Lesson Notes By Weeks and Term v4 - JHS 1

Lesson Video

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Performance objectives

• Describe the characteristics of fourth-generation computers.
• Identify key components of a computer system.
• Compare fourth-generation computers with earlier ones.
• Explain the impact of computer technology in Ghana.

Lesson summary

Today, we use smartphones, laptops, and tablets every day. These devices are small, powerful, and easy to use. But have you ever wondered how they became this way? Computers were not always like this. They have gone through different stages of development called "generations." This lesson focuses on the fourth generation, a very important stage that made computers personal and accessible to many people for the first time, laying the foundation for the devices we use in Ghana today for everything from Mobile Money to online learning.

Lesson notes

What are "Generations of Computers"? The history of computers is divided into 'generations'. Each generation is marked by a major technological breakthrough that changed how computers were built and how they worked. These changes made them smaller, faster, cheaper, and more powerful than the generation before.

We have moved from: First Generation (Vacuum Tubes) Second Generation (Transistors) Third Generation (Integrated Circuits) Fourth Generation (Microprocessors) - Our focus for today! Fifth Generation (Artificial Intelligence) The Fourth Generation of Computers (Approx. 1971 - Late 1980s)

This is the era where computers started to look like the ones we recognise today. They moved from giant rooms in universities and big companies to desktops in offices and even homes.

A. Key Technology: The Microprocessor (VLSI) The most important invention of the fourth generation was the microprocessor. What is a microprocessor? Imagine taking all the important parts of a computer's brain (the Central Processing Unit - CPU) and shrinking them down to fit onto a single, tiny silicon chip, often smaller than your thumbnail! Analogy: Think of it like this. In the third generation, you had a circuit board with many separate small chips to do the work. In the fourth generation, engineers found a way to put all those chips together into ONE super-chip. This is the microprocessor. The technology that made this possible is called Very Large Scale Integration (VLSI). It means engineers could fit hundreds of thousands (and later millions) of transistors onto one small chip.