An introduction to electrical theory, REFG 121 will allow study of the theories of electricity with an emphasis on how these theories apply to the HVAC/R industries. It will begin by examining atomic theory and how to use this knowledge to explain electrical pressure, current flow, resistance and electrical power. There will be an emphasis on Ohm's Law, series circuits, parallel circuits and series-parallel circuits. The student will be instructed on electric meters and their usage. Transformers, Alternating Current and Power Distribution Systems will also be studied. The course will also provide instruction in the components, symbols and circuits used in the HVAC/R industry. Corequisite: REFG 123. (F)