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  2. Fire alarm control panel - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_control_panel

    Trouble conditions are often activated by a contaminated smoke detector or an electrical problem within the system. Trouble conditions are also activated by a zone being disabled, a circuit or NAC being disabled, low power on the backup battery, disabling of a notification appliance, ground faults, or short or open circuits. Usually the alarm ...

  3. Simplex signaling - Wikipedia

    en.wikipedia.org/wiki/Simplex_signaling

    Simplex is also used to describe a powering method where one or more signal conductors carries direct current to power a remote device, which sends its output signal back on the same conductor. Phantom powering as used in audio is a form of simplex powering, as the return current flows through the ground or shield conductor.

  4. Simplex circuit - Wikipedia

    en.wikipedia.org/?title=Simplex_circuit&redirect=no

    This page was last edited on 28 November 2023, at 11:37 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  5. Failure of electronic components - Wikipedia

    en.wikipedia.org/wiki/Failure_of_electronic...

    A resistor removed from a high voltage tube circuit shows damage from voltaic arcing on the resistive metal oxide layer. Resistors can fail open or short, alongside their value changing under environmental conditions and outside performance limits. Examples of resistor failures include: Manufacturing defects causing intermittent problems.

  6. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...

  7. Fix problems signing in to AOL Mail

    help.aol.com/articles/fix-problems-signing-in-to...

    While most sign in problems can stem from password issues, you might also get blank or missing screens, or various errors when trying to sign in. No matter the problem you're experiencing, the following troubleshooting steps should help you get back in your AOL Mail quickly. Sign in again

  8. Open-circuit voltage - Wikipedia

    en.wikipedia.org/wiki/Open-circuit_voltage

    The voltage v oc between the terminals is the open-circuit voltage of the device. Black curve: The highest possible open-circuit voltage of a solar cell in the Shockley-Queisser model under unconcentrated sunlight, as a function of the semiconductor bandgap. The red dotted line shows that this voltage is always smaller than the bandgap voltage.

  9. Ford, GM donate $1 million and contribute vehicles to Trump's ...

    www.aol.com/news/ford-donates-1-million-fleet...

    DETROIT (Reuters) -U.S. automakers Ford Motor and General Motors will donate $1 million each, along with vehicles, to U.S. President-elect Donald Trump's January inauguration, company ...