Did Nikola Tesla discover alternating current?

Tesla invented the alternating-current generator that provides your light and electricity, the transformer through which it is sent, and even the high voltage coil of your picture tube. The Tesla Coil, in fact, is used in radiOS, television sets, and a wide range of other electronic equipment - invented in 1891, no-one's ever come up with anything better.

Additional Answer

Tesla didn't invent alternating current, but it was he that advocated its use in electrical supply systems, when Edison was advocating direct current.