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 W on a bicycle. Assuming a typical efficiency for the body and a gerator that is 85% efficient, what useful electric power could you proudce with a bicycle-powered generator?

P=???

B) How many people would need to ride bicycle generators simultaneously to power a 340 W TV in the gym?

N=???

Explanation / Answer

A)
400 * 0.25 * 0.85 = 85 W

B)
340 / 85 = 4 persons

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