Lesson Notes By Weeks and Term v4 - Basic 6

Lesson Video

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Performance objectives

• Define computing and its importance.
• Identify different types of computers.
• Describe the basic components of a computer system.
• Differentiate between system and application software.
• Recognize the role of the internet in computing.

Lesson summary

Have you ever wondered how a computer, a phone, or even a simple calculator knows what to do when you press a button? It seems like magic, but it's actually a very logical process that all computers follow. This process is called the Information Processing Cycle. Understanding this cycle is like learning the secret recipe for how all digital devices work. In our daily lives in Ghana, from using a mobile money app to a cashier using a machine at the supermarket, this cycle is happening all around us. This lesson will demystify this "magic" and show you the simple, powerful steps computers use to get things done.

Lesson notes

The central idea for today is the Information Processing Cycle. This is the fundamental set of steps that a computer follows to turn raw facts (data) into useful information. Think of it like cooking your favourite Jollof rice: You take your ingredients (raw rice, tomatoes, onions, spices) - this is like INPUT. You cook them on the fire, mixing and heating them - this is the PROCESS. You serve the delicious, ready-to-eat Jollof rice - this is the OUTPUT. You put the leftovers in the fridge for later - this is STORAGE.

Every computer, no matter how big or small, follows these same four stages. Let's break them down. The Four Stages of the Information Processing Cycle (IPOS) Input Stage What it is: This is the first step where we feed raw data into the computer. Data can be numbers, text, images, or sounds. The computer cannot do anything until it receives instructions and data from us. How it works: We use input devices to send this data into the computer. Ghanaian Context: When you type a friend's phone number into your phone to send them MoMo, you are performing an input action. Examples of Input Devices: Keyboard: For typing text and numbers. Mouse: For clicking, pointing, and selecting things on the screen. Microphone: For recording sound or giving voice commands. Scanner: For converting a physical picture or document into a digital file. Webcam: For capturing video. Touchscreen: Allows you to input data by touching the screen directly. Process Stage What it is: This is the "thinking" stage. Once the data is inside the computer, the computer's brain works on it. It follows the instructions it was given to perform calculations, sort data, or change it in some way. How it works: This is done by the Central Processing Unit (CPU), often called the "brain" of the computer. The CPU, along with the computer's memory (RAM), manipulates the input data to turn it into useful information. Ghanaian Context: After you enter the MoMo details, the mobile network's computer (server) processes the request. It checks if you have enough money and if the PIN is correct. This is the processing stage. Key Processing Device: Central Processing Unit (CPU): This small chip does all the calculations and executes all the commands. Output Stage What it is: This is the result stage. After processing the data, the computer presents the useful information to the user. This is the answer to your question or the result of your command. How it works: We see or hear this information through output devices. Ghanaian Context: When you receive a confirmation message on your phone screen saying "Transaction Successful," that message is the output. Examples of Output Devices: Monitor (Screen): Displays text, images, and videos. Printer: Creates a physical paper copy of a document or image. Speakers/Headphones: Produces sound. Projector: Shows the computer's screen on a large wall or screen, like in a church or at a presentation. Storage Stage What it is: This is the "saving" stage. Sometimes, we want to keep our data or the resulting information for future use. Storage allows us to save our work permanently. How it works: The information is saved onto storage devices. This is different from the computer's temporary memory (RAM), which is cleared when the computer is turned off. Ghanaian Context: The mobile network provider keeps a record of all your MoMo transactions. This record is kept in storage so you can check your transaction history later. Examples of Storage Devices: Hard Disk Drive (HDD) / Solid State Drive (SSD): The main storage inside a computer where the operating system and your files are kept. USB Flash Drive (Pendrive): A small, portable device for saving and transferring files. Memory Card: Used in phones and cameras to store photos, videos, and other files. Cloud Storage: Saving files online (e.g., Google Drive, iCloud).

Diagram of the Cycle:

``` +-----------------+ | INPUT | (Keyboard, Mouse) +--------+--------+ | v +-----------------+ | PROCESS | (CPU) +--------+--------+ | v +-----------------+ | OUTPUT | (Monitor, Printer) +-----------------+ | | B: A printer produces a physical copy of information from the computer, so it is an Output** device. 2 -> C: The CPU is the brain of the computer that does all the thinking and calculations, so it is the Process stage. 3 -> A: A keyboard is used to type data *into* the computer, making it an Input device. 4 -> D: A USB drive is used to save files for later use, making it a Storage device.