What were the most important electrical technology advancements of the 20th century?

It has been theorized that a Civilizations advancement is dependent on the improvement of all its aspects religion, sciences, politics etc. The advancement of one of these aspects is directly dependent on the others, determining the most important advancement eventually becomes a matter of opinion when the assumption that they are dependent is introduced. That being said the most significant advancements in "electrical" technology would most likely be, The transistor and the nanochip, the advancements made in the realm of computer technology have pushed humanity forward fairly quickly.