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In the 20 Century the electricity was invented
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The first Generation of computers used vacuum tubers
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The ENIAC was a first generation of computers, it weigted 27 tons. It occupied a room of 167m2 and worked with 17.500 vacuum tubes which could raise the room temperature up to 50ºC
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The second generation of computers used transitors that are faster than vacuum tubers that's why it was smaller and cheaper
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The third generation used integrated circuits which are like transitors but much faster (1000 times faster) that's why it uses less electricity and are much faster
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The fourth generation of computers use mico-proccesors to procces the information faster, and they are smaller and produce less heat
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The fifth generation of computers instead of human will be AI (ARTIFICIAL INTELLIGENT)