Starter quiz
- How many bits are there in a byte?
- '8' ✓
- What is the smallest unit of data in a computer?
- 'bit' ✓
- Arrange the following in order of increasing bits:
- 1⇔bit
- 2⇔byte
- 3⇔kilobyte
- What is the purpose of binary sequences in computers?
- to represent text only
- to represent images only
- to represent audio only
- to represent all data and instructions that computers process ✓
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- What is the next binary number after 111?
- '1000' ✓
- What is the binary equivalent of the decimal number 10?
- '1010' ✓
Exit quiz
- Match the following terms to their definitions.
- ASCII⇔a method of character representation using 8 bits ✓
- Unicode⇔a method of character representation using up to 32 bits ✓
- character set⇔a record of characters, each matched to a unique binary sequence ✓
- bit⇔smallest unit of data ✓
- byte⇔8 bits together ✓
- How many different values can be represented by a 3-bit binary number?
- '8' ✓
- If the ASCII value of 'A' is 65 in decimal, what is the ASCII value of 'C' in decimal?
- '67' ✓
- Why might we need more than just ASCII for character representation?
- to only represent English characters
- to simplify binary sequences
- to support other symbols beyond written text ✓
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- How does Unicode differ from ASCII?
- Unicode uses more bits for character representation. ✓
- Unicode is only for English characters.
- ASCII uses more bits than Unicode.
- They are identical.
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- What is the relationship between ASCII and Unicode?
- They are completely different.
- The first 256 characters of Unicode are the same as in ASCII. ✓
- Unicode does not include any ASCII characters.
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Worksheet
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Lesson Details
Key learning points
- The number of possible states of a sequence of n bits is 2 raised to the power of n.
- A character set is a record of characters, each matched to a unique binary sequence.
- ASCII character representation uses an 8-bit binary sequence to represent each character.
- Unicode character representation uses up to 32 bits to represent each character.
- The first 256 characters of Unicode are the same as in ASCII.
Common misconception
ASCII and Unicode are only used to represent the characters and symbols found in written communication across all languages in the world.
ASCII and Unicode include more than just characters from written languages. ASCII represents English letters, numbers and symbols. Unicode supports other symbols beyond written text, including mathematical symbols, emojis and non-text elements.
Keywords
State - value of data at a specific point in time
Character set - a system that matches characters to a unique binary sequence
Ascii - a method of character representation that uses 8 bits per character
Unicode - a method of character representation that uses up to 32 bits per character
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