How telephones work humanities
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Transcript

  • 1. How Do telephone’s work
    Find out right now!
  • 2. Telephones
    Before there were any telephones invented, people used to send long letters which was very tiring. Now people use phones which can be taken anywhere. Now it is so technological that most people have I-phones, laptops etc.
  • 3. Who created the telephone??
    Alexander Graham bell created the first successful telephone in the world. He was Scottish-born inventor, scientist, and teacher who was widely credited as the inventor of the electric telephone. On March 7th 1876 he became the first to receive a patent for this device.
  • 4. More about his life
    While he was creating a telephone, at the same time he began working at the idea that speech could be transmitted electronically, as he accidentally discovered that the sound of a spring being twanged could be heard over his harmonic telegraph system. Almost a year later in March 1876 Bell uttered the first famous words into the device to his assistant in the next room.
  • 5. More about telephones…..
    Call signals to places close by travel along wires or cables buried underground .But when the person you call is very far away, the electrical signals sent from your phone are changed into invisible waves of energy called microwaves, which travel long distances through the air. These waves are send to space and it’s connected to satellite and then bounces back to earth. An antenna at a receiving station near the home of your friend picks up the waves and changes them to electrical signals once more. They travel by cable to the telephone office that services your friend's neighborhood, where his or her number is identified. The signal rings, your friend picks it up. There is a microphone connected her telephone, and then you hear it in seconds.
  • 6. How do telephones work?
    When you pick up a phone, a low electrical current allows you to dial the series of numbers that will connect you to the phone of a friend, for example. A local telephone office receives this information when you dial and sends your call in the right direction.
  • 7. Credits:
    http://www.answers.com/topic/how-do-telephones-work
    Presented By Bhumika Y6h
    My L.O:to know who created telephone and how it works
  • 8. Pictures of different telephones