Sorry for the title, I meant VOLTMETER, NOT MULTIMETER.
This might sound so stupid, but I was thinking... A voltmeter works by reading the potential difference between 2 points, so you want to connect it parallel to the device you want to measure.
My question is, if air is at 0V, why a voltmeter doesn't read the voltage if you put one probe in the 120V live wire and the other flying in the air?
Why are you required to put it into the ground wire hole to read those 120V?
This looks so stupid but I'm having my mind blown. Take me out of this stupidity!
This might sound so stupid, but I was thinking... A voltmeter works by reading the potential difference between 2 points, so you want to connect it parallel to the device you want to measure.
My question is, if air is at 0V, why a voltmeter doesn't read the voltage if you put one probe in the 120V live wire and the other flying in the air?
Why are you required to put it into the ground wire hole to read those 120V?
This looks so stupid but I'm having my mind blown. Take me out of this stupidity!