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.
Two Methods: Examining the Markings Using a Multimeter. A diode is a two terminal electronic device which conducts current in one direction and blocks current in the opposite direction. A diode can also called a rectifier, which converts AC to DC. Since diodes are essentially one-way, it's important to know how to determine which end is which.