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 typical person can maintain a steady energy expenditure of 400 on a bicycle.
a) Assuming a typical efficiency for the body and a generator that is 80% 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 400 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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