An electric keyboard has:36 white pieces and 25 black pieces a piano has a multitude more. Also a keyboard has various sounds and is able to replay famous songs such as Fur Elise depending on which...
Thefirat electric keyboard piano was invented by a man named Jack Genriona. He invented it when he was 36 years old. He worked for a week in a labotory in Iggelwood, California.
Depends how high and hard you crank up the electric piano. Also depends on what kind of pianos they are. But acoustically a normal piano will have the same volume if not more than an electric one.