Date:
1870
 
Category:
Electricity
 
Location:
United States  
 
Event:
Heinrich Hertz used Edmond Becquerel's discoveries (of 1839 that certain materials produced small amounts of electric current when exposed to light) to study light's effects on solids, such as selenium, in the 1870's. Not long after that, selenium photovoltaics cells were converting light to electricity at 1% to 2% efficiency. From this research came the use of selenium in the field of photography as a light-measuring device.

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