The minimum voltage necessary to generate hydrogen and oxygen from water by electrolysis is 1.23 V. It depends on how you do it if it will take that much or more (if you don't use the correct...
On the average, over the temperature range from zero to 100 Celsius,it takes 1 calorie of energy to heat each milliliter of water you haveby 1 degree Celsius.
The amount of energy to boil water depends on two things: the amount of water and the temperature of the water when you start. The more water water, the more energy it takes. The colder the water,...