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2. Skin effect - Wikipedia

   en.wikipedia.org/wiki/Skin_effect

   The AC frequencies used in induction cookers are much higher than standard mains frequency ‒ typically around 25–50 kHz. In electromagnetism , skin effect is the tendency of an alternating electric current (AC) to become distributed within a conductor such that the current density is largest near the surface of the conductor and decreases ...

3. Shading coil - Wikipedia

   en.wikipedia.org/wiki/Shading_coil

   AC relay with shading coil (red arrow near top) for operating with AC. A shading coil or shading ring (Also called Frager spire or Frager coil) is one or more turns of electrical conductor (usually copper or aluminum) located in the face of the magnet assembly or armature of an alternating current solenoid. The alternating current in the ...

4. The 6 best (and best-looking) window AC covers to keep the ...

   www.aol.com/best-window-ac-covers-to-keep-the...

   Just cover it with one of these insulated window AC covers to keep the draft out. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...

5. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   During winter months, for example, an air conditioning register can be closed to prevent cold air from being pulled from the room. This allows the hot air to mix more completely with the cold air in the room, improving the efficiency of the HVAC system. [7] (The return should be efficient enough to draw off the cooler air.) [10] [11]

6. Proximity effect (electromagnetism) - Wikipedia

   en.wikipedia.org/wiki/Proximity_effect...

   In electromagnetics, proximity effect is a redistribution of electric current occurring in nearby parallel electrical conductors carrying alternating current (AC), caused by magnetic effects. In adjacent conductors carrying AC current in the same direction, it causes the current in the conductor to concentrate on the side away from the nearby ...

7. Contactor - Wikipedia

   en.wikipedia.org/wiki/Contactor

   AC arcs have periods of low current, during which the arc can be extinguished with relative ease, but DC arcs have continuous high current, so blowing them out requires the arc to be stretched further than an AC arc of the same current. The magnetic blowouts in the pictured Albright contactor (which is designed for DC currents) more than double ...