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quadrant, in technology

(Encyclopedia) quadrant, in technology, angle-measuring device based on a scale of 90°. It is sometimes confused with the sextant, a similar instrument based on a scale of 60°. The quadrant is rarely…

Queenborough-in-Sheppey

(Encyclopedia) Queenborough-in-Sheppey, town (1991 pop. 33,362), on the Isle of Sheppey, Kent, SE England, at the confluence of the Medway and Thames rivers. Radios, furniture, glass, rubber products…

rhea, in zoology

(Encyclopedia) rhearhearēˈə [key], common name for a South American bird of the family Rheidae, which is related to the ostrich. Weighing from 44 to 55 lb (20–25 kg) and standing up to 60 in. (152 cm…

Rhea, in astronomy

(Encyclopedia) Rhea, in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn V (or S5), Rhea is 950 mi (1530 km) in diameter, orbits Saturn at a mean distance of…

resistance, in electricity

(Encyclopedia) resistance, property of an electric conductor by which it opposes a flow of electricity and dissipates electrical energy away from the circuit, usually as heat. Optimum resistance is…