Definition of aspect for Students. 1  1 : the appearance of something : look The old house took on a dark and lonely aspect at night. 2  2 : a certain way in which something appears or may be thought of We considered every aspect of the question. 3  3 : a position facing a certain direction The house has a southern aspect.
Knob and tube wiring is the original wiring method used from the late 1800s until approximately 1945. It is a system that involved stringing individual conductor insulated wire across porcelain insulators called âknobs,â and through other porcelain insulators called âtubes.â.
The vacuum diode tubes are classified as. 1  Frequency range wise (audio, radio, microwave) 2  Power rating wise (small signal, audio power) 3  Cathode/filament type wise (indirectly heated, directly heated) 4  Application wise (receiving tubes, transmitting tubes, amplifying or switching)