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Current issue

ELEKTRO 7/2019 was released on June 26th 2019. Its digital version will be available on July 26th 2019.

Topic: Cables, conductors and cable engineering, Tools, equipment and accessories for work with cables

Main Article
Asset management and diagnostic needs in Industry 4.0

SVĚTLO (Light) 3/2019 was released on June 11th 2019. Its digital version will be available on July 15th 2019.

Fairs and exhibitions
Euroluce 2019 by designers eyes
Exhibition Light in architecture 2019
Amper 2019 in capture of sophisticated technologies

Refreshing our memory
Lighting glass from Kamenný pahorek

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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