1. How much electrictiy would be needed to electrolyse 1 unit of water (say, 1 litre)?

And also, how much electricity does the average geothermal power plant produce in a year?

(I think you can guess where this is going...)  2.

3. you mean homework? Busted!  4. What do you mean by "how much electricity"? Are you asking about the voltage, energy, current*time, or what?  5. current*time would be nice.  6. Assume efficiency of 70% in converting the electrical energy to hydrogen.
http://en.wikipedia.org/wiki/Electrolysis
The enthalpy change is 285.83 kJ per mole of water (18 grams of water) which works out to 15,879,444 joules per kilogram.
http://hyperphysics.phy-astr.gsu.edu.../electrol.html
The largest dry steam field in the world is The Geysers, 72 miles (116 km) north of San Francisco. The Geysers produces over 750 MW net.
http://en.wikipedia.org/wiki/Geothermal_power
This is about the size of an average to smallish nuclear or coal fired plant.
One megawatt-hour is equal to 3.6*10^9 joules.
Therefore in one hour of operation, The Geysers could hydrolyze around 0.7*750*3.6*10^9/15,879,444 = 119000 liters of water in one hour.  Posting Permissions
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