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wave, in physics
(Encyclopedia)wave, in physics, the transfer of energy by the regular vibration, or oscillatory motion, either of some material medium or by the variation in magnitude of the field vectors of an electromagnetic fie...arc, in electricity
(Encyclopedia)arc, in electricity, highly luminous and intensely hot discharge of electricity between two electrodes. The arc was discovered early in the 19th cent. by the English scientist Sir Humphry Davy, who so...Muybridge, Eadweard
(Encyclopedia)Muybridge, Eadweard ĕdˈwərd mīˈbrĭj [key], 1830–1904, English-born photographer and student of animal locomotion. Muybridge changed his name from Edward James Muggeridge. A gifted and obsessed...McCarthy, Joseph Raymond
(Encyclopedia)McCarthy, Joseph Raymond, 1908–57, U.S. senator from Wisconsin (1947–57), b. near Appleton, Wis. He practiced law in Wisconsin and became (1940) a circuit judge. He served with the U.S. marines in...lightning rod
(Encyclopedia)lightning rod, a rod made of materials, especially metals, that are good conductors of electricity, which is mounted on top of a building or other structure and attached to the ground by a cable. By v...shaft sinking
(Encyclopedia)shaft sinking, excavation from the surface of an opening in the earth. Shafts, which are generally vertical, are usually distinguished from tunnels, which are horizontal. Little difficulty is experien...quantum theory
(Encyclopedia)quantum theory, modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity togethe...bias, in electricity
(Encyclopedia)bias, a voltage, current, or other input applied to a device or system as a reference or to set its conditions of operation. A bias is usually steady but may vary with time, usually within a fixed and...cell, in electricity
(Encyclopedia)cell: see battery, electric.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 provided by a con...Browse by Subject
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