Green Plumbing

Category - Caring for Our Planet

All of the following are active (as opposed to passive) techniques for converting solar energy into useful outputs, except:
  1. Fans
  2. Orienting building to the sun
  3. Photovoltaics
  4. Solar thermal collectors
Explanation
Answer: B - Orienting a building so that it benefits from exposure to sunlight is a passive, rather than active, technique for solar energy conversion. The other three responses all use mechanics and/or technology to direct the sun’s energy into other purposes - primarily electricity.
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