Computer Science
Grade 3
20 min
Building a Computer (Paper Model)
Students create a paper model of a computer, labeling the different components.
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1
Introduction & Learning Objectives
Learning Objectives
Identify the five main parts of a computer from paper cutouts: CPU, RAM, Hard Drive, Motherboard, and Power Supply.
Describe the job of each main computer part using a simple analogy (e.g., 'The CPU is the brain').
Explain that all parts must connect to the motherboard to work together.
Follow step-by-step instructions to place paper hardware components onto a paper motherboard diagram.
Use simple conditional logic ('If...then...') to explain how computer parts interact (e.g., 'If the computer needs to think, then it uses the CPU').
Differentiate between short-term memory (RAM) and long-term storage (Hard Drive).
Have you ever wondered what's inside a computer, a tablet, or a phone? 🤖 Let's pretend we're build...
2
Key Concepts & Vocabulary
TermDefinitionExample
MotherboardThe main circuit board that holds and connects all the other parts. It's like the computer's body or skeleton.On our paper model, the motherboard is the big flat piece that has special spots drawn on it for all the other parts to be placed.
CPU (Central Processing Unit)The 'brain' of the computer. It does all the thinking, calculating, and tells the other parts what to do.When you click a mouse, the CPU is the part that figures out what you clicked on and what should happen next.
RAM (Random Access Memory)The computer's short-term memory. It's a super-fast workspace where the computer holds information it's using right now.If you are drawing a picture on the computer, the picture is held in RAM while you work on it. When...
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Core Syntax & Patterns
The Motherboard Connection Rule
IF a part needs to talk to another part, THEN it must be connected to the motherboard.
Use this rule to remember where to place your paper parts. The motherboard is the main hub, and everything plugs into it so they can work together as a team.
The Power Rule
IF a part is going to work, THEN it needs power from the Power Supply.
When building your model, imagine drawing a line from the Power Supply to every other part. This reminds us that without power, nothing can happen.
The Brain's Job Rule
IF an action happens (like a mouse click), THEN the CPU is the part that decides what to do.
This rule helps us understand that the CPU is the boss. It receives information about an event (the click) and gives instructions to other parts.
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Challenging
Your friend builds a paper computer but forgets to install the paper CPU. They say, 'It's okay, the computer will just be a little slow.' Why is your friend incorrect?
A.Because without the CPU, the computer will actually be much faster.
B.Because without the 'brain' (CPU), the computer cannot think and will not work at all.
C.Because the CPU only controls the mouse, so only the mouse won't work.
D.Because the CPU is only for storing pictures.
Challenging
Let's pretend computer data is a letter. The Hard Drive is a filing cabinet where many letters are stored. The CPU is the person who reads the letter and decides what to do. In this story, what is the RAM?
A.The desk where you place the one letter you are reading right now.
B.The envelope the letter came in.
C.The mailbox where the letter was first delivered.
D.The pen used to write the letter.
Challenging
You are asked to design a new paper part for your model: a 'Cooling Fan'. Based on what you know about real computers, what would its main job be and where should you attach it?
A.Job: Make the computer look cool. Attach it to the front of the case.
B.Job: Clean dust out of the computer. Attach it near the hard drive.
C.Job: Stop the CPU from getting too hot. Attach it on top of or next to the CPU.
D.Job: Make the power supply stronger. Attach it to the power cord.
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