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Clash Royale CLAN TAG #URR8PPP up vote 2 down vote favorite I have an iPhone, and sometimes recharging it from a wall is inconvenient. Maybe I am on a long bus ride. If I am willing to do physical activity/exercise to produce power, how much effort would I need to exert to act as a phone charger, supplying a steady 1–2 amps at 5 V? This hypothetical device would need to be small and light enough that I could carry it... no point in it if I have to be at home to use it. For example, there’s a simple hand exercise device that you squeeze over and over to build hand muscle. How much power could that generate? power-supply share | improve this question asked 3 hours ago Philip 111 2 New contributor Philip is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. I won't say too much, but I will point to this link: newatlas.com/…. It is a st