Basic Principles of Electricity

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When is E. Stim used in Physical Therapy
- Treat neuromuscular conditions
- Enhance local circulation
- Promote tissue healing
- Decrease pain
- Increase ROM
Define Electrical Current
- Movement or flow of charged particles (electrons/ions) from one place to another
- Amount of current depends on # of electrons/ions passing a given point per unit of time
How is current messured
- 1amp = 1 coulomb
- Milliamp 1,000th mA
- Microamp 1,000,000uA
Define Electromotive Force
- a difference in potential is established when the amount of charge at one end of the ciruit os greater thean the other end
- The difference in potential is called volts
Define Anode
- Positvie side of the circuit
- Attact negative charges
Define Cathode
- Negative end
- Attracts positive
How an action potention is created
- Excitation occurs principally at the cathode
- near cathode(-) field attracts Na (+) ions
- decreases the positive charge on the outside of the membrane and leads to excitation
What way does electrical current flow?

elctrons flow from neg to pos
Describe Direct Current
- Constant unidiretional flow of electricity
- Same charge the whole treatment
- DC can induce chemical reaction in the body
- Negative charge increases chance for burns
- Positive is safer
Describe Alternating Current
- Changes it's direction of flow periodically
- No net chemcial reactions occurs - safer
Define Conductor

material with less reistance and readily allow current to pass
Define Insulator

high resistnace and impede passage of current
Resistance
- current will take the path of least resistance
- current does not create a unifor pathway through all tissue
- Increases intestisty to get to nerves
- Larger fibers are more easily stimulated (A-beta first)
Describe Impedance
- Resitance to Electrical Current
- muscle 72-75% water
- Fat 14-15%water
- bone 5-16% water

Author

hgienau

67531

Card Set

Basic Principles of Electricity

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mod

Updated

2011-02-20T02:59:16Z

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