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  2. Electromagnetically induced acoustic noise - Wikipedia

    en.wikipedia.org/wiki/Electromagnetically...

    The hissing of high voltage transmission lines is due to corona discharge, not magnetism. The phenomenon is also called audible magnetic noise, [1] electromagnetic acoustic noise, lamination vibration [2] or electromagnetically induced acoustic noise, [3] or more rarely, electrical noise, [4] or "coil noise

  3. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    An electric buzzer uses a similar mechanism to an interrupter bell, but without the resonant bell. They are quieter than bells, but adequate for a warning tone over a small distance, such as across a desktop. A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric.

  4. Buzzer - Wikipedia

    en.wikipedia.org/wiki/Buzzer

    A buzzer or beeper is an audio signaling device, [1] which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beepers include alarm devices , timers , train and confirmation of user input such as a mouse click or keystroke.

  5. Ringing (telephony) - Wikipedia

    en.wikipedia.org/wiki/Ringing_(telephony)

    Historically, this entailed sending a high-voltage alternating current over the telephone line to a customer station which contained an electromagnetic bell. It is therefore also commonly referred to as power ringing , to distinguish it from another signal, audible ringing, or ringing tone , which is sent to the originating caller to indicate ...

  6. Electric power transmission - Wikipedia

    en.wikipedia.org/wiki/Electric_power_transmission

    As of 2022, more than 10,000 power plant and energy storage projects were awaiting permission to connect to the US grid — 95% were zero-carbon resources. New power lines can take 10 years to plan, permit, and build. [33] Traditional power lines use a steel core surrounded by aluminum strands (Aluminium-conductor steel-reinforced cable).

  7. Mains hum - Wikipedia

    en.wikipedia.org/wiki/Mains_hum

    Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity. The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz , i.e., 100/120 Hz, depending on the local power-line frequency .

  8. Glossary of electrical and electronics engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_electrical_and...

    A DC to AC power converter. power-line communication The impression of carrier waves on a power line circuit for signalling purposes. power MOSFET A metal oxide semiconductor field effect transistor suitable for use in circuits handling more than a watt of power. power plant A facility that converts other energy forms into electric power. power ...

  9. Personal RF safety monitor - Wikipedia

    en.wikipedia.org/wiki/Personal_RF_safety_monitor

    Electromagnetic field monitors, as used in the cellular phone industry, are referred as "personal RF safety monitors", personal protection monitors (PPM) or RF exposimeters. [1] They form part of the personal protective equipment worn by a person working in areas exposed to radio spectrum radiation.

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