At first generation computer, the vacuum tube (vacuum-tube) is used as a component of a signal amplifier. The raw material consists of glass, so many have drawbacks, such as: easy to break, and easy to distribute the heat. This heat needs to be neutralized by another component that serves as a coolant. Vacuum tubes as a signal amplifier, a hallmark of the first generation of computers.
In the images appear ENIAC computer, which is the world's first electronic computer which has a weight weighing 30 tons, a length of 30 M and 2.4 M high and requires 174 kilowatts of electrical power. On the computer contained 18,800 vacuum tubes and weighs 30 tons. so large in size, to the point that requires a separate classrooms. ENIAC is a first-generation electronic digital computer designed in 1942, and was made in 1943 by Dr. John W. Mauchly and John Presper Eckert, and completed it in 1946.
With the additional components, existing computer eventually becomes large, heavy and expensive. In 1946, the electronic computer in the world that the ENIAC (Electronic Numerical Integrator and Calculator) was finished first.
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