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Unformatted text preview: Jelena Mamenko Operating Systems Lecture Notes on Operating Systems 15 Electrical power supplies A "wall wart" style variable DC power supply with its cover removed. Simpler AC supplies have nothing inside the case except the transformer. This term covers the mains power distribution system together with any other primary or secondary sources of energy such as: Conversion of one form of electrical power to another desired form and voltage. This typically involves converting 120 or 240 volt AC supplied by a utility company (see electricity generation) to a well-regulated lower voltage DC for electronic devices. For examples, see switched-mode power supply, linear regulator, rectifier and inverter (electrical). Batteries Chemical fuel cells and other forms of energy storage systems Solar power Generators or alternators (particularly useful in vehicles of all shapes and sizes, where the engine has rotational power to spare, or in semi-portable units containing an internal combustion...
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- Spring '09
- Operating Systems