Definition of busy. busier. ; busiest. 1a : engaged in action : occupied She's busy studying. has enough work to keep him busy for a whileb : being in use found the telephone busy. 2 : full of activity : bustling a busy seaport.
It is considered a high quality tube, and is normally constructed from SAE 1020 or 1026 steel. Note that, technically DOM refers to the process by which the tube is finished after having started as an ERW tube. Technically, DOM is not a type of steel tube, but rather a process. As so often happen though - in common use the term has become accepted to mean a specific type of tubing rather than a process.
A small metal or plastic shaft potentiometer or pot is a variable resistor. By connecting battery across the two ends one get variable voltage at the wiper. Hence it is called potentiometer. A carbon deposit is used as resistor in this case or wire wound potentiometers are also are available. In the second type of potentiometer wire of 1m, 4m or 10 m are used as potential divider. The wires are stretched across a wooden base.