Pa, PA or pa may stand for: File links The following pages link to this file: Alchemy Ada Adventure Apartheid Abbreviation Airplane (disambiguation) Abduction Alder Anno Domini Air ABC (disambiguation) Ad hominem Afghan AD Aether Aba Anus Affinity Ai AZ Albinism Accumulator Binary Chess Computer Carbon Cow Cricket (disambiguation) Collection Convex Culture Ceramics Case Creation Crow (disambiguation... Wiktionary full URL is a sister project to Wikipedia intended to be a free wiki dictionary (including thesaurus and lexicon) in every language. ...
PA is also the short form for the PA-RISC family processor architecture from Hewlett-Packard
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The PA system is controlled from a mixer which blends the incoming signals from microphones and musical instruments, modifies the tone, and controls the overall level of the signal that is sent to the amplifier.
All PA systems have a potential for feedback, which occurs when sound from the speakers returns to the microphone and is then re-amplified and sent through the speakers again.
PA speakers have been made lighter by using neodynium speaker magnets, and horns are often wired using fuses or other circuitry that protect the horn from damage if feedback occurs.
Because of the close working relationship PAs have with physicians, PAs are educated in a medical model designed to complement physician training. PA students are taught, as are medical students, to diagnose and treat medical problems.
A PA's education doesn't stop after graduation, though. PAs are required to take ongoing continuing medical education classes and be retested on their clinical skills on a regular basis. A number of postgraduate PA programs have also been established to provide practicing PAs with advanced education in medical specialties.
The relationship between a PA and the supervising physician is one of mutual trust and respect.
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