Character Set Comparison
Part of Character Sets · GCSE GCSE Computer Science revision
This comparison covers Character Set Comparison within Character Sets for GCSE Computer Science. Revise Character Sets in 3.3 Data Representation for GCSE Computer Science with 15 exam-style questions and 18 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 7 of 11 in this topic. Use this comparison to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 7 of 11
Practice
15 questions
Recall
18 flashcards
Character Set Comparison
| Set | Size | Bytes/Char | Coverage | Use Case |
|---|---|---|---|---|
| ASCII | 128 chars | 1 byte | English only | Legacy systems, simple text |
| Extended ASCII | 256 chars | 1 byte | Western Europe | Legacy, regional documents |
| Unicode (UTF-8) | 143,859 chars | 1-4 bytes | All languages | Web, modern apps, files |
| Unicode (UTF-16) | 143,859 chars | 2-4 bytes | All languages | Windows, Java internals |
| Unicode (UTF-32) | 143,859 chars | 4 bytes | All languages | Internal processing |
Keep building this topic
Read this section alongside the surrounding pages in Character Sets. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Character Sets
How many bits does standard ASCII use to represent each character?
Explain why using Unicode to store a text file produces a larger file than using ASCII to store the same text.
Quick Recall Flashcards
15 questions on Character Sets — practise free
Instant marking, adaptive difficulty, and 18 spaced repetition flashcards. Free until your GCSEs.
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