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.
Diode is a two terminal device (di-means two). Simply put, it acts as a one-way valve for electrons. Conventional current can flow from the anode to the cathode, but not in the other direction.If an intrinsic semiconductor is doped with a pentavalent or trivalent impurities you get a diode. Selenium diodes work much like any other diode. They allow current to flow in a forward direction and block current from flowing in the opposite direction. They have a h â¦ igher forward bias voltage then silicon and as such generate much more heat then a comparable silicon diode.