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Current issue

ELEKTRO 12/2016 was released on December 7th 2016. Its digital version will be available on January 6th 2017.

 

Topic: Measurement, measuring devices and measurement engineering; Testing and diagnostics

 

Main Article

Lithium traction batteries for electric mobility (final part 2)

SVĚTLO (Light) 6/2016 was released on December 5th 2016. Its digital version will be available on January 5th 2017.

Interiors lighting
Colloquium Interiors 2016 – the fifth anniversary
Cooperation of indoor interior and lighting 

Standards, regulations and recommendations
New standards for road lighting

Photovoltaics Discovered In 1875

06.01.2015 | |

 These days we are celebrating the UN’s 2015 Year of Light. Physicist John Perlin explains an excellent archive for any person wishing to keep abreast of today’s solar revolution.


The year: 1872. It was this discovery that stirred keen interest in two British scientists, William Grylls Adams and Richard Evans Day. Adams and Day had received from Smith the bars of selenium he had experimented with. Their goal? To delve deeper into the peculiar behavior Smith had discovered.


In one experiment, Adams and Day passed a battery-generated current through the bars. After detaching the battery from the selenium, they discovered to their astonishment that the induced current had reversed itself. To see if light would have the same effect as the battery had, the the two scientists placed candlelight close to the selenium. The flame forced the current to flow in the opposite direction as if it were a battery.


They therefore knew they had discovered something previously unknown to science – that a current could be started by the action of “light alone” in a solid-state material.The two scientists called the flow of electricity caused by light, “photoelectric.” Today, we say, “photovoltaic.” So began in 1875 the first stirrings of today’s solar revolution.

read more cleantechnica.com

Image credit John Perlin: Let It Shine

 

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