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Flashcards

techno

LU - Spanish 54 cards

Cards in this deck (54)

  1. 1Definition of communicationis the transmission of information from one place to another
  2. 2the process of communication involvesa transmitter, channel/medium, message and receiver
  3. 3Definition of telecomunicationwhen communication takes place over the distance
  4. 4When does the electric signals appear?ºthey appear in the 19th century
  5. 5Does the analogue signal have infinite values?yes it does
  6. 6The analoge signals aren't continousthats false
  7. 7the random signals in analogue signals are unpredictablecorrect
  8. 8How many bits does the electrical signal have?2 bits (0/01)
  9. 9Digital signals are continous or notno they arent
  10. 10The peridoc signals are predictable or unpredictablethey are predictable
  11. 11what the periodic signnals follow?they follow a mathematical formula
  12. 12wire transmission= with/without cableswith
  13. 13wireless transmission= with/without cableswithout
  14. 14Visible definition:is a tiny part of the electromagnetic spectrum
  15. 15Light definition:travels in a straight line, in all directions at a constant speed
  16. 16Primary source definition:the object generates the light they emit
  17. 17Secondary source definition:the object reflects or transmits the loght that primary source generates.
  18. 18When was the telegraph inventedit was invented in 1830
  19. 19T/F: The telegraph was the first time and long-distance communication system,T
  20. 20T/F: It consists of an electrical cable that links one stationsF (it links two stations)
  21. 21S. Morse created a code based on a combination of __________ and ________ to represent the alphabet.dashes and dots
  22. 22The landilne telephone was created by Bell true or false?F: It was created by Antonio Meucci in 1854, but Bell turned it famous (1876).
  23. 23landline telephone was created in...1854
  24. 24landline telephone allows the transmission of ...voice and sound signals
  25. 25How does a lanline telephone work?A sound wave produces vibration in a membrane that produces changes in pressure and those changes are codified in electrical signals that travel to the telephone network till it arrives at the receiver where the speaker transmits the electrical signals to another membrane that vibrates to reproduce the original sound
  26. 26When was the first call without cablesThe first call without cables was in 1973
  27. 27by who was the first call without cablesby motorola
  28. 28who and wehn was created the iphoneby Steve Jobs in 2007
  29. 29In _____ the mobile phones had tactile display and internet connection.2010
  30. 30By who was the radi o invented?It was invented by G. Marconi
  31. 31Radio transmits voice, sound, and music through ...electromagnetic waves.
  32. 32WIch is the porblem with the frequency of the sound wavesthe frequency is really low
  33. 33why do we use a carrier wave?because it augments the frequency
  34. 34electrical signal + carrier wave=MODULATION WAVE
  35. 35. A __________ separates the electrical signal and the carrier wave to amplify the electric signal to the speakers.RECEIVER MODULATOR
  36. 36AT __________the first TV was created1925
  37. 37The _____ was the first channel that transmitted a ____ minutes/ day programBBC, 30
  38. 38The tv work by wich cableoptical cable
  39. 39Wave definition:Is a disturbance that moves through a medium (water, air, vacuum). Some waves can transmit energy.
  40. 40AMPLITUDE (A) deffinitionThe maximum of value of the high of the wave. Meters.
  41. 41WAVELENGTH definitionThe distance between two consecutive points that are in phase. Meters.
  42. 42F: FREQUENCY definitionNumber of vibrations by second. Hertz.
  43. 43T: PERIODTime that takes a wave to do ONE cycle. Second.
  44. 44The mobile devices transform an analoge signol into a digital signal TRUE OR FALSETRUE
  45. 45Why the electromagnetic signals of the movile phone are not able to travel through very logn distances?due to that they lose their stenght
  46. 46because why do the electromagnetic signals loose their strenghtbecause of:
    •Physical objects (tunnels, buildings)
    •Electronical equipment
    •Environmental factors
  47. 47solution for the mobile phone problem of the electromagnetic waveSOLUTION
    •Cell towers
    •Cellular technology
  48. 48definition of bandwidthis the amount of information per second that a connection can transmit (bits/second)
  49. 49the cxables used on the wire transmissin depend onbandwitdth
    signal
    distance
  50. 50the pair cables are used for....telephone lines
  51. 51the pair cables are made of...pair of copper wires
  52. 52the coaxil cables are used forfir the antenna ti te TV set
  53. 53the coaxial cables are made of...copper core, insulator layer, copper core, insulator layer
  54. 54characteristic of pair cable

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Flashcards on techno, created by LU - on 27/11/2021.
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LU -
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