Features of System Unit – Basic 2 Basic Science Lesson Note (First Term)

Learning Objectives: By the end of this lesson, pupils should be able to:

• identify the different features of the CPU and state its functions

Lesson Content:

More CPU Features (Detailed Review):

Inside the CPU Box: Although we mainly see the outside, inside the CPU box there are important parts:

• Motherboard: Main circuit board that connects everything
• Memory (RAM): Temporary storage for programs being used
• Hard Drive: Permanent storage for all files and programs
• Power Supply: Converts electricity to power computer parts

External Features (Detailed):

Types of Ports:

• USB Ports: Usually 4-8 ports for many devices
• Audio Ports: Usually 3 – for speakers, microphone, headphones
• Video Port: For monitor connection
• Ethernet Port: For internet cable
• Power Port: Only one for power cable

Types of Buttons:

• Power Button: Usually round, sometimes with power symbol
• Reset Button: Usually small, sometimes hidden
• Disc Eject Button: If computer has CD/DVD drive

Indicator Lights:

• Power LED: Shows computer is on (usually green or blue)
• Hard Drive LED: Flashes when computer is working
• Network LED: Shows internet connection

Functions Summary: Each feature has a specific job to help the computer work properly and connect with other devices we need.

Safety with CPU:

• Don’t block air vents (computer needs to breathe)
• Keep liquids away from all ports
• Don’t force connectors into wrong ports
• Turn off computer before connecting new devices
• Keep CPU in clean, dry place