Question

How can muscular energy be convert into electrical energy?

Answer 1

Anything that converts another form of energy to electricity is a generator. If you're referring to myoelectric signals, as are used in controlling prosthetic devices, that isn't conversion. It's merely detection of what is already electricity.

Answer 2

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Muscle stretching results in the back and forth stretching of the substrate and the nanowire. The piezoelectric potential created inside the wire leads to the flow of electrons in the external circuit. The output voltage has been increased by integrating multiple SWGs.