There are many different ideas about this subject, but in my opinion the greatest invention in history is electricity. It was invented in last part of 17th century. We have been using it in our whole life effectively. When we have a small cut in our electrical lines, we feel it’s absence very harsh. Because our all utensils which is powered by electricity, are very important in our works and households. With the advancement in technology we have started to use electrical cars and even flying cars which are powered by electricity. The other important fact about electricity is that it can be supply by different resources like renewable ones. Not only limited resources like fuel and gasoline, but also renewable ones like wind and solar powers can be used to supply our electricity need. In our era I don not image a life without electricity. So that it’s invention is the biggest step to our civilization and advancement in technology.