The resistance of an exercise bike is often provided by a generator; that is, th

Question

The resistance of an exercise bike is often provided by a generator; that is, the energy that you expend is used to generate electric energy, which is then dissipated. Rather than dissipate the energy, it could be used for practical purposes A.) A typical person can maintain a steady energy expenditure of 400 { m W} on a bicycle. Assuming a typical efficiency for the body and a generator that is 85% efficient, what useful electric power could you produce with a bicycle-powered generator? B.) How many people would need to ride bicycle generators simultaneously to power a 255 W TV in the gym?

Explanation / Answer

Typical efficiency for body not given so assume as 25 %
A)
400 * 0.25 * 0.85 = 85 W ---- > Answer

B)
255 / 85 = 3 persons ---- > Answer

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