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
NZR RM class (Edison battery-electric) NZR RM class (Edison battery-electric) The NZR RM class Edison battery-electric railcar was a popular and successful railcar that ran in Canterbury, New Zealand for eight years. The prototype, RM 6, was arguably the first successful railcar in New Zealand, but the type was not developed into a class. The railcar had a wheel arrangement of Bo-Bo under the UIC classification system, weighed , had driving controls at each end, and with an engine output of , it travelled comfortably at . In appearance, it looked like a cross between a regular railway passenger carriage and a tram; side-on, it