Meet just one panel from ENIAC (Electronic Numerical Integrator and Computer), which in 1946 was one of the largest and most power hungry electronic devices. It contained 18,000 vacuum tubes, 1,500 relays, 70,000 resistors, 10,000 capacitors and consumed enough power for 50 homes -- all this to perform for 5,000 calculations per second. Modern mobile phones can perform millions of calculations per second while modern supercomputers can do many, many trillion.