ENIAC (Electronic Numerical Integrator and Computer) was the world’s first electronic general-purpose computer. It was designed and built for military purposes by the United States army. ENIAC was first introduced to the public in 1946.
ENIAC weighed 27 tonnes (30 tons) and covered an area of 167 square meters (1,800 square feet). However it could only execute 5,000 instructions per second. The modern iPhone is capable of performing 25 billion instructions per second. ENIAC was switched off on October 2nd 1955.
ENIAC (Electronic Numerical Integrator and Computer), the world’s first electronic general-purpose computer, was unveiled at the University of Pennsylvania in the year 1946 On This Day.

Photo by John Morton
ENIAC

Photo by Erik Pitti
ENIAC Tubes