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Learn: Units of Data
OCR GCSE J277 Computer Science specification
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Welcome!Today we'll learn about units of data. This topic is all about understanding how data is measured and stored in computers.
What are Units of Data?Units of data describe how information is measured and represented in computers. Data is stored as binary values using 1s and 0s. These units help us understand the amount of data stored or transferred.
Data UnitsComputers store data in small chunks, starting with the bit. Larger units include nibble, byte, and so on. Each unit represents a specific amount of binary data.
Definitions of Key UnitsBit: The smallest unit of data, representing a binary value (1 or 0).Nibble: 4 bits grouped together.Byte: 8 bits, commonly used to represent a single character.Kilobyte (KB): 1,000 bytes.Megabyte (MB): 1,000 KB.Gigabyte (GB): 1,000 MB.Terabyte (TB): 1,000 GB.
Quick check: How many bits are in a byte?
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Why Use Binary?Computers use binary because it is simple for electronic circuits to represent two states: on (1) and off (0). This helps process and store data efficiently.
A {{blank0}} is made up of {{blank1}} bits.
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Converting Between UnitsData can be converted between units. For example, 1 kilobyte (KB) equals 1,000 bytes, and 1 megabyte (MB) equals 1,000 kilobytes.
Match the items on the left with their correct pairs on the right
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Review Time!Great work! You've learned about units of data, binary, and conversions. Let's test your understanding with a few questions.
Which of the following are valid data units? (Select all that apply)
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Match the items on the left with their correct pairs on the right
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What is the smallest unit of data?
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Well done! You've completed the lesson on units of data. Keep practising these concepts to reinforce your learning!
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