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  2. Doorbell - Wikipedia

    en.wikipedia.org/wiki/Doorbell

    Pressing the doorbell button, a single-pole, single-throw (SPST) pushbutton switch momentarily closes the doorbell circuit. One terminal of this button is wired to a terminal on a transformer. A doorbell transformer steps down the 120 or 240-volt AC electrical power to a lower voltage, typically 6 to 24 volts. The transformer's other terminal ...

  3. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    In residential applications, a small bell-ringing transformer is usually used to power the doorbell circuit. So that bell circuits can be made with low-cost wiring methods, bell signal circuits are limited in voltage and power rating. [3]

  4. Electrical wiring - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring

    US single-phase residential power distribution transformer, ... late 1960s to mid-1970s due to the rising cost of ... and control applications such as doorbell ...

  5. 12 Household Items You Should Be Replacing Regularly — and ...

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  6. Transformer types - Wikipedia

    en.wikipedia.org/wiki/Transformer_types

    A planar transformer Exploded view: the spiral primary "winding" on one side of the PCB (the spiral secondary "winding" is on the other side of the PCB) Manufacturers either use flat copper sheets or etch spiral patterns on a printed circuit board to form the "windings" of a planar transformer, replacing the turns of wire used to make other ...

  7. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    From around 1905 to 1910 various mercury switches were invented, but the "mercury in glass envelope" switch got its start with patent 1598874 (filed on January 19, 1922 by Louis Phelan), [1] which evolved into a more modern mercury switch with a straight tubular glass envelope via patent 2232626 (filed on October 7, 1937 by Harold Olson of Honeywell).

  8. Musk has until Monday to respond to SEC Twitter settlement ...

    www.aol.com/news/us-sec-extended-timeline-musk...

    The U.S. Securities and Exchange Commission has given Elon Musk until Monday to respond to an offer to resolve a probe into the billionaire's $44-billion takeover of Twitter in 2022, a source ...

  9. Phase converter - Wikipedia

    en.wikipedia.org/wiki/Phase_converter

    An American Rotary Phase Converter with a Transformer. A phase converter is a device that converts electric power provided as single phase to multiple phase or vice versa. The majority of phase converters are used to produce three-phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.

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