9618 AS Level Computer Science | Unit 3 Lesson 3: Primary Memory | SRAM & DRAM | Static & Dynamic

📌 9618 AS Level Computer Science – Unit 3 Lesson 3: SRAM vs DRAM

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In this lesson, we continue Unit 3: Hardware by exploring two important types of RAM: SRAM (Static RAM) and DRAM (Dynamic RAM).

Both SRAM and DRAM are forms of primary memory used by the CPU, but they differ significantly in terms of speed, cost, structure, and usage. SRAM is faster and more reliable but expensive, making it ideal for cache memory. DRAM, on the other hand, is slower and needs constant refreshing, but it is cheaper and used as the main system memory. Understanding these differences is essential for exam questions and real-world applications.

🎥 Lesson Breakdown:

0:00 – Introduction
0:50 – Recap: What is Primary Storage
1:00 – What is SRAM? (features: static, no refreshing, faster, more expensive)
1:40 – What is DRAM? (features: dynamic, needs refreshing, slower, cheaper)
2:30 – Key differences between SRAM and DRAM

📚 Perfect for:

✔️ Students studying Cambridge 9618 AS Level Computer Science
✔️ Learners who want a clear explanation of SRAM vs DRAM
✔️ Teachers looking for structured, syllabus-aligned lessons

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