Lesson Notes By Weeks and Term - Primary 5

Classification by generation





TOPIC: Classification By Generation

The following are the five generations of computers.

First Generation of Computers (1942-1955)

When computers were first made, they were large and costly. They gave out heat when used. They were also slow in making calculations and could only store very few items of information. They also needed much electricity before they could be used.

fig. 1

Second Generation Computers (1955-1964)

fig. 2

Soon, the large, costly and slow computers were no longer used by many people. New computers which were cheaper and smaller than the first ones had been made. These were the second generation computers. These new computers stored many more items of information than the earlier computers. They also used less electricity. These second generation computers worked faster than the first generation computers. Third Generation Computers (1964-1975)

fig. 3

Third generation computers

In the third generation computers, the electric pathways were all joined as one, inside the computers. This was called an integrated circuit. Electricity therefore moved very fast through the computers. The third generation computers were cheaper, smaller and faster than the second generation computers. They also used less electricity and gave out less heat when used. Many people soon began to use the third generation computers.

Fourth Generation Computers (1975-Present)

fig. 4

The type of computers we use today are the fourth generation computers. The electric pathways are even more completely joined inside the computers. They are therefore said to have large-scale integrated circuits. The large-scale integrated circuits have made the fourth generation computers better than all the earlier ones. They are smaller, cheaper and store more items of information than the third generation computers. The fourth generation computers have made computers to be well known all over the world.

Fifth Generation Computers (Present & Beyond)

The makers of computers are still working hard to make even better computers. These are the fifth generation computers.

They are the next generation of computers. Scientists think that these computers will act like human beings


  2. Mention the generation of computers

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