SS 1 First Term

Lesson objectives

By the end of the week, learners should be able to:

1. Define a computer according to architectural principles.
2. State six characteristics of a modern computer.
3. Name the main hardware components and give their functions.
4. Explain why digital signals differ from analogue signals.
5. Classify devices by input, processing, output or storage role.

Key vocabulary

• Computer: a digital device that processes data under stored instructions.
• Architecture: the structural design specifying component interfaces.
• Digital signal: discrete values representing data.
• Analogue signal: continuous values varying in real time.
• Characteristic: an attribute describing a device.
• Interface: the boundary where components connect to each other.
• Role: the function assigned to each component.

Common misconceptions

• "A computer is just a box with a screen." The box contains internal components; the screen is only one output.
• "Digital signals are more complex than analogue signals." Analogue signals vary continuously and are harder to store reliably.
• "Every characteristic matters equally." Some characteristics are more measurable than others.

Teacher activities

1. Starter: open a system unit and ask the class which components are part of the computer architecture.
2. Define computer and name six characteristics, writing them on the board as a class brainstorm.
3. Describe digital versus analogue signals and compare storage reliability.
4. Name the main hardware components and assign each a function.
5. Set a device-classification task grouping twenty items by role.
6. Close with the exit question comparing digital and analogue signals.

Student activities

1. Open the system unit and identify the major components inside.
2. Recall the six characteristics and fill them in their own words.
3. State why digital signals are preferable for storage compared with analogue.
4. Name the main hardware components and give each a function in one sentence.
5. Classify twenty items by input, processing, output or storage role.
6. Answer the exit question in one sentence about digital versus analogue signals.

Practical / learning evidence

An exploded system-unit diagram with six main components labelled, a six-characteristics chart and a twenty-item classification table. Hand in all three for marking.

Resources and preparation

An actual desktop system unit opened safely, printed diagram templates and item cards. Offline route: printed diagrams and cards, no device needed. Supervise the removal of cables and keep tools out of learners' hands.

Assessment for learning

Inspect the diagram for six correct main components. Check the characteristics chart for six distinct entries. Mark the classification for accurate role assignment. Flag any learner who groups the CPU as only input.

Inclusion and homework

Provide the diagram prelabelled in the first six blanks for learners who need scaffolding. Allow oral completion of the classification. Extend confident learners with seventeen additional items and a seventeenth role category. Homework: name one digital signal application and one analogue signal application in daily life.