[ Page 35] explain the term character set • [ Pages 4 & 5] describe with examples (for • example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented 9 * IMAGES explain the representation of an • [ Book Page 16] image as a series of pixels [ Pages 36 & 37] represented in binary [ Pages 1-3] explain the need for metadata • to be included in the file such as height, width and colour depth discuss the effect of colour • depth and resolution on the size of an image file 10 * SOUND explain how can be • [ Book Page 17] sampled and stored in digital form [ Page 38] explain how sampling intervals • [ Pages 1-4] and other considerations affect the size of a sound file and the quality of its playback 11 * INSTRUCTIONS explain how instructions are • [ Book Page 18] coded as bit patterns [ Page 39] explain how the computer • [ 1-3] distinguishes between instructions and data 12 THE CENTRAL state the purpose of the CPU • PROCESSING UNIT describe the function of the CPU • (CPU) as fetching and executing [ Book Pages 23 & 25] instructions stored in memory [ Pages 7-11,20] describe cache memory • [ Pages 1-3] explain how common • [ Page 5] characteristics of CPUs such as clock speed, cache size and number of cores affect their performance 13 MEMORY describe the difference between • [ Book Pages 25-28] RAM and ROM [ Pages 15-21] explain the need for ROM in a • [ Pages 6-9] computer system describe the purpose of RAM in • a computer system explain how the amount of RAM • in a personal computer affects the performance of the computer explain the need for virtual • memory discuss how changes in memory • technologies are leading to innovative computer designs
[ Page 35] [ Pages 4 & 5] • explain the term character set • describe with examples (for example ASCII and Unicode) the relationship between the number of bits per character in a character set and the number of characters which can be represented 9 * IMAGES [ Book Page 16] [ Pages 36 & 37] [ Pages 1-3] • explain the representation of an image as a series of pixels represented in binary • explain the need for metadata to be included in the file such as height, width and colour depth • discuss the effect of colour depth and resolution on the size of an image file 10 * SOUND [ Book Page 17] [ Page 38] [ Pages 1-4] • explain how can be sampled and stored in digital form • explain how sampling intervals and other considerations affect the size of a sound file and the quality of its playback 11 * INSTRUCTIONS [ Book Page 18] [ Page 39] [ 1-3] • explain how instructions are coded as bit patterns • explain how the computer distinguishes between instructions and data 12 THE CENTRAL PROCESSING UNIT (CPU) [ Book Pages 23 & 25] [ Pages 7-11,20] [ Pages 1-3] [ Page 5] • state the purpose of the CPU • describe the function of the CPU as fetching and executing instructions stored in memory • describe cache memory • explain how common characteristics of CPUs such as clock speed, cache size and number of cores affect their performance 13 MEMORY [ Book Pages 25-28] [ Pages 15-21] [ Pages 6-9] • describe the difference between RAM and ROM • explain the need for ROM in a computer system • describe the purpose of RAM in a computer system • explain how the amount of RAM in a personal computer affects the performance of the computer • explain the need for virtual memory • discuss how changes in memory technologies are leading to innovative computer designs
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