power failure back-up system

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• Power system protection — is a branch of electrical power engineering that deals with the protection of electrical power systems from faults through the isolation of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the …   Wikipedia

• Power outage — A power outage (also known as power cut , power failure , power loss , or blackout ) is the loss of the electricity supply to an area.The reasons for a power failure can for instance be a defect in a power station, damage to a power line or other …   Wikipedia

• Power steering — helps drivers steer vehicles by augmenting steering effort of the steering wheel. It does this by adding controlled energy to the steering mechanism, so the driver needs to provide only modest effort regardless of conditions. In particular, power …   Wikipedia

• Power line communication — or power line carrier (PLC), also known as power line digital subscriber line (PDSL), mains communication, power line telecom (PLT), power line networking (PLN), or broadband over power lines (BPL) are systems for carrying data on a conductor… …   Wikipedia

• Back to the Future Part II — Theatrical release poster Directed by Robert Zemeckis Produced by …   Wikipedia

• System of Leibniz —     The System of Leibniz     † Catholic Encyclopedia ► The System of Leibniz     I. LIFE OF LEIBNIZ     Gottfried Wilhelm von Leibniz was born at Leipzig on 21 June (1 July), 1646. In 1661 he entered the University of Leipzig as a student of… …   Catholic encyclopedia

• Power supply unit (computer) — Power supply unit with top cover removed A power supply unit (PSU) supplies direct current (DC) power to the other components in a computer. It converts general purpose alternating current (AC) electric power from the mains (110 V to… …   Wikipedia

• Power supply — For the Budgie album, see Power Supply (album). A vacuum tube rackmount adjustable power supply, capable of +/ 1500 volts DC, 0 to 100mA output, with amperage limiting capability. A power supply is a device that supplies electrical energy …   Wikipedia

• Intermittent power source — [ Erie Shores Wind Farm monthly output over a two year period] An intermittent power source is a source of electric power generation that may be uncontrollably variable or more intermittent than conventional power sources, and therefore non… …   Wikipedia

• Nuclear power plant — This article is about electricity generation from nuclear power. For the general topic of nuclear power, see Nuclear power. A nuclear power station. The nuclear reactor is contained inside the cylindrical containment buildings to the right left… …   Wikipedia

• Uninterruptible power supply — A small free standing UPS …   Wikipedia