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  2. Automobile auxiliary power outlet - Wikipedia

    en.wikipedia.org/wiki/Automobile_auxiliary_power...

    Plus in newer cars, the power output from the lighter plug is so reliable that it can charge laptops, without any voltage problems. Standardized 12 volt DC automobile plugs are defined in the United States by UL Standard 2089 regarding vehicle battery adapters. This standard covers plugs and cord sets that insert into cigarette lighter receptacles.

  3. AC power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets

    The ground hole is officially D-shaped, although some round holes exist and many plugs have round ground pins. Both current-carrying blades on grounding plugs may be narrow, since the ground pin enforces polarity, but outlets have a wider opening for the neutral blade to prevent ungrounded polarized plugs from being put in backwards.

  4. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    The ground pin is round, like those on straight-blade NEMA grounding devices. Referring to the picture, the orientation is the same as the NEMA 5 plug and receptacle, with the neutral blade on the lower right. Adapters are available with the TT-30P plug on one side and a 5-15R or 5-20R receptacle on the other side.

  5. AC power plugs and sockets: British and related types

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets:...

    This was superseded in 1930 by BS 372 Side-Entry Wall Plugs and Sockets for Domestic Purposes Part II which states that there are only minor alterations from BS 317. In 1934, BS 372 Part II was in turn superseded by the first edition of BS 546 Two-Pole and Earthing-Pin Plugs and Socket Outlets. BS 546:1934 clause 2 specifies interchangeability ...

  6. Schuko - Wikipedia

    en.wikipedia.org/wiki/Schuko

    Double Schuko socket with one plug inserted. The dot in the middle of the socket is a screw head, not a third hole. Illustration of the originally two Schuko plug and socket designs from the patent specification of patent DE567906 granted on 22 December 1932. The right-hand column shows the design that prevailed and is in use today.

  7. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    Another style of mercury light switch uses a metal wheel with an insulator separating the two halves that has a hole which allows the mercury to connect either side of the wheel in only one position. [12] Some of these switches were also equipped with a neon lamp connected across the contacts, and thus in series with the electrical load. This ...

  8. DC connector - Wikipedia

    en.wikipedia.org/wiki/DC_connector

    Some common DC power connectors. A DC connector (or DC plug, for one common type) is an electrical connector that supplies direct current (DC) power.. Compared to domestic AC power plugs and sockets, DC connectors have many more standard types that are not interchangeable.

  9. Tube socket - Wikipedia

    en.wikipedia.org/wiki/Tube_socket

    The Rimlock (B8A) base is an eight-pin design with a pin circle diameter close to Noval, and uses a nub on the side of the envelope to engage with a guide and retaining spring in the socket wall. This provides pin registration (since the pins are equi-spaced) and also a fair degree of retention.

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