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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. Wireless power transfer - Wikipedia

    en.wikipedia.org/wiki/Wireless_power_transfer

    A few systems, such as electric toothbrush charging stands, work at 50/60 Hz so AC mains current is applied directly to the transmitter coil, but in most systems an electronic oscillator generates a higher frequency AC current which drives the coil, because transmission efficiency improves with frequency.

  5. Spark-gap transmitter - Wikipedia

    en.wikipedia.org/wiki/Spark-gap_transmitter

    The charge on the capacitor discharges as a current through the coil and spark gap. Due to the inductance of the coil when the capacitor voltage reaches zero the current doesn't stop but keeps flowing, charging the capacitor plates with an opposite polarity, until the charge is stored in the capacitor again, on the opposite plates. Then the ...

  6. 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 ...

  7. Specific absorption rate - Wikipedia

    en.wikipedia.org/wiki/Specific_absorption_rate

    The FCC guide "Specific Absorption Rate (SAR) For Cell Phones: What It Means For You", after detailing the limitations of SAR values, offers the following "bottom line" editorial: ALL cell phones must meet the FCC’s RF exposure standard, which is set at a level well below that at which laboratory testing indicates, and medical and biological ...

  8. 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]

  9. Samsung Galaxy Note 9 - Wikipedia

    en.wikipedia.org/wiki/Samsung_Galaxy_Note_9

    The Note 9 has fast wireless charging capabilities via the Qi standard. Wired fast charging is supported at up to 15 Watts using Qualcomm Quick Charge 2.0. [ 13 ] [ 14 ] [ 15 ]