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This is a new idea in a field where there hasn't been a lot of new ideas that try to address this issue, said Bill Unruh, a physics and astronomy professor who supervised Wang's work.
Human power is work or energy that is produced from the human body. It can also refer to the power (rate of work per time) of a human. Power comes primarily from muscles, but body heat is also used to do work like warming shelters, food, or other humans.
Human-powered transport includes bicycles, rowing, skiing and many other forms of mobility.
Human-powered equipment is occasionally used to generate, and sometimes to store, electrical energy for use where no other source of power is available. These include the Gibson girl survival radio, wind-up or (clockwork) radio and pedal radio.
During a bicycle race, an elite cyclist can produce close to 400 watts of mechanical power over an hour and in short bursts over double that — 1000 to 1100 watts; modern racing bicycles have greater than 95% mechanical efficiency. An adult of good fitness is more likely to average between 50 and 150 watts for an hour of vigorous exercise. Over an 8-hour work shift, an average, healthy, well-fed and motivated manual laborer may sustain an output of around 75 watts of power. However, the potential yield of human electric power is decreased by the inefficiency of any generator device, since all real generators incur considerable losses during the energy conversion process.
Several forms of transport utilize human power. They include the bicycle, wheelchair, walking, skateboard, wheelbarrow, rowing, skis, and rickshaw. Some forms may utilize more than one person. The historical galley was propelled by freemen or citizens in ancient times, and by slaves captured by pirates in more recent times. The MacCready Gossamer Condor was the first human-powered aircraft capable of controlled and sustained flight, making its first flight in 1977. In 2007, Jason Lewis of Expedition 360 became the first person to circumnavigate the globe at non-polar latitudes using only human power — walking, biking, and rollerblading across the landmasses; and swimming, kayaking, rowing, and using a 26-foot-long pedal-powered boat to cross the oceans.
Some equipment uses human power. It may directly use mechanical power from muscles, or a generator may convert energy generated by the body into electrical power.