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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. Electromagnetic induction - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_induction

    When the electric current in a loop of wire changes, the changing current creates a changing magnetic field. A second wire in reach of this magnetic field will experience this change in magnetic field as a change in its coupled magnetic flux, . Therefore, an electromotive force is set up in the second loop called the induced emf or transformer emf.

  4. Electric bell - Wikipedia

    en.wikipedia.org/wiki/Electric_bell

    Older electric doorbell. An electric bell is a mechanical or electronic bell that functions by means of an electromagnet.When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.

  5. Induction coil - Wikipedia

    en.wikipedia.org/wiki/Induction_coil

    Invented in 1836 by the Irish-Catholic priest Nicholas Callan, also independently by American inventor Charles Grafton Page, [1] the induction coil was the first type of transformer. It was widely used in x-ray machines , [ 1 ] [ 6 ] spark-gap radio transmitters , [ 1 ] [ 6 ] arc lighting and quack medical electrotherapy devices from the 1880s ...

  6. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.

  7. Electromagnet - Wikipedia

    en.wikipedia.org/wiki/Electromagnet

    The hollow copper tube acts like a single-turn secondary winding of a transformer; when the pulse of current from the capacitor in the windings creates a pulse of magnetic field, this creates a strong circumferential current in the tube, trapping the magnetic field lines within. The explosives then collapse the tube, reducing its diameter, and ...

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