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Executive Departments

Find detailed information about each Executive Department, including the department's secretary, role in government, contact information, and history of the department…

Entertainment Bios — F

FabioNanette FabrayDouglas Fairbanks, Jr.FalcoPeter FalkChris FarleyElizabeth FarnsworthRichard FarnsworthPerry FarrellMia FarrowRalph FasanellaFastballFarrah FawcettFelaMarty FeldmanFederico…

Selected Biographies: F

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z More Biographies Don't see the biography you're looking for? Search 30,000+ biographies Biographies by…

DK Science & Technology: Electricity Supply

HOW ARE MOST GENERATORS POWERED? WHAT IS THE POWER GRID? WHAT IS ALTERNATING CURRENT? POWER GRID POWER STATIONSFIND OUT MOREElectricity has revolutionized the way we use energy. It can be generated…

DK Science: Electricity Supply

HOW ELECTRICITY DELIVERS ENERGYNETWORK CONTROL CENTRESOLAR POWERFIND OUT MOREElectricity comes to homes and workplaces through a huge network of power stations and cables. When the supply fails,…

People in Groups

Aristocracy: A society or group of people ruled by the upper class. Democracy: A form of government in which the people hold power. People can either exercise the power or elect officials to do so…

Algebra: Simplifying Radical Expressions

Simplifying Radical Expressions Algebra Wrestling with Radicals Introducing the Radical Sign Simplifying Radical Expressions Unleashing Radical Powers Radical Operations Solving Radical…

watt

(Encyclopedia) watt [for James Watt], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power. One watt is the…

DK Science: Energy Sources

ENERGY FROM THE SUNINSIDE A NUCLEAR POWER STATIONRENEWABLE ENERGYGEOTHERMAL ENERGYFIND OUT MOREEverything we do takes energy, which we get from many different sources. Most of the energy on Earth…

DK Science: Work

EFFICIENCYPOWERJOULESFIND OUT MOREScientists use the word work to describe the energy needed to do a task, by making a force move through a distance. The amount of work done is equal to the…