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In the US the standard height of a utility pole is 40 feet, and is buried six feet into the ground. The tallest utility poles have reached 120 feet because of clearance requirements in the area.
The two main factors are the frequency and the number of poles of the motor. A formula for RPM is HZ x 60 x 2/ number of poles the motor has.
7 [ft] ..............refer to NESC for details
The first electric garage door opener was invented by C.G. Johnson in the year 1926 in India, Hartford City. Before that the electric garage door opener wasn't very popular.
Electrons are a negative charge. Using conventional notation current flows from positive to negative poles of a battery, for example. In electron flow convention the electrons flow from negative to positive.