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 generator that is 90 % 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 270 W TV in the gym?

Explanation / Answer

here,

CASE A :
Power, P = 400 W
efficiency, n = 90% = 0.90
Typical efficiency of body, nb = 25% = 0.25

Useful power = Power * n * nb
Pu = 400 * 0.25 * 0.90
Pu = 90 Watt

CASE B:
No of persons = Power / n
no of persons = 270 / 90
no persons = 3 persons

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