A-Level Computer Science - AQA 2023 Flashcard

A-Level Computer Science - AQA 2023 Flashcard Laser Printer - -answer-A type of printer that uses electrical charges to create an image on paper. The printer drum and the toner are negatively charged, and the charge on the drum is neutralised in certain areas with a laser, making the toner stick to the drum in these places. The paper passes over the drum and the toner is transferred with the help of a positively charged roller, and the toner is then fused with the paper using heat. Colour printers repeat this process over four drums, one for each toner colour. Hard Drives - -answer-A non-volatile, magnetic form of internal or external storage, that permanently stores and retrieves data on a computer Solid State Drive (SSD) - -answer-Secondary storage consisting of many transistors that store a bit of data in the form of electrical charge, even when unpowered. As data is stored electronically, there are no moving parts. Optical Disk - -answer-A form of secondary storage that uses light emitted by a laser to read and write onto a disk. Encapsulation - -answer-Combining attributes and methods together into an object Normalisation - -answer-The process of decomposing a flat-file into the best possible design for a relational database, making it less likely to lose data, create inconsistencies, or create redundant data Encryption - -answer-Using an algorithm to change data so that it can only be read by the intended recipient Cipher - -answer-The algorithm which is used to encrypt or decrypt data Symmetric Encryption - -answer-The same key is used to both encrypt and decrypt the data