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2. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other. Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By ...

3. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   3 Australian light switches and a "neon" indicator—in a 4-gang wall-plate. The lower switch is in the "on" or "down" position. Two Australian rocker switches (disassembled), together with a cutaway view, and a view of the switch connections An Australian architrave-mounted 2-gang switch plate and switches.

4. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   Switches can be designed to respond to any type of mechanical stimulus: for example, vibration (the trembler switch), tilt, air pressure, fluid level (a float switch), the turning of a key , linear or rotary movement (a limit switch or microswitch), or presence of a magnetic field (the reed switch). Many switches are operated automatically by ...

5. Dimmer - Wikipedia

   en.wikipedia.org/wiki/Dimmer

   When the dimmer is at 50% power, the switches are switching their highest voltage (>325 V in Europe) and the sudden surge of power causes the coils on the inductor to move, creating a buzzing sound associated with some types of dimmer; this same effect can be heard in the filaments of the incandescent lamps as "singing". The suppression ...

6. Double switching - Wikipedia

   en.wikipedia.org/wiki/Double_switching

   Double switching is a crucial safety engineering practice in railway signalling, wherein it is used to ensure that a single false feed of current to a relay is unlikely to cause a wrong-side failure. It is an example of using redundancy to increase safety and reduce the likelihood of failure, analogous to double insulation. Double switching ...

7. Musk calls some MAGA supporters ‘contemptible fools’ as visa ...

   www.aol.com/news/musk-calls-maga-supporters...

   Tech billionaire Elon Musk labeled a section of President-elect Trump supporters as “contemptible fools” as the online debate around visas for highly skilled workers on the right intensifies.