![Siemens alternate current dynamo. A ship's generator from 1892; you would find this in the ship's engine room. | CanStock Siemens alternate current dynamo. A ship's generator from 1892; you would find this in the ship's engine room. | CanStock](https://cdn.w600.comps.canstockphoto.com/siemens-alternate-current-dynamo-stock-illustrations_csp5625497.jpg)
Siemens alternate current dynamo. A ship's generator from 1892; you would find this in the ship's engine room. | CanStock
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![Direct-current generators based on conductive polymers for self-powered flexible devices | Scientific Reports Direct-current generators based on conductive polymers for self-powered flexible devices | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-021-99447-x/MediaObjects/41598_2021_99447_Fig1_HTML.png)