Understanding the power to my door bell
I would like to understand how my outside door bell light works.
Based on what I understand (the outside wire) it's one wire getting interrupted & when pressing the door bell it creates contact resulting in the inside door chime to move and make ding dung sound.
But how does the actual light outside on the bell light up since it's one wire (I.e. Positive wire)? As well as when I measure the voltage on the wire itself I'm getting 24V.
How is that possible I would like to understand that.
Same thing with my thermostat wire, when I measure the voltage I'm getting 24 volts but based on my understanding it's one wire making contact when requesting for heat. (It's heat only zone) so how come I'm getting 24 volts
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