Did Nikola Tesla discover electricity

Answer 1

No, electricity was known long before Tesla's time, although he was one of the pioneers in its use and in some of the more advanced ideas about its interactions.

Various scientists throughout the two or three centuries preceding him had established the basis of knowledge about electricity; the term itself was created in 1600. Many of the various types of electricity were defined both on their own and in relation to other phenomena like lightning and magnetism (via electromagnetic effects).