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.
Low blood pressure and rapid heart rate (tachycardia) are the key signs of shock. Symptoms of all types of shock include: Rapid, shallow breathing; Cold, clammy skin; Rapid, weak pulse; Dizziness or fainting; Weakness; Depending on the type of shock the following symptoms may also be observed: Eyes appear to stare; Anxiety or agitation; Seizures