One of my family members recently sent me a link to this Better Earthing website about the alternative therapy of "earthing".
The site includes which includes a video that claims to show "excess AC voltage" and how to reduce it with their product. (The video on YouTube if you don't want to visit the site itself: https://www.youtube.com/watch?v=pJJNQWKXUpE)
I'm curious about what physical or electrical effect is actually being demonstrated in the video.
The description on the video says:
Peter demonstrates how to use an autorange multimeter to measure the conductivity of [the earthing] products. You'll see a 100 times reduction in excess AC voltage in Peter's body when he starts Earthing.
The setup in the video shows:
- a multimeter connected to ground (via the ground pin of a power outlet, no connections to the live wires)
- the multimeter set to read "AC voltage"
- a person touching the test lead to the multimeter
- there is no current source in the circuit - i.e. no connection to AC power source at the wall socket
They then taking readings from the multimeter in a couple of sitations:
- A. just holding the test lead
- B. holding the test lead whilst holding a hand over a light switch
- C. holding the test lead whilst sitting or lying on an earthing mat, which is also connected to ground
I've transcribed what he says at the different points of the video:
- A. 1:17 "I've got 3.1 volts of AC voltage in my body"
- B. 1:20 "If I put my hand [on] this light switch I'm ... up over 10 volts, I'm up to 11. So I've now got 11 volts of voltage in my body that I'm picking up from live wires."
- C. 2:08 "I'm sitting directly on [the earthing bed sheet] and I've just gone down 2.1 [volts], to one third of a volt from about 3 volts. So that's about a 25-, almost 30-fold, decrease"
- the measurement seems to go down to a reading of 0.13V
I only have a very basic understanding of electronics/electricity, but it doesn't make sense to me what the multimeter could be measuring without a flow of electrons to measure as current.
So my question is pretty much: what is actually going on in this video?
- In situation A (just holding the lead of the multimeter) what is the multimeter measuring?
- is it any sort of meaningful measurement if there is no electricity source?
- is it even considered a circuit if a person is just connected to ground?
- if there is no source or load in the circuit then what flow of current is the multimeter reading as the AC voltage?
- In situation B, how might holding the hand over a light switch cause the reading to increase?
- In situation C, what is happening to cause the voltage reading to decrease?
- the circuit ground-to-ground connection with a person and multimeter in between - how is that different to the "circuit" in situation A?
This question seems to be asking a similar question. However, there isn't a clear answer that I could understand and the experience of the question-asker seemed to be the opposite of what was being shown in this video (unless I'm mistaken?).
Previous discussin of earthing in the Skeptics community:
Not sure if it helps, but the multimeter being used is the Digitech QM1529.