(Encyclopedia) thyristor, semiconductor switch used chiefly in power-control applications. Also called a silicon-controlled rectifier (SCR; see rectifier), it is a variation of the transistor. A…
Section 1[Legislative powers vested in Congress.] All legislative powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of…
HOLOGRAMLASER LIGHT SHOWFIND OUT MORESome beams of light are powerful enough to cut through metal. Others are precise enough to use for delicate surgery on people’s bodies. These remarkable…
Source: The U.S. Government Printing Office After winning its independence from Great Britain in the Revolutionary War, the new country situated on the eastern seaboard of North America needed to…
WIND TURBINEHOW AN ALTERNATOR WORKS 1HOW AN ALTERNATOR WORKS 2WIND FARMFIND OUT MOREGenerators convert energy from such sources as oil, gas, and wind into electrical energy. Like motors, they use…
WHAT MADE THE TRADERS SO PROSPEROUS? MINOANSPHOENICIANSFIND OUT MOREFrom around 2000 BC, people living close to the Mediterranean Sea, such as the MINOANS, Mycenaeans, and PHOENICIANS, built…
The framers of the Constitution sought to balance the rights of the several states and the powers of the new federal government. Their solution was a federal system, which divides powers between the…
(Encyclopedia) winch, mechanical device for hauling or lifting consisting essentially of a movable drum around which a cable is wound so that rotation of the drum produces a drawing force at the end…
(Encyclopedia) Niagara Falls, in the Niagara River, W N.Y. and S Ont., Canada; one of the most famous spectacles in North America. The falls are on the international line between the cities of…
