Electrical engineering credited with establishing the term "electricity". He also designed the versorium: a device that detects the presence of statically charged objects. In 1762 Swedish professor Johan Carl Wilcke invented a device later named electrophorus that produced a static electric charge. By 1800 Alessandro Volta had developed the voltaic pile, a forerunner of the electric battery In the 19th century, research into the subject started to intensify. Notable developments in this century include the work of Georg Ohm, who in 1827 quantified the relationship between the electric current and potential difference in a conductor, of Michael Faraday (the discoverer of electromagnetic
Battery electric multiple unit rail. A Combino tramway using four car tramsets equipped with the Sitras HES system has been in regular service from Almada to Seixal, Portugal, since November 2008. It is capable of running up to distances of 2,500 metres without overhead wires. The 20.3km Huai'an tram line in China, opened in February 2016. The line is entirely catenary-free utilising battery-powered trams supplied by CRRC Zhuzhou which recharge at tram stops. The Austrian Federal Railways has purchased at a cost of $1.9 billion 300 Bombardier Talent 3 trains, the battery/electric version of the Talent 2 equipped to operate with batteries and overhead