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The system power consumption is a sum of the power ratings for all of the components of the computer system that draw on the power supply. Some graphics cards (especially multiple cards) and large groups of hard drives can place very heavy demands on the 12 V lines of the PSU, and for these loads, the PSU's 12 V rating is crucial.
Power supplies are categorized in various ways, including by functional features. For example, a regulated power supply is one that maintains constant output voltage or current despite variations in load current or input voltage.
D.C. variable bench power supply unit, with a digital display showing current (left) and voltage (right), and three banana connectors (+, ground, -).Other power supplies may use the opposite order for indicators and connectors, and two different colours for the indicators.
The power distribution specification defined that most of the PSU's power should be provided on 5 V and 3.3 V rails, because most of the electronic components (CPU, RAM, chipset, PCI, AGP and ISA cards) used 5 V or 3.3 V for power supply. The 12 V rail was only used by computer fans and motors of peripheral devices (HDD, FDD, CD-ROM, etc.)
The Pennsylvania State University is a geographically dispersed university with campuses located throughout the Commonwealth of Pennsylvania.While the administrative hub of the university is located at its flagship campus, University Park, the 19 additional commonwealth campuses together enroll 37 percent of Penn State's undergraduate student population.
Penn State University Park is also served by the Penn State University Ambulance Service, known as Centre County Company 20. Penn State EMS is a full-service, licensed ambulance service, staffed by student EMTs. The ambulance is staffed around the clock, with the exception of the school's annual winter break, when it goes out of service.
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Stand-alone switched-mode power supply An adjustable switched-mode power supply for laboratory use. A switched-mode power supply (SMPS), also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.