aNikola Tesla is one of the greatest electronic engineer in United States. he invent alternating current to make people's life better and better. now people's life can't without electricity ,but it is too dangerous, so we must use electricity carefully. besides,electricity also have many adva...
aNikola Tesla is one of the greatest electronic engineer in United States. he invent alternating current to make people's life better and better. now people's life can't without electricity ,but it is too dangerous, so we must use electric carefully. besides,electricity also have many ...