JSS 1 First Term

Lesson objectives

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

1. Define a computer as a device that accepts data, processes it under stored instructions, stores it and produces output.
2. State six characteristics of a computer, including speed, accuracy and lack of intelligence.
3. Name the main parts of a computer system and give the function of each.
4. Explain the roles of the ALU, control unit and registers inside the processor.
5. Trace the input, process, output and storage cycle for one everyday task.
6. Identify a computer system correctly from a mixed set of devices.

Key vocabulary

• Data: raw facts and figures with no meaning yet, such as a list of marks.
• Information: data that has been processed into a useful form, such as a learner's average score.
• CPU (processor): the part that carries out instructions.
• ALU: the arithmetic logic unit, which performs calculations and comparisons.
• Control unit: fetches instructions and directs the other parts in the correct order.
• Register: very fast temporary storage inside the processor.
• RAM: working memory that holds the programs and data in use. It loses its contents when power goes off.
• Motherboard: the main circuit board that connects the processor, memory and other components.
• Peripheral: a device connected to the system unit, such as a keyboard or printer.

Common misconceptions

• "The monitor is the computer." The monitor is an output device. The processing happens in the system unit.
• "The CPU and the system unit are the same thing." The system unit is the case. The CPU is one component inside it.
• "A computer is clever." A computer follows instructions exactly and has no understanding. Wrong input produces wrong output.

Teacher activities

1. Starter: show a photograph of a full desktop setup and ask learners to circle the computer in the image. Collect and discuss the different answers.
2. Define data, information and the input, process, output and storage cycle, using a familiar example such as computing a class average.
3. Open a system unit if one is available (or use a labelled diagram) and name the motherboard, CPU, RAM, power supply, drive and cooling fan.
4. Explain the CPU as the ALU, control unit and registers together, and model the fetch and execute idea with a simple routine: read the instruction, do it, store the result.
5. Set a matching task: part cards to function cards, then ask pairs to justify two matches.
6. Close with a "spot the computer system" set of images, including a phone, calculator, television and desktop.

Student activities

1. Circle their answer on the starter image and explain their choice.
2. Classify five given items as data or information.
3. Label a blank system-unit diagram using the word bank.
4. Write the function of six parts in one line each.
5. Trace the cycle for an ATM withdrawal, naming the input, processing, output and storage at each step.
6. Decide which images in the closing set are computer systems and give a reason.

Practical / learning evidence

A labelled diagram of a desktop computer system (at least eight labels with functions) and a completed four-column IPO table for two tasks: an ATM withdrawal and a school result calculation. Labels must be correct, legible and matched to the right part. A copied list of labels does not meet the criterion.

Resources and preparation

One working desktop or laptop, and if possible a non-working system unit that can be opened safely. Screwdriver, anti-static precautions, labelled diagram handout, word bank and part and function cards. Photographs of a phone, calculator, television and desktop. Offline route: printed diagram and cards. The real machine is optional. Never open a powered or plugged-in machine.

Assessment for learning

Check the diagram for correct placement and correct spelling. Ask three learners to explain one part without reading their notes. Mark the IPO tables for a sensible sequence. Learners who say the monitor is the computer need a concrete reteach using the opened unit.

Inclusion and homework

Give the word bank with the first letter of each part, and pair learners who struggle with writing at speed. Extend confident learners by asking what happens if RAM is too small for the program being opened. Homework: draw and label the computer setup you use at home or in the laboratory, and write one sentence on what each part does.