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  2. Power symbol - Wikipedia

    en.wikipedia.org/wiki/Power_symbol

    IEC 60417-5007, [6] the power-on symbol (line), appearing on a button or one end of a toggle switch indicates that the control places the equipment into a fully powered state. (1 or | means on.) IEC 60417-5008, [7] the power-off symbol (circle) on a button or toggle, indicates that using the control will disconnect power to the device. (0 or ...

  3. Electronic symbol - Wikipedia

    en.wikipedia.org/wiki/Electronic_symbol

    Wire crossover symbols for circuit diagrams. The CAD symbol for insulated crossing wires is the same as the older, non-CAD symbol for non-insulated crossing wires. To avoid confusion, the wire "jump" (semi-circle) symbol for insulated wires in non-CAD schematics is recommended (as opposed to using the CAD-style symbol for no connection), so as to avoid confusion with the original, older style ...

  4. Electric battery - Wikipedia

    en.wikipedia.org/wiki/Electric_battery

    An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections [1] for powering electrical devices. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode. [2] The terminal marked negative is the source of electrons.

  5. History of the battery - Wikipedia

    en.wikipedia.org/wiki/History_of_the_battery

    The dry cell form was used to power early telephones—usually from an adjacent wooden box affixed to fit batteries before telephones could draw power from the telephone line itself. The Leclanché cell can not provide a sustained current for very long. In lengthy conversations, the battery would run down, rendering the conversation inaudible. [12]

  6. 'Extremely disturbing': High levels of heavy metals at ... - AOL

    www.aol.com/news/extremely-disturbing-high...

    The Elkhorn Slough Reserve was closed to the public from Jan. 17 to Jan. 21 while it and residential areas near the power plant were under evacuation orders due to the fire. It is now open to ...

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