Why does a household switch has two segments (in my knowledge they are for both live and neutral)? According to my physics book, the switch is always connected to a live wire. -
![Neutral Connection in the Back of a 2 Way Switch - 2 Plate Method - Taking the Feed to the Switch - YouTube Neutral Connection in the Back of a 2 Way Switch - 2 Plate Method - Taking the Feed to the Switch - YouTube](https://i.ytimg.com/vi/LtxBG6Uwg6Y/maxresdefault.jpg)
Neutral Connection in the Back of a 2 Way Switch - 2 Plate Method - Taking the Feed to the Switch - YouTube
![Yagusmart WiFi Smart Wall Light Switch, No Neutral Wire Required, No Hub Required, Compatible with Alexa and Google Home, APP Remote Control, Timing Function, Voice Control(1 Gang-Black) : Amazon.co.uk: DIY & Tools Yagusmart WiFi Smart Wall Light Switch, No Neutral Wire Required, No Hub Required, Compatible with Alexa and Google Home, APP Remote Control, Timing Function, Voice Control(1 Gang-Black) : Amazon.co.uk: DIY & Tools](https://m.media-amazon.com/images/S/aplus-media/sc/2d86dd2a-d47c-4f32-abb2-37d4108d0b3f.__CR0,0,970,600_PT0_SX970_V1___.jpg)
Yagusmart WiFi Smart Wall Light Switch, No Neutral Wire Required, No Hub Required, Compatible with Alexa and Google Home, APP Remote Control, Timing Function, Voice Control(1 Gang-Black) : Amazon.co.uk: DIY & Tools
![wiring - Converting a 3 way switch without neutral to a smart switch that needs one - Home Improvement Stack Exchange wiring - Converting a 3 way switch without neutral to a smart switch that needs one - Home Improvement Stack Exchange](https://i.stack.imgur.com/2anyu.png)