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videocassette recorder
(Encyclopedia) videocassette recorder (VCR), device that can record television programs or the images from a video camera on magnetic tape (see tape recorder); it can also play prerecorded tapes. A…switch
(Encyclopedia) switch, electrical device having two states: on, or closed; and off, or open. Ideally a switch offers a zero impedance to a current when it is closed, and it offers infinite impedance…Estimate Quotients With 2-Digit Divisors
In this video, Jada learns about estimation, and how to estimate the solutions to division problems.Models to Subtract 2-Digit Numbers
In this video, Marta learns various ways to subtract 2-digit numbers from 2-digit numbers, including regrouping and marking out.Turing, Alan Mathison
(Encyclopedia) Turing, Alan Mathison, 1912–54, British mathematician and computer theorist. While studying at Cambridge he began work in predicate logic that led to a proof (1937) that some…Shannon, Claude Elwood
(Encyclopedia) Shannon, Claude Elwood, 1916–2001, American applied mathematician, b. Gaylord, Michigan. A student of Vannevar Bush at the Massachusetts Institute of Technology (MIT), he was the first…watch
(Encyclopedia) watch, small, portable timepiece usually designed to be worn on the person. Other kinds of timepieces are generally referred to as clocks. At one time it was generally believed that…sound recording
(Encyclopedia) sound recording, process of converting the acoustic energy of sound into some form in which it can be permanently stored and reproduced at any time. In 1855 the inventor Leon Scott…ammeter
(Encyclopedia) ammeterammeterămˈmēˌtər [key], instrument used to measure the magnitude of an electric current of several amperes or more. An ammeter is usually combined with a voltmeter and an…personal digital assistant
(Encyclopedia) personal digital assistant (PDA), lightweight, hand-held computer designed for use as a personal organizer with communications capabilities; also called a handheld. A typical PDA has…Trending
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