Computer Science
Grade 3
20 min
Review and Reflection: My Computer Knowledge
Students summarize what they learned about computer hardware and its importance.
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1
Introduction & Learning Objectives
Learning Objectives
Identify the four main hardware parts inside a computer: CPU, RAM, Storage, and Motherboard.
Describe the job of each main hardware part using a simple analogy (e.g., CPU is the brain).
Explain the difference between temporary memory (RAM) and long-term storage (Hard Drive).
Connect an input event (like a mouse click) to a series of actions performed by the computer's hardware.
Trace the path of information from an input device, through the CPU, to an output device.
Reflect on how different hardware parts work together to run a program they use, like a game or drawing app.
Have you ever wondered what makes your computer or tablet light up and play games? 🤔 It's like a secret team of tiny robots working together inside!
In this lesson, we will...
2
Key Concepts & Vocabulary
TermDefinitionExample
CPU (Central Processing Unit)The 'brain' of the computer. It thinks, makes decisions, and tells all the other parts what to do.When you click on a game, the CPU is the part that understands you want to play and starts the game.
RAM (Random Access Memory)The computer's short-term memory or 'workbench'. It holds the information for whatever you are working on right now.When you open a drawing app, the colors and brushes are kept in RAM so you can use them quickly.
Storage (Hard Drive or SSD)The computer's long-term memory, like a filing cabinet or a backpack. It saves your games, pictures, and files even when the computer is off.When you save your drawing, it goes into Storage so you can open it again tomorrow.
MotherboardThe 'body�...
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Core Syntax & Patterns
The Event-Action Rule
IF an event happens (like a key press), THEN the CPU decides on an action (like showing a letter on the screen).
This rule explains how your actions (events) trigger the computer's brain (CPU) to do something. It's the basic cause-and-effect for computers.
The Workbench Rule
To work on a file, the CPU must move it from Storage (the filing cabinet) to RAM (the workbench).
Use this to remember that the computer can't work on things directly from its long-term storage. It needs to bring them into its active, short-term memory first.
The Teamwork Rule
No single part does everything. The CPU, RAM, Storage, and other parts must work together as a team.
This helps you remember that a computer is a system. The brain (CPU) is the boss, but...
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Challenging
Your computer is on, but it is running VERY slowly when you try to play your favorite game. Based on what you know about hardware, what is the MOST LIKELY reason?
A.The power cord is not plugged in all the way.
B.The computer doesn't have enough RAM to hold all the game's information at once.
C.The speakers are turned off.
D.The hard drive is completely full and has no space to save anything.
Challenging
You save a one-page story with only words. Then you save a one-minute video with sound and moving pictures. Which file needs more 1s and 0s to be stored on the hard drive, and why?
A.The story, because letters are very complicated for a computer to store.
B.The video, because it contains much more information (many pictures per second, plus sound) that needs to be turned into code.
C.They both take up the same amount of space.
D.The story, because the computer has to save the color of the page and the font style.
Challenging
IF a computer part's job is to hold the instructions for a program you are currently using, BUT ONLY while the power is on, THEN which part is it?
A.The Hard Drive, because it holds all programs.
B.The CPU, because it runs the instructions.
C.The Power Supply, because it controls the power.
D.The RAM, because it is temporary, fast memory.
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