bakeo @ world

        What has the telephone done to us, or for us, in the hundred years of its existence? A few effects suggest themselves at once. It has saved lives by getting rapid word of illness, injury, or fire from remote places. By joining with the elevator to make possible the multi-story residence or office building, it has made possible — for better or worse — the modern city. By bringing about a great leap in the speed and ease with which information moves from place to place, it has greatly accelerated the rate of scientific and technological changes and growth in industry. Beyond doubt it has seriously weakened if not killed the ancient art of letter writing.

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One of the key inventions in the history of electronics, and in fact one of the most important inventions over period, was the transistor. It was invented by Bell Laboratories in 1984. In sort, a transistor is a device that conducts a variable amount of electricity through it , depending on how much electricity is input to it. In other words, it is a digital switch. However,unlike the vacuum tube, it is solid state. This means that it doesn’t change its physical form as it switches. There are no moving parts in a transistor.