Which way does electricity flow (positive/negative) and which side of the symbol for a battery is plus?
Electrons flow from the negative terminal to the positive terminal. When electricity was first discovered they didn’t really have a way of telling which way it was flowing so they made a guess. As it turned out, the guess was wrong. When an electron moves from one position to another it leaves a “hole” behind. Another electron flows in and fills this hole, leaving its own hole further down the line. So in practice although electricity can be considered as a stream of electrons flowing from negative to positive, it can be equally considered as a stream of “holes” flowing from positive to negative. To answer your second question, the small bar is positive and the large bar is negative. I like to think of the symbol as being a battery…the small bar is the little bump on the battery’s positive end while the long bar is the large flat area on the negative end of it.
