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  2. Electrical outlet tester - Wikipedia

    en.wikipedia.org/wiki/Electrical_outlet_tester

    A receptacle tester being used to check for some types of improper wiring of an outlet. For this particular tester, proper wiring is indicated by the two yellow lights. The outlet tester checks that each contact in the outlet appears to be connected to the correct wire in the building's electrical wiring. It can identify several common wiring ...

  3. Portable appliance testing - Wikipedia

    en.wikipedia.org/wiki/Portable_appliance_testing

    In countries where the sockets are polarised, polarity testing is a simple test that can be carried out using a polarity tester to determine whether the line and neutral of the plug end are correctly connected to the corresponding terminals at the socket end. [11] [12]

  4. Polarity symbols - Wikipedia

    en.wikipedia.org/wiki/Polarity_symbols

    Diagram showing positive tip polarity on the left and negative tip polarity on the right. To read diagram: The center positive drawing on the left indicates that the center (also known as the tip) of the output plug is positive (+) and the barrel (ring) of the output plug is negative (−).

  5. Kill A Watt - Wikipedia

    en.wikipedia.org/wiki/Kill_A_Watt

    The Tweet-a-watt [13] is a hacked version of the standard Kill-A-Watt Plug in Power Meter. By piggybacking on the device's on-board LM2902N op-amp chip, the creator was able to get readings for voltage and current and transmit to a computer, which then sent this to Twitter via handle @tweetawatt. [ 14 ]

  6. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    Auto-polarity for direct-current readings, shows if the electric polarity of applied voltage is positive (agrees with meter lead labels) or negative (opposite polarity to meter leads). Sample and hold , which will latch the most recent reading for examination after the instrument is removed from the circuit under test.

  7. IEC 60320 - Wikipedia

    en.wikipedia.org/wiki/IEC_60320

    A variety of different kinds of IEC 60320 plugs and sockets. IEC 60320 Appliance couplers for household and similar general purposes [1] is a set of standards from the International Electrotechnical Commission (IEC) specifying non-locking connectors for connecting power supply cords to electrical appliances of voltage not exceeding 250 V (a.c.) and rated current not exceeding 16 A. [1 ...

  8. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    The flat parallel plug blades are polarized to prevent the hot and the neutral connections from being reversed. In addition, many versions have a molded obstruction bump on top of the adapter, to block the grounding prong and thus physically prevent forcible insertion of a 3-prong plug in the wrong orientation. [citation needed]

  9. AC adapter - Wikipedia

    en.wikipedia.org/wiki/AC_adapter

    "Power brick" in-line configuration, with detachable AC cord and NEMA 1-15 plug. An AC adapter or AC/DC adapter (also called a wall charger , power adapter , power brick , or wall wart ) [ 1 ] is a type of external power supply , often enclosed in a case similar to an AC plug . [ 2 ]

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