electricity.txt

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Author:
jpowell22
ID:
110980
Filename:
electricity.txt
Updated:
2011-10-27 16:01:00
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maureen
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Description:
lecture 8 10-20-11
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  1. What is the movement of electrons?
    electricity
  2. All matter is composed of atoms that contain (+) and (-) charged particles called what?
    ions
  3. What are electrons?
    particles of matter possessing a (-) charge and very small mass
  4. What is the rate at which the charge moves past a given point?
    current
  5. Electrons move from areas of high potential energy to where?
    ares of low potential energy
  6. Ampere (amps) measure what?
    current
  7. What is intensity measured in?
    amps
  8. What is the range of mamp for imperceptible?
    0-1
  9. What is the range of mamp for tingling, muscle contraction?
    1-15
  10. What is the range of mamp for painful electric shock?
    15-100
  11. What is the range of mamp for cardiac fibrillation/respiratory arrest?
    100-200
  12. What is the range of mamp for rapid burning, destruction of tissue?
    +200
  13. What produces the flow of electrons and is measured in voltz?
    electromotive force (EMF)
  14. Electromotive force is referred to as what?
    potential energy sitting there
  15. What is voltage?
    strength of current (pressure)

    amount of current through the wire=pressure
  16. What is considered low voltage?
    150 voltz
  17. What is considered high voltage?
    +150 voltz
  18. What are materials that offer little oppostion to current flow?
    conductor
  19. Conductors are good at what?
    passing on electricity
  20. Metal&water, blood&muscle, and the nerve system are examples of what?
    conductors
  21. What is material that resists current flow?
    insulators
  22. rubber, wood, plastic, skin, bone, and tendons are examples of what?
    insulators
  23. What is resistance?
    opposition to electrom flow

    electrical impedence

    measured in OHMS
  24. What is OHMS law?
    current flow = voltage/resistance

    rate of flow = electromotive force/opposition to current
  25. What are watts?
    voltz X amperes

    measure of electrical power
  26. What are two types of electrical current?
    D.C. (direct current)

    A.C. (alternating current)
  27. What are some other words for direct current?
    galvanic, monophasic, uni directional
  28. What are some other words for alternating current?
    faradic, biphasic, 2 directions
  29. What are 3 types of DC/AC current?
    continuous, interrupted/modulated, surge
  30. What is an alteration in current flow (shape, direction, amplitude, duration)?
    waveforms
  31. What is amplitude?
    reflects intensity of current (by height)
  32. What reflects the rate of current?
    frequency
  33. What happens to tissues if amplitude or frequency increases?
    increased excitability of tissues
  34. What is a circuit?
    path of current from power source through components back to source
  35. What circuit has the power drawn off at each link? All devices are either on or off.
    series circuit
  36. What circuit has each appliance directly connected to the + or - charge and the appliance completes the circuit?
    parallel circuit
  37. What is advantage?
    you can disconnect on appliance without interrupting the flow to others and each appliance gets the full voltage
  38. What circuit decreases by each appliance that draws on it?
    series circuit
  39. What are 4 ways to alter OHM's law?
    • 1. abrade area/skin
    • 2. apply HP
    • 3. clean with alcohol
    • 4. clip or shave hair
  40. What do you need to decrease in order to make e stim more effective? (OHM's law)
    impedence
  41. What are the 2 polar effects seen with direct current (galvanic)?
    anode- positive electrode

    cathode-negative electrode
  42. What electrode is normally seen as red, has cold effects, attracts acids (-), and repels alkaline (+)?
    anode
  43. What electrode is seen as black, has heat effects, repels acids (-), and attracts alkaline?
    cathode
  44. What electrode has a sclerotic effect, causes vasoconstriction, and decreases hemorrhage and metabolism?
    anode
  45. What electrode has an anti-sclerotic effect (softens tissues, good for scar tissue), causes vasodilation, and in creases hemorrhage and metabolism?
    cathode
  46. What electrode decreases tissue excitability, and nerve irritability (used for pain relief), has a weaker contraction, and decreases pain in acute stages of inflammation?
    anode
  47. What electrode increases excitability of tissues, and nerve irritability (used for increased contraction force), has a stonger contraction, and dispels fluids by increasing circulation and stimulating absorption?
    cathode

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