Keep going! Check out the next lesson and practice what you’re learning:
https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:energy-resources-and-consumption/x0b0e430a38ebd23f:fuel-types-and-uses-ii/e/fuel-types-and-uses-ii

Passive solar energy systems absorb heat directly from the sun without the use of mechanical and electric equipment, and energy cannot be collected or stored. Active solar energy systems use solar energy to heat a liquid through mechanical and electric equipment to collect and store the energy captured from the sun. Photovoltaic solar cells capture light energy from the sun and transform it directly into electrical energy. Their use is limited by the availability of sunlight.

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Credits:

“Greenroof” by pnwra [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Green_Roof_(460698511).jpg

“Santa Fe adobe” by Carol m [Public domain], via Wikimedia Commons:
https://en.wikipedia.org/wiki/Adobe#/media/File:Santa_Fe_adobe.jpg

“Home awnings” by Conarty [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Home_Awnings.jpg

“Thermal solar collector” by Norbert Nagel [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Solar_heating_system_-_Thermosolaranlage_-_M%C3%B6rfelden-Walldorf_-_Germany.jpg

“Ivanpah” by Craig Butz [Public domain], via Wikimedia Commons:
https://en.wikipedia.org/wiki/Ivanpah_Solar_Power_Facility#/media/File:Ivanpah_Solar_Power_Facility_from_the_air_2014.jpg

“Heliostats” by Alexchris [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Type_of_Concentrated_solar_power.png

“Mersin CSP field” by Kohsman [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Mersin_CSP_field.jpg

“Solar calculator” by Rfassbind [Public domain], via Wikimedia Commons:
https://commons.wikimedia.org/wiki/File:Solar_calculator_casio_fx115ES_crop.jpg

Seeing how energy and matter flows and is recycled from primary producers (autotrophs) to primary, secondary and tertiary consumers.

Watch the next lesson: https://www.khanacademy.org/science/biology/ecology/biogeochemical-cycles/v/biogeochemical-cycles

Missed the previous lesson? Watch here: https://www.khanacademy.org/science/biology/ecology/intro-to-ecosystems/v/ecosystems-and-biomes

Ecology on Khan Academy: Why are polar bears found only in the Arctic? Why does mildew grow in your shower and not (hopefully) in your sock drawer? Learn how ecologists study the interactions between organisms and their environment, and how these interactions affect where, and in what numbers, different types of organisms are found.

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We’ve also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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