So I put my meters current probe on these new cells. It showed 2 - 5 micro amps. Then I put it on ones I made over a year ago which had a lot more of the carbon material and they measured between 100 - 200 micro amps. Calculator does not drain them. Ran for 25 minutes, no discernible change in voltage during the run. A few tests here. What’s the lowest power rated dc motor? Like to see if I can run these flat using inductive load. https://youtu.be/FZoGDT6GIts
Hi JimBoot, On your question at video time around 11:24, my answer is that the DMM ampermeter does shorts out the calculator, so there is no any cell voltage (the 1.495 - 1.5V) left to run the calculator. IF you have a 2nd DMM, switch it into the some kOhm resistance range and then you can check with it the internal resistance of your 1st DMM set to the same microamper measuring range: that resistance value you will see is what 'shorted out' your calculator and took away the current from it. Re your question on lowest power rated motor: if you mean off the shelf types, there is little or no choice because the current loadable from the cell is in the some hundred uA range. The smallest current draw motor I found on ebay is this https://www.ebay.com/itm/262550362464 and it needs 10 mA run from 1.5V when the shaft is unloaded. Lasersaber showed the EZ-Spin motor with coils in series connection, having at least 15 kOhm DC resistance or higher and it has current consumption in the some 10 to some hundred uA range. One of his latests with crystal cell feeding is here: https://www.youtube.com/watch?v=2nCuGtEDI5g His so far ultimate motor is here: https://www.youtube.com/watch?v=wNcgnooayDc Gyula
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