11367427
Description
Flashcards by Max Rafter, updated more than 1 year ago
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Created by Max Rafter
about 7 years ago
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| Question | Answer |
| RAM and ROM | RAM = Random access memory ROM = Read only memory ROM- contains all the data required to boot up the computer. This data is non volatile meaning it doesn't loose it when the PC is turned off. RAM-Fast, temporary, type of memory in which programs and data are stored. When the PC is turned off ram is lost (Volatile). |
| LAN vs WAN | LAN=Local area network WAN=wide area network LAN-A LAN is used to cover a small area such as one site or building, for example a school or a college. |
| Storage | Optical=is the storage of data on an optically readable medium. eg DVD or CD. Solid state (SSS) =A type of storage with no moving parts, this makes the transfer of data very fast. Magnetic = Slower than SSS however normally stores a lot more and uses magnetic dots to function |
| Clock Speed | Clock Speed-Also known as clock rate, indicates how fast the CPU can run. This is measured in gigahertz (GHz) this represents how many instruction cycles (FED cycle) ,the CPU can deal with in a second. For example a 2 GHz CPU performs two billion cycles a second. |
| File Measurements | Bit = 1 bit Nibble = 4 bits Byte = 8 bits Kilobyte = 1024 bytes Megabyte = 1024 kilobytes Gigabyte = 1024 megabytes Terabyte = 1024 gigabytes |
| Sound Files | The analogue sound is converted to digital sound. To record the sound, snapshots are took of the data. These are called sample rates, the more sample rates, the higher the sound quality. This increases the file size, this means the file needs to be compressed via lossless compression. The sound is stored in binary. |
| Lossy and Lossless | Compression can be lossy or lossless. Lossless compression is when the file size is compressed and the quality of it remains the same. Lossy compression permanently removes data |
| Arrays | An array is a data structure consisting of a collection of elements (values or variables), each identified by at least one array index or key. An array is stored so that the position of each element can be computed from its index tuple by a mathematical formula. |
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