1. MEANS OF COMMUNICATION experthow.com

2. What are they? What do you know about them?

3. The telegraph tecno 12-18.com button transmitter receiver electromagnet Strip of paper source of electricity

4. 1.The button is activated. HOW DOES THE TELEGRAPH WORK? 2. The current passes through the channel 4.The pointer draws points and lines. 3. The electromagnet recieves the signal and moves a pointer.

5. TELEGRAM: It is the sent or received message through the telegraph metroposdcard.com

6. The telephone handset microphone receiver Hanset cord Telephone cable Tecno 12-18.com Switch hook console Dialling pad Feature buttons

7. How does the telephone work? 1.Transformation of the sound into an electrical signal. 2.Transportation of the signal. 3.Regeneration of the sound from the electrical signal. www.antiquetelephonehistory.com/images/telewo...

8. RADIO Electromagnetic wave radio frequency “carrier waves” amplitude modulation frequency modulation (AM) (FM)

9. RADIO TRANSMISSION DIAGRAM qwickstep.com

10. The TV camera The TV camera turns a picture and sound into a signal How does the camera work? 1.Lens 2.Semiconductor material 3.Beam of electrons

11. The TV receiver A: Cathode D: Phosphor coated screen B: Conductive coating E: electron beams C: Anode F: Shadow mask

12. How does the TV receiver work? 1.The TV camera turns a picture and sound into a signal 2.The TV transmitter sends the signal through the air. 3.The TV receiver captures the signal and turns it back into picture and sound.

13. THE INTERNET It is a global network connecting millions of computers. KEY VOCABULARY: 1.Modem: It connects a the computer to the telephone line. 2.Browser: It displays web pages on the computer screen. 3.www(world wide web): collection of multimedia web pages that can be displayed using a browser. www.microsoft.com/.../68573-router-diagram.gif I

14. HOW DOES THE INTERNET WORK? consumer.hughesnet.com/img/howitworks.gif