The four generations of computers
The first generations of computers
The first generation of computers started with ENIAC, the first computer to use electronic valves/vacuum tubes. The first generation of computers were massive shelves and mainly used for calculations. They only had one use per computer and no operating system making them quite primitive.
The second generation of computers
Punch cards, transistors and vacuum tubes
These were stiff pieces of paper that had holes punched into them. The computer would then recognise these holes as code.
Transistors were used to amplify electronic signals and also increased the processing power of the computer.
Vacuum tubes were used to control the flow of the electricity. However, they are now no longer used.