Even though biomechanical energy is technically more costly/impacting than most other forms of energy because our bodies are inefficiently creating it from food, which has related production and transportation costs and environmental consequences, I would turn towards it more for some trivial appliances around the house because, as a typical industrialized citizen, my nutritional intake provides a surplus of energy.
Similar to old clocks that use weights to maintain mechanical energy throughout the day, I would like a modified LED wall-mounted light that would be powered by a gradually falling weight. To turn the light on, I would raise the weight. My experience with hand-crank lights is that they need constant, minor activity on my part, which does not leave my hands free for holding a book and turning pages. I would much prefer to lift a 20kg weight and let its fall generate the energy for the light over a longer period of time, even if I have to lift the weight every few minutes.
Also, a stationary-bicycle-power option for television is a good idea for a lot of folks.
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