Do like this:
Put a source of DC or AC current with an electronical millisecond switch and a capacitor of the same power like the source with another switch and finally the load.
When the first switch is on, the other must be off and viceversa, all the time.
If you will make this circuit to run by keeping only one thing in your mind, that is of NEVER PUT THE SOURCE IN DIRECT CONTACT WITH THE LOAD, probably you shall have some FREE ENERGY.
I mean the time till your source will be off its power will be much more greater with this circuit attached than puting in direct contact the source with the load.
It's better to see the whole document here:
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First, I urge you to try it and write your comments after, please.