Properties of ENIAC
ENIAC was massive in its physical size if you compare it to modern PCs. It contained approximately 17,468 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000 capacitors and around 5 million hand-soldered joints, which weighed about 30 short tons (27 t). It consumed around 150 kW of power. ENIAC was reliable, programmable, though not as easy and user-friendly as the modern-day computers.