It is my knowledge from internet that to electrolize one liter of water consumes 7.5 units of current. Then how a car owner can use hydrogen fuel ecomonically for his car or cooking purpose.

(may be broke/outdated!)
It is my knowledge from internet that to electrolize one liter of water consumes 7.5 units of current. Then how a car owner can use hydrogen fuel ecomonically for his car or cooking purpose.