i saw a show on Netflix (forces of nature- episode2 Elements)last night about how when salt water mixes with fresh water it makes energy. at the end they even do and experiment and shows how to light up a bulb.
I googled and found you can light up a bulb with just salt water.
so my questions are:
1) is anyone using salt water or a mix to make electric for off grid?
2)any ideas on how one could go about doing this?
Hmm. My bullshit detector went into the red on this one. Trivially simple to put a battery into the base of these bulbs and either a) wire in a small pressure switch that never gets shown to the camera, or b) edit the video right at the point of dropping the bulb into the "apparatus" when it lights up. Because what they're showing can't work.
These are bulbs designed to screw into a standard household socket and run off mains AC voltage, either 120 or 240 depending on what country you're in. To generate AC power, you either need a coil, a magnet, and movement at a steady frequency, or you need some electronic means of taking a DC power source and manufacturing an alternating current. The simple way to do this is with something that spins, and this is why nearly all power generation is done by turbines of some sort. I don't see anything moving in the plastic cup, nor do I see an inverter, so that means something is fishy.
The second thing I note is that the contacts on the bulb don't get connected to separate conductors...they both get immersed in the salt water. Salt water is a pretty good conductor, so this is about the same as running a single wire to both contacts, which means that there is no potential different between them, hence no circuit and no way for current to pass through the part of the bulb that does the business.
So, in a word: Nope. It's a hoax. They seem to have quite a supply of these videos, all variations on the theme.