Main Question or Discussion Point
if water is exposed to high voltage, it will ionize. What is the minimum voltage needed for that to happen? Thanks!
This will only give you an estimate of the ionization potential for H2O(gas). In the liquid state, the number is much lower, due to several effects that are not easy to calculate (you can think of these as described by a local dielectric constant). I believe the number for water is about 1 volt.What is the energy required to remove an electron from a hydrogen or oxygen molecule?
Multiply that by the number of coulombs of charge to get the energy. So the energy to remove an electon from a water molecule in the liquid state is .83eV or .83 x 1.6e-19 C = 1.3e-19 Joules.so, say a circuit is submerged in the water. The circuit requires only a 0.83V to ionize the surrounding waters?!? Wow! I though it would be much higher than that!
Heard of anyone that killed their cell phone by dropping it in water? Typical phone batteries run at somwhere between 3V and 4V - easily enough to ionize a path through water (if the phone case isn't watertight) and make a short.sunchips said:so, say a circuit is submerged in the water. The circuit requires only a 0.83V to ionize the surrounding waters?!? Wow! I though it wouold be much higher than that!
To the best of my knowledge, all immersion heaters have an electrically insulating (but thermally conductive) coating over the nichrome element. I'd expect the outer case to be grounded.I'm sorry..I think I didn't explain my situation well enough. I am asking, in terms of say....
suppose we have a heating element submerged in water. (e.g. a coffee maker, or amny other possible everyday things). When the current is passed through the nichrome heating element, will the current ionize the surrounding waters? is it powerful enough?