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 in science today we will talk about ac and dc power is powerful in short places. because it loses power faster over long distances this person called Robert tesla or something like that. invented a new type of electricity he worked for Thomas Edison but Thomas Edison wanted to keep dc power. because he said it was safer so Mr tesla quite angrily then went to this person rival. he went to Thomas Edison's rival and they used his new type of electricity. and they utterly destroyed Thomas Edison I the race for more electricity and more efficiency now all power sources are run by this power called ac electricity.