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The desktop computer power supply converts the alternating current (AC) from a wall socket of mains electricity to a low-voltage direct current (DC) to operate the motherboard, processor and peripheral devices. Several direct-current voltages are required, and they must be regulated with some accuracy to provide stable operation of the computer.
80 Plus (trademarked 80 PLUS) is a voluntary certification program launched in 2004, intended to promote efficient energy use in computer power supply units (PSUs). Certification is acquirable for products that have more than 80% energy efficiency at 20%, 50% and 100% of rated load, and a power factor of 0.9 or greater at 100% load.
SEAC (Standards Eastern Automatic Computer) demonstrated at US NBS in Washington, DC – was the first fully functional stored-program computer in the U.S. May 1950: UK The Pilot ACE computer, with 800 vacuum tubes, and mercury delay lines for its main memory, became operational on 10 May 1950 at the National Physical Laboratory near London.
The Pennsylvania State University (Penn State or PSU) is a public state-related land-grant research university with campuses and facilities throughout Pennsylvania, United States. Founded in 1855 as Farmers' High School of Pennsylvania , [ 13 ] Penn State was named the state's first land-grant university eight years later, in 1863.
For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85 percent efficient for loads above 180 W) may only be 73% efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Thus, for a 100 W load, losses for this ...
UMPC—Ultra-Mobile Personal Computer; UMTS—Universal Mobile Telecommunications System; UNC—Universal Naming Convention; UNIVAC—Universal Automatic Computer (By MKS) UPS—Uninterruptible Power Supply or Uninterrupted Power Supply; URI—Uniform Resource Identifier; URL—Uniform Resource Locator; URN—Uniform Resource Name; USB ...
Donald Trump has alleged there was jury misconduct in his New York hush money criminal trial. Prosecutors called it "unsworn, unsupported, hearsay."
A laptop's battery is charged using an external power supply, which is plugged into a wall outlet. The power supply outputs a DC voltage typically in the range of 7.2—24 volts. The power supply is usually external and connected to the laptop through a DC connector cable. In most cases, it can charge the battery and power the laptop ...