Lemon battery Lemon battery A lemon battery is a simple battery often made for the purpose of education. Typically, a piece of zinc metal (such as a galvanized nail) and a piece of copper (such as a penny) are inserted into a lemon and connected by wires. Power generated by reaction of the metals is used to power a small device such as a light emitting diode (LED). The lemon battery is similar to the first electrical battery invented in 1800 by Alessandro Volta, who used brine (salt water) instead of lemon juice. The lemon battery illustrates the type of chemical reaction
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