131978
| Question | Answer |
| Bit | A single binary digit: 1 or 0 |
| Byte | 8 bits |
| Nibble | 4 bits |
| Kilobyte | 1024 bytes / 2 |
| Megabyte | 1024 kilobyte / 22⃣0⃣ bytes |
| Gigabyte | 1024 megabytes / 23⃣0⃣ bytes |
| Terabyte | 1024 gigabytes / 2 4⃣0⃣ bytes |
| Binary | Base 2 number system, used by computers, uses the digits 1 & 0 only |
| Deanery | Base 10 number system, how we normally count, uses digits 0 to 9 |
| Hexadecimal ( hex) | Base 16 number systemised by humans to represent groups of four bits at a time. Uses digits 0 to F |
| Overflow | When the result of a numeric calculation is too large to be stored in the space reserved for that type of data. |
| Character set | The set of symbols that can be represented by a computer. The symbols are called characters and can be letters, digits l, space, punctuation marks and some control characters such as "escape". Each character is represented by a numerical code that is stored as a binary integer. |
| ASCII | American standard code for information interchange: a 7- bit character set used by PC's.(there is also an extended ASII character set that uses 8 bits.) |
| EBCDIC (or. Eb-Sid- ic) | Extended binary coded decimal interchange code: an 8 bit character set used by old mainframes. |
| Unicode | A 16- bit character set that allows many more characters to be coded. |
| Bitmap image | An image that had been stored as a series of values per pixel. The colour of each individual pixel is stored in a file. |
| Pixel | Short for picture element. It is the smallest component of a bit- mapped image. |
| Colour depth | The number of bits used to represent the colour of a single pixel in a bit mapped image. Higher colour depth gives a broader range of distinct colours. For example, an image stored as a .gif file used 8 bits per pixel so the image could use 256 different colours. |
| Resolution | The number of pixels in a image expressed as: the-number-of-pixels-down eg: 400 * 600. |
| Metadata | Data about data. In the case of image files metadata is the data the computer needs to interpret the image data in the file, for example: resolution, colour, depth and image dimensions. |
| Analogue | A continuously changing wave such as natural sound. |
| Digital | Data that is made up of separate values. How data is stored on a computer. |
| Sample rate | The number of times per second that the sound wave is measured. The higher the rate the more accurately the sound wave is represented. |
| Sample interval | The time gap between measurements of the sound wave being taken. Another way of expressing the sampling rate. |
| Sample resolution | The number of bits used to store the value of each sample. The higher the number of bits the more accurately the value is stored. |
| ADC | Analogue to digital converter: takes real- world analogue data and converts it to a binary representation that can be stored on a computer. |
| Data | Facts and figures with no context or formation to give them meaning. |
| Information | Processed data that has context and format so that it conveys meaning. |
| Instruction set | The group of instructions available for that specific processor to use. The number of instructions available will depend on the number of bits used. For example, with 4 bits there could potentially be 15 different instructions. |
| Op code | The group of bits in an instruction that represents the operation such as EAT, MOVE or TURN. |
| Compiler | A piece of system software that converts a program written in a high level programming language into machine code (binary). |
| Machine code | A binary representation of a program. |
| High level programming language | A programming language written in constructs using language we can can understand. Language include Delphi, Visual Basic, Java and C++. |
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