Defined as the study of the mind and its behavior, psychology has broad applications in the modern world. The psychology degree is popular: the American Psychological Association states that psychology is the fourth most common major among U.S. students. Aside from academia, research and clinical counseling, a wealth of employment options exist.
rotating anode. focal track made of tungsten -rhenium which spins on the copper anode rotor and has molybdenum backing because these metals conducts it draws the heat away from the anode. - because the anode is rotating the electrons dont hit at the same spot everytime so the anode does not over heat. focal spot.
Most of the time a water heater makes a rumbling noise because it has a large build up of slush at the bottom of the tank. All water heaters have an Anode Rod. This rod is made up of zinc composites (normally) and its purpose is to react with the bad minerals in the water and neutralize them.