in the electrical field </li></ul><ul><li>6. deflect in magnetic field. Deflection direction is determine by Fleming’s left hand rule’ </li></ul><ul><li>7. it can ionize air or gaseous </li></ul><ul><li>8. it can penetrate through graphite layer or thin paper </li></ul><ul><li>9. it produces X-ray and heat when hitting at heavy metal </li></ul>
  18. 19. <ul><li>Charge for one elektron, e = 1.6 x 10 -19 C 11. Jisim satu elektron m e = 9 x 10 -31 kg </li></ul>
  19. 20. Perubahan tenaga yang berlaku Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya
  20. 21. Tiub sinar katod Tenaga keupayaan elektrik, E = QV Tenaga kinetik , ½ m e v e 2 Tenaga haba + cahaya e iaitu cas bagi satu elektron = 1.6 X 10 -19 C E = eV = ½ m e v e 2 eV = ½ m e v e 2 Prinsip keabadian tenaga
  21. 22. <ul><li>eV = ½ m e v e 2 </li></ul>Prinsip keabadian tenaga e = cas untuk satu elektron = 1.6 x 10 -19 V = beza keupayaan merentasi VLT m e = jisim bagi satu elektron = 9.1 x 10 -31 kg C V e = halaju sinar katod (elektron) V e = 2 eV m e √
  22. 23. <ul><li>1. Beza keupayaan merentasi anod dan katod sebuah senapang elekron ialah 8 kV.Berapakah tenaga kinetik elektron. </li></ul><ul><li>(e = 1.6 x 10 -19 C) </li></ul>
  23. 24. <ul><li>2. Dalam sebuah senapang elektron yang terdapat dalam TV beza keupayaan antara anod dan katod ialah 5 kV.Berapakah halaju elektron? </li></ul><ul><li>e = cas elektron, 1.6 x 10 -19 C , </li></ul><ul><li> m= jisim elektron 9 x 10 -31 kg </li></ul>
  24. 25. 3. Rajah menunjukkan satu bayang palang Maltase pada skrin pendarflour disebabkan oleh alur-alur elektron yang pada arah masuk ke dalam kertas.Jika dua batang magnet diletakkan,ke arah manakah bayang akan beralih .
  25. 26. <ul><li>4. Rajah menunjukkan satu bayang palang Maltase pada skrin pendarflour yang disebabkan oleh alur-alur elektron.Jika dua batang magnet diletakkan berhampiran dengannya ke arah manakah bayang itu beralih? </li></ul>Alur elektron magnet magnet
  26. 27. OSCILLOSCOPE CRO
  27. 28. CRO Functions Pelbagai bentuk OSK 1. Melihat/mempamerkan bentuk gelombang 2. Sebagai voltmeter 3. Mengukur sela masa yang singkat
  28. 29. CRO STRUCTURE
  29. 30. The structure of a cathode ray tube
  30. 31. Cathode ray tube , CRO
  31. 32. <ul><li>Senapang elektron </li></ul><ul><li>- katod,grid kawalan, anod memfokus dan anod memecut </li></ul><ul><li>Sistem pemesongan </li></ul><ul><li>- plat X dan plat Y </li></ul><ul><li>Skrin pendaflor </li></ul><ul><li>- di salut dengan satu lapisan bahan pendaflor </li></ul>Struktur OSK
  32. 33. <ul><li>Component : </li></ul><ul><li>Filament/ cathode :to </li></ul><ul><li>Heat cathode so electrons </li></ul><ul><li>is emitted through </li></ul><ul><li>The process of </li></ul><ul><li>thermionic emission. </li></ul><ul><li>Controlling Grid </li></ul><ul><li>Focusing Anode </li></ul><ul><li>Acccelerating anode </li></ul>(a) Electron gun Grid Focusing Anode Accelerating anode Cathode filament Electron beam
  33. 37. 1. Melihat/mempamerkan bentuk gelombang Segi tiga
  34. 40. Perbandingan a.t dan a.u. dalam paparan skrin osk Dasar masa di matikan Dasar masa di hidupkan a.t. a.u. a.u. a.t.
  35. 49. Osiloskop sinar katod
  36. 51. What happens when a coil / wire is heated?

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