SS 1 First Term

LEARNING OBJECTIVES: BY THE END OF THE LESSON STUDENTS SHOULD BE ABLE TO:

Cognitive	i. Describe main memory, including RAM, ROM and cache. ii. Identify secondary storage devices. iii. Distinguish between memory and storage. iv. Explain the memory hierarchy and the units of capacity.
Affective	i. Appreciate the value of Storage and Memory in school, at home and in the community. ii. Show willingness to use digital tools carefully, safely and responsibly.
Psychomotor	i. Draw a table comparing RAM and ROM. ii. List three secondary storage devices and one use of each. iii. Explain why memory is called temporary storage. iv. Write the units of capacity from the bit upwards.

Rationale: Main memory is the working space of the computer, made up of chips the CPU can address directly. Understanding main Memory (RAM, ROM, and Cache), secondary Storage Devices, memory vs Storage and Capacity Units, memory Hierarchy helps learners use digital technology confidently, safely and responsibly.

Pre-requisite Knowledge: In Week 5, learners studied Output Devices, including monitors and Soft Copy, printers, Speakers, and Projectors, plotters and Choosing the Right Output Device. The knowledge from that week is used again in this lesson.

Learning Material/Teaching Aid: Whiteboard, markers, computer or laptop where available, printed notes and charts on Storage and Memory, practical task sheets, learners' notebooks and pens.

Reference Materials: Digital Technology for Senior Secondary Schools (SS 1); NERDC Digital Technology Curriculum; Digital Technology SS 1 First Term Notes (Week 6); First Term examination and Continuous Assessment question papers.

LESSON DEVELOPMENT

Stage/Step (Time)	Teacher's Activities	Student's Activities	Learning Points
Introduction 5 MINUTES	Welcomes learners, revises Week 5 (Output Devices) with two quick oral questions, and asks what they already know about Storage and Memory. Elicits responses and writes the topic on the board.	Recall the previous lesson and share what they already know about Storage and Memory.	Connecting prior knowledge to Storage and Memory.
Step 1 6 MINUTES	Covers Main Memory (RAM, ROM, and Cache): Main memory is the working space of the computer, made up of chips the CPU can address directly. It exists in two main forms, RAM (Random Access Memory) and ROM (Read Only Memory). Covers Secondary Storage Devices: Secondary storage holds data and programs permanently, even when power is off. It is non-volatile.	Listen, take notes and answer oral questions on "Main Memory (RAM, ROM, and Cache)" and related points.	Understanding: Main Memory (RAM, ROM, and Cache); Secondary Storage Devices.
Step 2 6 MINUTES	Covers Memory vs Storage and Capacity Units: Memory and storage are often confused, but they serve different purposes. Memory (RAM) holds data temporarily while the computer is running. Covers Memory Hierarchy: A computer stores and moves data at different speeds and costs. The memory hierarchy organises storage from fastest and smallest at the top to slowest and largest at the bottom.	Copy the key points, give examples from school and everyday life, and ask questions on "Memory vs Storage and Capacity Units" and related points.	Understanding: Memory vs Storage and Capacity Units; Memory Hierarchy.
Step 3 6 MINUTES	Covers RAM versus ROM: RAM and ROM are both main memory but behave very differently. RAM (Random Access Memory) is volatile and read-write: it holds running programs and open files, and loses all data when the computer is switched off.	Discuss in pairs, then report one point on "RAM versus ROM" to the class.	Understanding: RAM versus ROM.
Step 4 6 MINUTES	Covers Cache Memory Levels: Modern processors use three levels of cache: L1, L2 and L3. L1 is the smallest and fastest, built into each core. L2 is larger and slightly slower, dedicated to each core.	Respond to questions, complete the examples on the board and note down "Cache Memory Levels".	Understanding: Cache Memory Levels.
Practical Work 6 MINUTES	Guides learners through the practical work: (i) Draw a table comparing RAM and ROM. (ii) List three secondary storage devices and one use of each. (iii) Explain why memory is called temporary storage. Moves round the class to check progress and correct unsafe or careless use.	Carry out the practical tasks individually or in pairs and record what they did in their notebooks.	Applying the lesson through hands-on practice.
Evaluation 3 MINUTES	Asks learners to: i. Describe main memory, including RAM, ROM and cache. ii. Identify secondary storage devices. iii. Distinguish between memory and storage. iv. Explain the memory hierarchy and the units of capacity.	Respond verbally and in writing to the evaluation questions.	Assessment and consolidation of the lesson content.
Conclusion 2 MINUTES	Recaps the main points: main Memory (RAM, ROM, and Cache), secondary Storage Devices, memory vs Storage and Capacity Units, memory Hierarchy, rAM versus ROM. Links them to the assignment and previews Week 7: Computer Software.	Listen, ask questions and copy the assignment.	Reinforcement of key concepts and a preview of the next lesson.

Assignment: i. (a) Differentiate clearly between Primary Memory and Secondary Storage, comparing RAM and ROM. (b) Perform the following storage scale conversions, showing all intermediate steps: (i) Convert 3 Gigabytes (GB) into Megabytes (MB). (ii) Convert 512 Bits into Bytes. (iii) Arrange the following storage capacities in descending order: 2 TB, 2,048 MB, 500 KB, 4,096 Bytes. ii. A student buys a laptop advertised as 8 GB RAM and 256 GB SSD. Explain what each figure means, which is volatile and which is non-volatile, and why the laptop needs both to work.