Grip vs. Electrical Department

What are 3 key differences between the grip and electrical department on set?  What is one thing from this video that adds to your understanding of what the grip department does?

    Three key differences between the grip and electrical department on set are their responsibilities, which is dependent on whether electricity, movement, and rigging is involved. Where the electric department is in charge of all things electricity, such as cables, generators, etc., the grip is in charge of more of the mechanical aspect, such as shaping the light. One responsibility of the grip department that the electric doesn't do is aiding the camera department with movement. Grips are often the people in charge of executing a camera movement such as a dolly, trucking, etc. Another difference between the departments is whether rigging is involved. Grips are who is responsibly for setting a lot of things up; if there is structures or equipment that is needed to be set up, it's often a grip's job to do so. One thing from the video which adds to my understanding of what the grip department does is that they mirror the electric department hierarchically.