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linear motor. reluctance motor. alternating-current motor. induction motor. (Show more) electric motor, any of a class of devices that convert electrical energy to mechanical energy, usually by employing electromagnetic phenomena. Most electric motors develop their mechanical torque by the interaction of conductors carrying current in a ...
- Gordon R. Slemon
As the head of the government of the United States, the president is arguably the most powerful government official in the world. The president is elected to a four-year term via an electoral college system. Since the Twenty-second Amendment was adopted in 1951, the American presidency has been
- The Editors of Encyclopaedia Britannica
3 天前 · Statue of Liberty, colossal statue on Liberty Island in the Upper New York Bay, U.S., commemorating the friendship of the peoples of the United States and France.Standing 305 feet (93 metres) high including its pedestal, it represents a woman holding a torch in her raised right hand and a tablet bearing the adoption date of the Declaration of Independence (July 4, 1776) in her left.
2 天前 · Skyline of Toronto. The national capital is Ottawa, Canada’s fourth largest city. It lies some 250 miles (400 km) northeast of Toronto and 125 miles (200 km) west of Montreal, respectively Canada’s first and second cities in terms of population and economic, cultural, and educational importance. The third largest city is Vancouver, a centre ...
electric circuit, path for transmitting electric current. An electric circuit includes a device that gives energy to the charged particles constituting the current, such as a battery or a generator; devices that use current, such as lamps, electric motors, or computers; and the connecting wires or transmission lines. Two of the basic laws that ...
In the United States, commonwealth has continued to be the official description of four states (Kentucky, Massachusetts, Pennsylvania, and Virginia). It confers no distinction, other than in name, from the other states. The same term also was applied to Puerto Rico after an act of Congress of 1950 and adoption of the constitution of 1952.
4 Oliver and Richard Cromwell served as lords protector of England, Scotland, and Ireland during the republican Commonwealth. 5 William and Mary, as husband and wife, reigned jointly until Mary's death in 1694. William then reigned alone until his own death in 1702. 6 George IV was regent from February 5, 1811.
