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.
Diodes are small cylindrical shaped components which are consisted of two leads, the Anode and the Cathode. The Cathode is the striped side of the diode. Usually a diode is black in color with a gray stripe, marking the Cathode side of the diode. Current will flow through a diode in one direction only. When the Anode side of the diode is facing towards the positive source of voltage, it will allow the circuit to be completed, and is considered Forward Biased.