Describes the combined set of all letters in the alphabet and the numbers 0 through 9. It is useful to group letters and numbers together because many programs treat them identically, and differently from punctuation characters. For example, most operating systems allow you to use any letters or numbers in filenames but prohibit many punctuation characters. Your computermanual would express this rule by stating: “Filenames may be composed of alphanumeric characters.”
Sometimes additional characters are considered alphanumeric. For example, on IBM mainframesthe characters @, #, and $ are considered alphanumeric characters.
- ambient light
In digital photography terms, ambient light refers to the natural light in a scene that you are shooting.
The strength of a current of electricity expressed and measured in amperes.
An electronic device or electrical circuit that is used to boost (amplify) the power, voltage or current of an applied signal.
- amplifier repeater
A repeater that cannot distinguish between a data signal and transmission noise along a network. An amplifier repeater will receive the signal and amplify it regardless of the integrity of the signal.
(adj.) Also spelled analogue, describes a device or system that represents changing values as continuously variable physical quantities. A typical analog device is a clock in which the hands move continuously around the face. Such a clock is capable of indicating every possible time of day. In contrast, a digital clock is capable of representing […]