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What is the most efficient way to get electricity from shaking? I am thinking about something like shown in the picture below (the magnet is going inside the coil), but maybe there is a better design for it. Efficient I mean by power, like what percentage of vibration energy is converted to electricity. If it is a coil, what would be the best coil design (how many turns of wire and wire diameter I need, etc.)? Maybe there are some articles about it and how to fully calculate it as well.

enter image description here

There is this flashlight design on the internet, but is it the most efficient?

enter image description here

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  • $\begingroup$ It exists. I have a rechargeable torch that does exactly that except there is a spring at either end of the tube. $\endgroup$
    – Solar Mike
    Jul 7 at 11:26
  • $\begingroup$ @SolarMike Yes, I saw it on the internet. The question is it the most efficient way or there are other ways to do it? $\endgroup$
    – Zlelik
    Jul 7 at 11:29
  • $\begingroup$ Yes, it is efficient / battery never goes glat and you can always recharge it. $\endgroup$
    – Solar Mike
    Jul 7 at 11:44
  • $\begingroup$ worry a bit more about your diodes. Shaking at some inconsistent frequency needs to get controlled lest you undo the work on the return stroke. $\endgroup$
    – Abel
    Jul 7 at 13:05

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