Internal Components of a Computer SS1 Computer Hardware & GSM Repair Lesson Note

The Motherboard (The “Ground” of the City)

Imagine a large map or a foundation of a house. That is the Motherboard. It is a big plastic board (usually green or blue) with copper lines running all over it.

Why is it important? Every single part of the computer—the mouse, the screen, the brain, and the battery—must plug into the motherboard. It acts like a nervous system, carrying electrical signals from one part to another.

• Bus Tracks: Those tiny lines you see on the board are like “roads” for data to travel on.
• Slots: These are “parking spaces” where we plug in things like RAM or Video Cards.

The CPU (The “Brain” and “Chef”)

The CPU (Central Processing Unit) is a small, square chip, but it is the most powerful part of the machine.

What it does: It handles all the instructions. When you click a button, the CPU calculates what should happen next.

• The Heat Sink: Because the CPU works so hard, it gets very hot (like a person running a race). That’s why there is always a big metal “radiator” and a fan sitting right on top of it to keep it cool.

Analogy: If the computer is a kitchen, the CPU is the Chef. The Chef decides how to cook the food and makes sure everything is done correctly.

The RAM (The “Work Table”)

RAM stands for Random Access Memory. This is the computer’s Short-Term Memory.

How it works: When you open an app (like WhatsApp or a game), the computer moves that app from the “storage” onto the RAM so it can run fast.

• The Catch: RAM is “volatile.” This is a fancy way of saying that if the light goes out or you switch off the computer, the RAM forgets everything immediately.

Analogy: Think of the RAM as the Chef’s Table. If the table is small, the chef can only chop one onion at a time. If the table (RAM) is big, the chef can prepare many dishes at once without getting confused!

The Power Supply Unit (The “Heart”)

The Power Supply Unit (PSU) is that heavy metal box where you plug in the “neppa” or generator cord.

Its Main Job: The electricity from our wall sockets is too “strong” (High Voltage AC) for the tiny parts inside a computer. If you connected them directly, they would blow up! The PSU takes that strong electricity and converts it into “gentle” electricity (Low Voltage DC) that the motherboard can handle.

• The Fan: You’ll notice a fan on the back of your computer; that belongs to the PSU. It works hard to stay cool while converting power.

Putting it All Together

To understand how these four work together, let’s look at the “Startup Process”:

1. Power Supply: You press the button. The PSU sends “gentle” electricity to the Motherboard.
2. Motherboard: The Motherboard wakes up and sends a signal to the CPU.
3. CPU: The CPU says, “Okay, let’s get to work!” It asks the storage for the Operating System (like Windows).
4. RAM: The OS is loaded into the RAM so you can see your desktop and start clicking icons.

Summary Table

Class Activity: If a computer is “hanging” (acting very slow) when you open many tabs, which of the components above is likely too small or struggling?