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  2. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    4.11 35 volt series heater tubes. 4.12 50 volt series heater tubes. ... PM254 = P425 – "Super Power" triode with a 4 V/200 mA battery heater and a British 4-pin base;

  3. Industrial and multiphase power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/Industrial_and_multiphase...

    The type 15 plug and socket has 3 round pins of 4 mm diameter, plus 2 flat pins (for L2 and L3). It is designed for three phase applications and is rated at 10 A, 250 V/440 V. The socket will also accept types 11 and 12 plugs, and the Europlug. The type 25 plug and socket has 3 rectangular pins, 4 mm x 5 mm, plus 2 flat pins (for L2 and L3).

  4. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    This battery had two-pin connectors. They were a single ⌀3.2 mm negative pin and a single ⌀4.0 mm positive pin spaced 13.0 mm apart. PP11: 4.5 + 4.5: H: 91.3 L: 65.1 W: 52.4 This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series.

  5. Battery terminal - Wikipedia

    en.wikipedia.org/wiki/Battery_terminal

    Six-volt lantern batteries typically feature two coiled, cone-shaped spring terminals, designed to mate with flat contact plates on the inside of the battery compartment. Some lantern batteries instead feature screw terminals, while still others instead feature pin holes. [1] Nine-volt batteries have snap-on connectors.

  6. Coaxial power connector - Wikipedia

    en.wikipedia.org/wiki/Coaxial_power_connector

    Used in very rare Nokia phones (ACH-4) 3.80 1.30 Egston 217 3.80 1.35 CUI Inc. P8 3.80 1.40 9.0 12VDC @ 0.5A Marushin Electric MP-138NK Used in TP-Link Gigabit switch model TL-SG105(UN) Ver:6.0 4.00 1.70 9.5 B EIAJ-02 3.15–6.3 V Kobiconn 3219-EX Lumberg 1636 02 Kobiconn 0311-EX (inline) Used in Lenovo Flex 4 adapter

  7. Battery charger - Wikipedia

    en.wikipedia.org/wiki/Battery_charger

    Charging a 12 V lead–acid car battery A mobile phone plugged in to an AC adapter for charging. A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it.

  8. Polarity symbols - Wikipedia

    en.wikipedia.org/wiki/Polarity_symbols

    The adapter typically supplies power to the device through a thin electrical cord which terminates in a coaxial power connector often referred to as a "barrel plug" (so-named because of its cylindrical shape). The polarity of the adapter cord and plug must match the polarity of the device, meaning that the positive contact of the plug must mate ...

  9. List of battery types - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_types

    This list is a summary of notable electric battery types composed of one or more electrochemical cells. Three lists are provided in the table. Three lists are provided in the table. The primary (non-rechargeable) and secondary (rechargeable) cell lists are lists of battery chemistry.

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