Hello, not quite sure thats the right category to write in, but I reently got confused with the electricity.In my home, the contacts provide 220V 3-5A, and have 2 holes and one small plate. The holes are for plus and minus voltage and the plate is for ground.Now the questions:1. Why are there +, - and GND;2. What is the difference between ground and minus;3. And why the arduino has only GND and +?
that connects to the 'salty/conductive' earth in the soil
I knew the sea was salty but I didn't know the soil was.
In your house the neutral should be connected to earth ground at the breaker box.
Weren't there attempts at something like this for trench comms in WWI ?