In fact, the electric conductivity is a function of the structure of the material and often changes by heating (cooking); however in some foods, the overall heating effect might be too little to alter the pattern of electrical conductivity. There are also critical s values below 0.01 S/m and above 10 S/m where OH is not applicable. This is because very large voltages or very large amperage values would be needed to generate the amount of heat required raising temperature substantially by the Joule effect, in case of very low or very large s values, respectively