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  2. Qi (standard) - Wikipedia

    en.wikipedia.org/wiki/Qi_(standard)

    As an example from the 2017 version 1.2.2 of the Qi specification (referenced above), the A2 reference Qi low-power transmitter has a coil of 20 turns (in two layers) in a flat coil, wound on a form with a 19 mm inner diameter and a 40 mm outer diameter, with a below-coil shield of soft iron at least 4 mm larger in diameter which gives an ...

  3. Wireless Power Consortium - Wikipedia

    en.wikipedia.org/wiki/Wireless_Power_Consortium

    Qi's specifications were again updated in April, with the distance upped to 40mm. [36] In May 2014, the WPC announced that over 500 phones had Qi built-in. [37] As of October 2016, the WPC, along with the AirFuel Alliance, is compliant with the use of the LinkCharge CT standard in commercial enterprises and businesses to use as a charging ...

  4. Inductive charging - Wikipedia

    en.wikipedia.org/wiki/Inductive_charging

    The primary coil in the charger induces a current in the secondary coil in the device being charged. Inductive charging (also known as wireless charging or cordless charging) is a type of wireless power transfer. It uses electromagnetic induction to provide electricity to portable devices. Inductive charging is also used in vehicles, power ...

  5. Loading coil - Wikipedia

    en.wikipedia.org/wiki/Loading_coil

    A loading coil or load coil is an inductor that is inserted into an electronic circuit to increase its inductance. The term originated in the 19th century for inductors used to prevent signal distortion in long-distance telegraph transmission cables.

  6. Voice coil - Wikipedia

    en.wikipedia.org/wiki/Voice_coil

    A 7.5 cm diameter dual voice coil from a subwoofer driver. A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

  7. Rogowski coil - Wikipedia

    en.wikipedia.org/wiki/Rogowski_coil

    A Rogowski coil is a toroid of wire used to measure an alternating current I(t) through a cable encircled by the toroid. The picture shows a Rogowski coil encircling a current-carrying cable. The output of the coil, v(t), is connected to a lossy integrator circuit to obtain a voltage V out (t) that is proportional to I(t).

  8. Litz wire - Wikipedia

    en.wikipedia.org/wiki/Litz_wire

    The skin effect and proximity effect cause conductors to exhibit higher resistance to alternating current (AC) than to direct current (DC). Due to the dual inverse nature of the electromagnetic field, the skin effect dominates at frequencies less than about 2 MHz; at higher frequencies, the proximity effect becomes the dominant force, and Litz wire induces more DC losses than solid wire or ...

  9. Construction of electronic cigarettes - Wikipedia

    en.wikipedia.org/wiki/Construction_of_electronic...

    The electrical resistance of the coil, the voltage output of the device, the airflow of the atomizer and the efficiency of the wick all affect the vapor coming from the atomizer. [83] They also affect the vapor quantity or volume yielded. [83] Atomizer coils made of kanthal usually have resistances that vary from 0.4Ω to 2.8Ω. [83]