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These computers were very big and expensive, they consumed a lot of energy,they used vacuum tubes and the first generation computer that existed was the ENIAC
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These computers were more advanced than the first generation computers, in this case, second generation computers started using transistors.
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These computers went after the second generation computers , the third generation computers were too much more cheaper and they used integrated circuits.
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These computers produced less heat and they used less energy than the last generation ones, and they also started using microprocessors.
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These kind of computers will appear in the future and they will use artificial inteligence.