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2. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   Three-prong plugs do not fit into the older, two-prong receptacles. [7] When used as intended, the ground pin of the 3-wire receptacle is to be connected to a grounded cover screw, or to an external ground. In 1969, Underwriters Laboratories mandated three-prong plugs on major appliances for safety. [7]

3. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   Ratings of NEMA 5-15 (type B) plug marked on the label (left: 7 A 125 V), engagement face, and IEC 60320 C13 connector at the appliance end of the cord (centre, right: both 10 A 125 V) Plugs and power cords have a rated voltage and current assigned to them by the manufacturer. Using a plug or power cord that is inappropriate for the load may be ...

4. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   The addition is a 3 ⁄ 16-inch (4.8 mm) diameter round or U-shaped ground pin, 1 ⁄ 8 in (3.2 mm) longer than the power blades (so the device is grounded before the power is connected) and located from them by 1 ⁄ 4 in (6.4 mm) edge-to-edge or 15 ⁄ 32 in (11.9 mm) center-to-center.

5. 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 ...

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

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

   In 1934 the dual plug system was introduced with the socket rated at 15 A and three sizes of plug, fused 2 A and 5 A plugs and a 15 A plug. The 15 A "dual plug" incorporated a socket with narrower apertures than a standard Wylex 15 A socket, that accepted only the narrow rectangular pins of the lower-rated plugs. [ 27 ]

7. ThinkPad T series - Wikipedia

   en.wikipedia.org/wiki/ThinkPad_T_Series

   The ThinkPad T series is a line of notebook computers manufactured by Lenovo as part of the ThinkPad family. The T series is officially the flagship ThinkPad product, offering high-performance computers aimed at businesses and professionals. [1] The ThinkPad T series was originally introduced in 2000 and was produced by IBM until 2005.