This video describes the correct symbols to use for circuit common and earth ground and connections to an enclosure or chassis. Grounding of laboratory instruments is described and demonstrated. The operation of a Ground Fault Circuit Interrupter is explained and demonstrated. Electro Magnetic Interference (EMI) from a switching power supply is shown.
The general configuration of the AC power circuit feeding structures in the USA is diagrammed and explained.

Here is a link to a video showing the internal parts of a GFCI ;
   • Teardown: Leviton Ground fault circui...  

Here is a link to a video providing detailed information on the AC power system in buildings in the USA.
   • When and Why to Separate Grounds and ...