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Muscle-powered devices
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So why not? This type of energy is perhaps the most reliable and renewable. In the past, such devices were considered unnecessary due to their low efficiency. The topic of so-called "hand turbine power" is now of utmost relevance, as it can supply the smartphone battery with the necessary percentage to make a profitable phone call in every respect. It only takes a few minutes to turn the handle vigorously. We gain nothing by being able to charge manually - not even extra weight. Because a "dynamo" is often part of a power bank that practically every traveler brings with them. We talked about portable wind and water-powered turbines above, so you can untangle them with your hands.
