Ultrasound technicians may expect to perform some of their work in rooms with low lighting. They can expect to be on their feet for a majority of their work time, and must be able to do some lifting or turning of patients who require assistance.
semiconductor diode A diode made of semiconductor components, usually silicon. The cathode, which is negatively charged and has an excess of electrons, is placed adjacent to the anode, which has an inherently positive charge, carrying an excess of holes. At this junction a depletion region forms, with neither holes nor electrons.
First, what is a diode? A diode is a semiconducting device, that allows current to flow in one direction but not the other. A semiconductor is a kind of material, in this case silicon or germanium, whose electrical properties lie between those of conductors (metals) and insulators (glass, rubber).hen the voltage across the diode is positive, a lot of current can flow once the voltage becomes large enough. When the voltage across the diode is negative, virtually no current flows. 1  N-type: With N-type doping, phosphorus or arsenic is added, in parts per billion, to the silicon in small quantities.