A low DC voltage is produced by the thermocouple when the two junctions are at different temperatures. This voltage is referred to as the thermoelectric voltage. This thermoelectric voltage is produced by the temperature gradient along the thermocouple wires.
Re: What's causes the electric shock type pain in a tooth Hi DM69. I'm not a dentist but I'm pretty sure its the erosion of your tooth exposing the pulp, I had the exact same feeling in my tooth before I had it extracted a month ago, so I feel your pain.
I get these all the time, and I don't have an ICD. I get sharp stabbing shocks in hip bones, in skull bones, and in breast cartillege. I haven't got any answers as to what is causing these, nor the constant electric current sensation I feel, which seems to originate in my ears, then, spreads throughout my brain.