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Inductance — The phenomenon whereby the property of a circuit by which energy is stored in the form of an electromagnetic field. Induction heating — Heat produced in a conductor when eddy currents pass through it. Joule heating — Heat produced in a conductor when charges move through it, such as in resistors and wires.
Greek technology. Roman technology. Iranian technology. Ancient Egyptian technology describes devices and technologies invented or used in Ancient Egypt. The Egyptians invented and used many simple machines, such as the ramp and the lever, to aid construction processes. They used rope trusses to stiffen the beam of ships.
Young's Rudiments of an Egyptian Dictionary in the Ancient Enchorial Characterwas published posthumously in 1831. It included a full translation of one text and large portions of the text of the Rosetta Stone. According to the Egyptologist John Ray, Young "probably deserves to be known as the decipherer of demotic."
A crossword(or crossword puzzle) is a word gameconsisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to separate ...
For a chronological guide, see Timeline of electromagnetic theory. The history of electromagnetic theory begins with ancient measures to understand atmospheric electricity, in particular lightning. [ 1 ] People then had little understanding of electricity, and were unable to explain the phenomena. [ 2 ]
A rebus made up solely of letters (such as "CU" for "See you") is known as a gramogram, grammagram, or letteral word. This concept is sometimes extended to include numbers (as in "Q8" for "Kuwait", or "8" for "ate"). [3] Rebuses are sometimes used in crossword puzzles, with multiple letters or a symbol fitting into a single square.
According to ancient Egyptian creation myths, the god Atum created the world out of chaos, utilizing his own magic (ḥkꜣ). [1] Because the earth was created with magic, Egyptians believed that the world was imbued with magic and so was every living thing upon it. When humans were created, that magic took the form of the soul, an eternal ...
1675 – Robert Boyle discovers that electric attraction and repulsion can act across a vacuum and do not depend upon the air as a medium. Adds resin to the known list of "electrics". 1675 – Isaac Newton delivers his theory of light. 1676 – Ole Rømer proves that speed of light is finite, by observing Jupiter 's moons.