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.
Trigeminal neuralgia is a condition manifesting with extreme facial pain that can feel like burning or an electric shock. The pain is severe enough that daily activities, such as chewing, eating, or teeth brushing, can be agonizing. Other neurologic causes of facial pain include Bellâs palsy and Parkinsonâs disease.