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
Plug-in electric vehicles in the United States a vehicle which draws propulsion energy from a traction battery with at least 5 kwh of capacity and uses an offboard source of energy to recharge such battery. The tax credit for new plug-in electric vehicles is worth plus for each kilowatt-hour of battery capacity over 5 kwh, and the portion of the credit determined by battery capacity cannot exceed . Therefore, the total amount of the credit, between and , will vary depending on the capacity of the battery (4 to 16 kWh) used to power the vehicles. The qualified plug-in electric vehicle credit phases out for a plug-in