squirrely2005 Aug 26, 2011 Texas. From what I understand a pint is 16 ounces. I learned that from drinking Busch while living with my dad a few years ago. It just hit me the other day that I have a few glasses that are pint glasses but pouring a 12 ounce beer in them basically fills it up.
Hans Christian Oersted. In 1820, a Danish physics teacher observed that the current moving through a wire moved the needle on a nearby compass. when the current was reversed, the compass needle was deflected in the opposite direction. these magnetic effects ceased when the current in the wire stopped.
I'm not sure what was meant by whoever told you that the direction of the electrons is generally unknown. On average, the electrons move from negative to positive electrical potential in a DC circuit, as you said. Perhaps what they meant is that if you pick a particular electron and look at its velocity, it could be in any random direction. That's because the electrons are constantly bouncing off of each other and the atoms in the wire, causing the energy losses known as electrical resistance (also called Ohmic losses). So at any given moment, the actual direction of an individual electron is random.