Power supplyA power supply is an electrical device that supplies electric power to an electrical load. The main purpose of a power supply is to convert electric current from a source to the correct voltage, current, and frequency to power the load. As a result, power supplies are sometimes referred to as electric power converters. Some power supplies are separate standalone pieces of equipment, while others are built into the load appliances that they power. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.
Voltage regulatorA voltage regulator is a system designed to automatically maintain a constant voltage. A voltage regulator may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages. Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elements.
Voltage dropIn electronics, voltage drop is the decrease of electric potential along the path of a current flowing in a circuit. Voltage drops in the internal resistance of the source, across conductors, across contacts, and across connectors are undesirable because some of the energy supplied is dissipated. The voltage drop across the load is proportional to the power available to be converted in that load to some other useful form of energy. For example, an electric space heater may have a resistance of ten ohms, and the wires that supply it may have a resistance of 0.
Voltage sourceA voltage source is a two-terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current. However, a real-world voltage source cannot supply unlimited current. A voltage source is the dual of a current source. Real-world sources of electrical energy, such as batteries and generators, can be modeled for analysis purposes as a combination of an ideal voltage source and additional combinations of impedance elements.
Voltage dividerIn electronics, a voltage divider (also known as a potential divider) is a passive linear circuit that produces an output voltage (Vout) that is a fraction of its input voltage (Vin). Voltage division is the result of distributing the input voltage among the components of the divider. A simple example of a voltage divider is two resistors connected in series, with the input voltage applied across the resistor pair and the output voltage emerging from the connection between them.
Uninterruptible power supplyAn uninterruptible power supply (UPS) or uninterruptible power source is a type of continual power system that provides automated backup electric power to a load when the input power source or mains power fails. A UPS differs from a traditional auxiliary/emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions by switching to energy stored in battery packs, supercapacitors or flywheels.
Switched-mode power supplyA switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power, see AC adapter) to DC loads, such as a personal computer, while converting voltage and current characteristics.
Power supply unit (computer)A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies. Some power supplies have a manual switch for selecting input voltage, while others automatically adapt to the main voltage. Most modern desktop personal computer power supplies conform to the ATX specification, which includes form factor and voltage tolerances.
Voltage regulator moduleA voltage regulator module (VRM), sometimes called processor power module (PPM), is a buck converter that provides microprocessor and chipset the appropriate supply voltage, converting +3.3 V, +5 V or +12 V to lower voltages required by the devices, allowing devices with different supply voltages be mounted on the same motherboard. On personal computer (PC) systems, the VRM is typically made up of power MOSFET devices. Most voltage regulator module implementations are soldered onto the motherboard.
The Chalice and the BladeThe Chalice and The Blade: Our History, Our Future is a 1987 book by Riane Eisler. The author presents a conceptual framework for studying social systems with particular attention to how a society constructs roles and relations between the female and male halves of humanity. Eisler highlights the tension between what she calls the dominator or domination model and the more naturally feminine partnership model. Eisler proposes tension between these two underlies the span of human cultural evolution.
Michael Smith (newspaper reporter)Michael Smith (born 1952) is a British author who specializes in spies and espionage. He is also a former member of the board of the Bletchley Park Trust. Smith is a former soldier and journalist best known for obtaining and publishing the documents collectively known as The Downing Street Memos. The Downing Street memo itself was an official record of a meeting of the British war cabinet held in July 2002. It revealed the disclosure by Sir Richard Dearlove, then the head of the British Secret Intelligence Service (MI6), that the intelligence to justify an invasion was being "fixed around the policy".
Post-processual archaeologyPost-processual archaeology, which is sometimes alternately referred to as the interpretative archaeologies by its adherents, is a movement in archaeological theory that emphasizes the subjectivity of archaeological interpretations. Despite having a vague series of similarities, post-processualism consists of "very diverse strands of thought coalesced into a loose cluster of traditions". Within the post-processualist movement, a wide variety of theoretical viewpoints have been embraced, including structuralism and Neo-Marxism, as have a variety of different archaeological techniques, such as phenomenology.
The Affair at the Semiramis HotelThe Affair at the Semiramis Hotel is a 1917 detective novella by the British writer A. E. W. Mason featuring his character Inspector Hanaud. Mason had originally written many of the plot elements for an abortive silent film, to be called The Carnival Ball. The novella appeared between Mason's first full-length Hanaud novel, At the Villa Rose (1910), and his second, The House of the Arrow (1934). The story is set in London, after the events described in At the Villa Rose.
Ted DewanTed Dewan is an American-born British writer and illustrator of children's books who resides in England. He is best known as the creator of the award-winning book series, Bing, now adapted into an animated television series. Dewan was born in Boston and raised in Lexington, Massachusetts, the first son of physicist Dr Edmond M Dewan and scholar/attorney Karen Dean-Smith. He grew up with his brother, musician and artist Brian Dewan and both brothers had musical and artistic aspirations from a young age.
AC adapterAn AC adapter or AC/DC adapter is a type of external power supply, often enclosed in a case similar to an AC plug. Other common names include wall wart, power brick, wall charger, and power adapter. Adapters for battery-powered equipment may be described as chargers or rechargers (see also battery charger). AC adapters are used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power.
Peter ChurchillPeter Morland Churchill, (14 January 1909 – 1 May 1972) was a British Special Operations Executive (SOE) officer in France during the Second World War. His wartime operations, which resulted in his capture and imprisonment in German concentration camps, and his subsequent marriage to fellow SOE officer, Odette Sansom, received considerable attention during the war and after, including a 1950 film. Churchill's father was William Algernon Churchill (1865–1947), a British Consul who served in Mozambique, Amsterdam, Pará in Brazil, Stockholm, Milan, Palermo, and Algiers.
Jerez de la FronteraJerez de la Frontera (xeˈɾeθ ðe la fɾonˈteɾa), or simply Jerez (xeˈɾeθ), is a city and municipality in the province of Cádiz in the autonomous community of Andalusia, in southwestern Spain. It is located in Campiña de Jerez, midway between the Atlantic Ocean and the Cádiz Mountains. with 213,105 inhabitants, Jerez is the 25th largest city in Spain, the fifth largest in Andalusia and the largest in the Province of Cádiz. Its municipality covers an area of and includes the Los Alcornocales Natural Park.
Erich Neumann (psychologist)Erich Neumann (אריך נוימן; 23 January 1905 – 5 November 1960) was a German psychologist, philosopher, writer, and student of Carl Jung. Neumann was born in Berlin to a Jewish family. He received his PhD in Philosophy from the University of Erlangen–Nuremberg in 1927 and then continued to study medicine at the University of Berlin, where he acquired his first degree in medicine in 1933. In 1934 Neumann and his wife Julie, who had been Zionists since they were teenagers, spurred on by fear of persecution of Jews by the Nazi government, moved to Tel Aviv.
Norman Blake (academic)Norman Francis Blake (19 April 1934 – 29 July 2012) was a British academic and scholar specialising in Middle English and Early Modern English language and literature on which he published abundantly during his career. Norman Blake was born in Ceará, Brazil, where his English father worked as a banker at the Bank of London and South America. His mother was half-Brazilian and half-German. In 1938, when he was four years old, he was sent to boarding school in Surrey and then to Magdalen College School in Brackley, Northamptonshire, in 1944.
Electric motorAn electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.
