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  2. Fail-safe - Wikipedia

    en.wikipedia.org/wiki/Fail-safe

    For example, a potentiometer indicating pedal position might only travel from 20% to 80% of its full range, such that a cable break or short results in a 0% or 100% reading. In control systems, critically important signals can be carried by a complementary pair of wires (<signal> and <not_signal>).

  3. Power supply unit (computer) - Wikipedia

    en.wikipedia.org/wiki/Power_supply_unit_(computer)

    For example, a 900-watt power supply with the 80 Plus Silver efficiency rating (which means that such a power supply is designed to be at least 85% efficient for loads above 180 W) may only be 73% efficient when the load is lower than 100 W, which is a typical idle power for a desktop computer. Thus, for a 100 W load, losses for this supply ...

  4. Supercapacitor - Wikipedia

    en.wikipedia.org/wiki/Supercapacitor

    This time constant determines the charge/discharge time. A 100 F capacitor with an internal resistance of 30 mΩ for example, has a time constant of 0.03 • 100 = 3 s. After 3 seconds charging with a current limited only by internal resistance, the capacitor has 63.2% of full charge (or is discharged to 36.8% of full charge).

  5. Battery charger - Wikipedia

    en.wikipedia.org/wiki/Battery_charger

    The C-rate is defined as the charge or discharge current divided by the battery's capacity to store an electrical charge. While rarely stated explicitly, the unit of the C-rate is h −1, equivalent to stating the battery's capacity to store an electrical charge in unit hour times current in the same unit as the charge or discharge current. The ...

  6. List of laptop brands and manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_laptop_brands_and...

    Texas Instruments sold its laptop business to Acer in 1997. Toshiba: Japan Dynabook, Libretto, Portégé, Satellite, Satellite Pro, Qosmio, T series, Tecra: Toshiba fully exited the personal computer and laptop business in June 2020, transferring the remaining 19.9 percent shares to Sharp Corporation, which now runs the business as Dynabook Inc ...

  7. Charging station - Wikipedia

    en.wikipedia.org/wiki/Charging_station

    Both the North America and the EU port take 480 V DC fast charging through Tesla's network of Superchargers, which variously use NACS and CCS charging connectors. Depending on the Supercharger version, power is supplied at 72, 150, or 250 kW, the first corresponding to DC Level 1 and the second and third corresponding to DC Level 2 of SAE J1772.

  8. Usage share of operating systems - Wikipedia

    en.wikipedia.org/wiki/Usage_share_of_operating...

    StatCounter web usage data of desktop or laptop operating systems varies significantly by country. For example, in 2017, macOS usage in North America was at 16.82% [99] (17.52% in the US [100]) whereas in Asia it was only 4.4%. [101] As of July 2023, macOS usage has increased to 30.81% in North America [102] (31.77% in the US) [103] and to 9.64 ...

  9. Lucent Technologies - Wikipedia

    en.wikipedia.org/wiki/Lucent_Technologies

    Lucent Technologies, Inc. was an American multinational telecommunications equipment company headquartered in Murray Hill, New Jersey.It was established on September 30, 1996, through the divestiture of the former AT&T Technologies business unit of AT&T Corporation, which included Western Electric and Bell Labs.