ENIAC

ENIAC short for Electronic Numerical Integrator And Computer was the first general-purpose electronic computer. When it was finished, the ENIAC filled the entire room. Weighted thirty tons, and consumed two hundred kilowatts of power. It generated so much heat that it had to be placed in a room with a forced air-cooling system. Vacuum tubes over 19000 of them were the principal elements in the computer's circuitry. In one second, ENIAC could perform 5,000 additions, 357 multiplications and 38 divisions!