Yep! It is that easy! I had an older post where I made colloidal silver (took 2 days) from a mobile phone as power source. Off course I recommend a car battery, but it works if you are ever stuck in the bush Here is the link: https://steemit.com/prepper/@tzcap/what-do-a-smart-phone-rainwater-a-stick-a-wire-a-plastic-bottle-and-a-silver-coin-have-in-common