Course Content
Part 1: What Does the CPU Really Do?
What Is a CPU and Why Is It So Important? The Difference Between RAM, Storage, and the CPU What Happens When You Click a Button on Your Computer?
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Lesson 1: What Is a CPU and Why Is It So Important?
Lesson 2: How the CPU, RAM, and Storage Work Together
Lesson 3: What Happens When You Click Something on Your Computer?
Lesson 4: A Closer Look Inside the CPU
Part 2: Now Let’s Dive Into the CPU.
Let’s open the brain of the computer and peek inside!
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Lesson 1: What Are Registers and Why Are They So Fast?
Lesson 2: The ALU — The Tiny Calculator Inside Your Computer
Lesson 3: The Control Unit – The CPU’s Bossy Time-Keeper
Lesson 4: What Is a Clock Cycle and Why Does Speed Matter?
Part 3: How Instructions Are Followed
Show how the CPU fetches, decodes, and runs instructions using a simple loop.
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Lesson 1: What Is an Instruction?
Lesson 2: How Does the CPU Read Instructions One by One?
Lesson 3: The Fetch–Decode–Execute Cycle (Made Super Simple)
Lesson 4: What Happens in Just One Second Inside the CPU?
Part 4: How the CPU Does Math and Logic
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How Flipping a Switch Sends a Message
Why Computers Are Made of Millions of Switches
How Can a Switch Help Make a Choice?
Let’s Build an AND Gate with Switches
OR and NOT — Other Smart Rules Computers Use
Combining Logic to Make Smarter Machines
How Logic Gates Become a Computer’s Brain
🧩 How Computers Use Yes and No to Count Numbers
➕ How to Add Using Wires and Logic Rules
How the CPU Adds and Subtracts with Only Switches
AND, OR, NOT — The CPU’s Way of Making Choices
How the CPU Compares Things and Decides What to Do
Math Tricks Computers Use to Work Faster
Part 5: How the CPU Talks to Memory and Storage
This part will explain how the CPU and memory are like two people trying to talk across a busy room — and why the CPU needs clever helpers like RAM and cache instead of going straight to the hard drive.
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Lesson 1: Why the CPU Doesn’t Talk to the Hard Drive Directly
Lesson 2: What’s a Cache and Why Is It So Fast?
Lesson 3: How the CPU Sends and Gets Data from RAM
Lesson 4: What Happens When There’s Too Much to Remember?
Part 6: Paths and Highways: How CPUs Talk to Everything
So far, we’ve learned how the CPU works with RAM, cache, and storage. But the CPU doesn’t live alone — it has to talk to memory, graphics cards, USB sticks, and more.
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Lesson 1: What Is a Bus? (Not the Kind You Ride)
Lesson 2: How Data Travels Inside a Computer
Lesson 4: How the CPU Works with the Graphics Card and the Motherboard
Lesson 5: What Happens If Two Parts Try to Talk at Once?
How CPUs Are Getting Faster and Smarter
Now: Let’s zoom into what makes modern CPUs so much faster.
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Lesson 1: What Is a Core, and Why Do Some CPUs Have Many?
Lesson 2: How Pipelining Helps the CPU Do More Things at Once
Lesson 3: Why CPUs Get Hot and How CPU Designs Differ
How Computers Think: Inside the CPU

🔍 Why This Matters

We know that circuits can open and close. But how does flipping a switch actually send a message inside a machine?

It seems so simple—but it’s the key to how all computers work.

 

🖱️ Switches: Tiny Decision Makers

A switch is a tiny device that opens or closes a circuit.

  • When it’s open, electricity stops.

  • When it’s closed, electricity flows.

That change is meaningful. It’s like saying:

  • “Off” becomes “On”

  • “No” becomes “Yes”

  • “0” becomes “1”

That’s a message. A simple one, but a real one.

 

💭 Let’s Try an Example

Imagine you have 8 light bulbs.
Each bulb is connected to a switch.

You can:

  • Turn all ON

  • Turn all OFF

  • Turn some ON and some OFF

Each bulb becomes a piece of a code.
Together, the ONs and OFFs form a pattern. And patterns can mean anything:

  • A letter

  • A number

  • A picture

 

📶 So Every Switch = 1 Bit

A bit is the tiniest piece of information in computing. It can only be:

  • ON (1)

  • OFF (0)

That’s what computers do: flip bits—switches—very fast.

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