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A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. [ 1 ] [ clarification needed ] Small whirlpools form when a bath or a sink is draining. More powerful ones formed in seas or oceans may be called maelstroms ( / ˈ m eɪ l s t r ɒ m , - r ə m / MAYL -strom, -strəm ).
The following other wikis use this file: Usage on ar.wikipedia.org هويرلبول; Usage on azb.wikipedia.org ویرلپول; Usage on bg.wikipedia.org
An induction coil consists of two coils of insulated wire wound around a common iron core (M). [1] [7] One coil, called the primary winding (P), is made from relatively few (tens or hundreds) turns of coarse wire. [7] The other coil, the secondary winding, (S) typically consists of up to a million turns of fine wire (up to 40 gauge). [8] [1] [7]
The coil changes the linear movement of the metal expansion into a circular movement thanks to the helicoidal shape it draws. One end of the coil is fixed to the housing of the device as a fix point and the other drives an indicating needle inside a circular indicator. A bimetallic strip is also used in a recording thermometer.
Nikola Tesla patented the Tesla coil circuit on April 25, 1891. [4] [5] and first publicly demonstrated it May 20, 1891 in his lecture "Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination" before the American Institute of Electrical Engineers at Columbia College, New York.
Mosquito coil Mosquito coil. A mosquito coil is a mosquito-repelling incense, usually made into a spiral, and typically made using dried paste of pyrethrum powder. The coil is usually held at the center of the spiral, suspending it in the air, or wedged by two pieces of fireproof netting to allow continuous smoldering.
An 1830 map showed the "Quoddy Hell-Gate" of "dangerous whirlpools" off the southern tip of Deer Island. The whirlpool is caused by local bathymetry and a 20-foot (6.1 m) tidal range [2] where waters exchange between Passamaquoddy Bay and the Bay of Fundy, combined with the topography of the location's sea floor at the confluence of the numerous local currents through channels and over small ...
The mountaineer's coil (also alpine coil, climber's coil, lap coil, or standing coil [2]) is a traditional method used by climbers to store and transport a climbing rope. [3] This older style coil is noted as being more prone to twists and tangles than the butterfly coil , and care must be taken upon uncoiling to avoid these problems.