Uhh... what if you use a battery for the current?  You'd have to charge the battery every night, and the battery would have to be effectively large enough to be able to propel the car... sounds like a *really* inefficient EV. That's correct. In a perfect machine, splitting water into H & O takes exactly the same amount of energy as you generate from combining H & O. You have no energy left over. To make such a vehicle, you need a small external energy source to make up for energy losses (heat, primarily), plus a 350 Chevy burning fossil fuels to make the vehicle go from one place to another. The vehicle will, of course, go a lot better if you leave the machine that generates and combines H & O behind in the garage. regards m

1954:  Man invented carburetor that converted water to Hydrogen (by zapping it with electricity) before injecting it in to the engine...  You could safely run a car on water.  Oil companies bought the patents, and shelved it. Under US law, these patents would have expired twenty years ago. The oil companies also assassinated the patent officer and burned down the patent office. But I'll sell you the plans for $100 (cash). m

1954:  Man invented carburetor that converted water to Hydrogen (by zapping it with electricity) before injecting it in to the engine...  You could safely run a car on water.  Oil companies bought the patents, and shelved it. Under US law, these patents would have expired twenty years ago. The oil companies also assassinated the patent officer and burned down the patent office. But I'll sell you the plans for $100 (cash). m Great. Now we're both dead.

<snip Ummm.... actually the energy you yield is more than you put in. It takes very little DC current to split the H2 and the O.  When the H2 and O are ignited in their gaseous form, they provide a very nice explosion... That explosion will be powerful enough to run your engine. Use one of the belts on your car, such as the alternator belt, and attach it to your generator that is breaking down the H20 bonds and you've got your vehicle. For those of you arguing about chemical equations...  I agree that you can't get something for nothing, and that each side must be equal.  The thing is, you are arguing that the hydrogen and oxygen being turned in to water are on one side of the equation and that the water being split in to the two separate gasses is on the other...  Thats not entirely correct. I am not an engineering degree holder (but am studying to become one), so don't flame me if I don't explain this perfectly... 1.  Hydrogen is not combustible when chemically bonded to oxygen...  You would use X amount of electricity to separate the two gas molecules. 2.  Hydrogen is extremely flammable by itself, and is highly explosive when combined with oxygen gas (WAAAAYYYYYY more than gasoline).  The explosion that comes from the hydrogen and oxygen mix is much more powerful than the energy required to electrically break the bond up. It is possible.  It was possible in 1954, do some digging and come back with what you find...  You may find yourself arguing on my side. Sol