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A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time: (a) How many people would it take to run a 4.00-kW electric clothes dryer? (b) How many people would it take to replace a large electric power plant that generates 800 MW?
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Final Answer
  1. $40 \textrm{ people / clothes dryer}$
  2. $8\times 10^{6}\textrm{ people / power plant}$
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OpenStax College Physics Solution, Chapter 7, Problem 32 (Problems & Exercises) (1:03)

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