Day 199 of 365
July 18
💻
Technology Solar Energy Technology
Solar panels convert sunlight directly into electricity using the photovoltaic effect, discovered in 1839. Panel efficiency has increased from about 6% in the 1950s to over 47% in laboratory conditions today. Solar is now the cheapest source of electricity in history in sunny regions.
💡 Did you know?
The sunlight hitting Earth's surface in one hour contains more energy than humanity uses in a year!
Take Knowly with you
Get daily lessons, create your own, and build your personal wisdom library
Download for iOS