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2014-12-10 17:50:09

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  1. what is direct current
    It has constant ____
    • is electricity flowing in a constant direction
    • polarity
  2. What is alternating current
    Reverses positive and negative charges over time alternating polarity/voltage back and forth
  3. which current is good for production of heat
    Direct current
  4. Which current is good for electric generators motors and power distribution and is more fficient for high power applicaitons
  5. what is mutual induction
    • An effect of electromagnetism whereby two or more coils of wire placed so that the
    • changing magnetic field created by one induces a voltage in the other
  6. transformer
    • A transformer is a pair of mutually-inductive coils used to convey AC power from one coil to the other. Often, the number of turns
    • in each coil is set to create a voltage increase or decrease from the powered
    • (primary) coil to the unpowered (secondary) coil.
  7. three common transformers:
    auto-transformers, step-up and step-down Transformers.
  8. What are autotransformers used for
    for control of incoming current and voltage to compensate for fluctuations
  9. what does a stepdown transformer do
    decreases the energy to a level required to power the filament
  10. what does a step up transformer do
    is used to increase the operating voltage to a level rquired for producing radiation or  anode disk
  11. autotransformers are aka
  12. what is the difference between the primary coil and secondary coil
    • ac voltage is supplied across the primary coil
    • ac voltage is induced in the unpowered secondary coil
  13. what are the two sets of windings on the step up and step down transformers that are electrically isolated from each other
    • on set connected to the power supply is the primaries 
    • other set of windings is connected to the tube and is referred to as secondary windings
  14. what is the control unit
    it is used to control the energy coming into the tube ma kv and a timer
  15. th ma control in an xray system includes what
    a rheostat connected to the circuit that allows adjustment in tube current
  16. what are the three main parts to an xray generator
    • tube high volt power 
    • and control unit
  17. what are the three things used to produce an xray
    source of electrons a means of acceleration and a target for interaction
  18. what are the different types of energy
    heat chemical kinetic potential sound light electromagnetic
  19. what is the requirement for electrons to pass between the anode and cathode
    potential difference
  20. alternating current reverses its direction of flow how many times per second
  21. Is xray beam hetero or homo
    hetero because HETEROgenous X-ray beam would have radiation consisting of different frequencies, various energies, or a variety of particle
  22. what is the mean of the heterogenous xray beam
    30-40% of kvp
  23. when dealing with electric power in a single phase voltage always starts at what
  24. If there are two pulses per cycle and there are 60 cycles per second –
    How many total pulses are
    there in one
  25. in a 3phase electric power how many alternating currents are there 
    each interval is separated by how many degrees
    • 3
    • 120 deg
  26. a three phase has a _______ voltage source 
    what is the percentage of 3 phase 6 pulse and 12 pulse ripple factor
    • constant 
    • 13.5% - 6 pulse ripple factor 
    • 3.5% - 12 pulse
  27. which has greater number of diagnostically useful xrays 1 phase or 3 phase
    3 phase
  28. which has an increase of patient dose lower average energy and increased exposure time
    single phase
  29. which phase has higher average eneergy, reduces exposure time and a reduction in patient dose
    3 phase
  30. what is the single phase limit in tube current (ma)
    how about for 3 phase
    • 300-500mA
    • 1000-2000 ma
  31. what is rectification
    is the process of using negative portions of the cycle in the production of xrays
  32. the higher the ripple the higher the ____
  33. how many rectifiers are in a full half and self rectification circuit
    • full wave minimum of 4 
    • half wave 0 
    • self rectification 0
  34. transformers can ______ or ______ voltage
    increase or decrease
  35. What is newtons first law of motion
    an object in motion tends to stay in motion and an object at rest tends to stay at rest unless acted upon by an unbalanced force
  36. inertia is:
    the more ____   an object has the more inertia it has
    • the tendency of an objected to resist changes in its state of motion 
    • mass
  37. what law states that all objects have inertia
    First law of sir isaac newton
  38. What is newtons second law
    force equals mass times acceleration
  39. what is acceleration
    a measurement of how quickly an object is changing speed
  40. what is newtons third law
    for every action there is an equal and opposite reaction
  41. what is kinetic energy 
    what is potential energy
    the energy of motion like a rubberband flying through the air or water falling 

    energy that is store in object which can be converted to kinetic energy like pulling a rubber has pt energy and flinging in air it now has kinetic energy (motion)
  42. the autotransformer has only one _____
  43. the step up transformer has ____ turns on the ____ side
    more, secondary
  44. what is the purpose of a high voltage transformer
    to increase voltage

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