Fundamental Concepts of Electricity Flashcards
what are the different types of electrodes
metal plate electrodes
carbon electrodes
self adhering single use or reusable electrodes
invasive electrodes
what is electrode surface area inversely related to
current density (amount of current per unit conduction area)
where should the electrode be placed
longitudinally over muscle bellies
over motor points if used for muscle stem
what is motor point
the location on the muscle where you can get the best motor response with the least stimulation
what is monopolar
one or more electrodes of the stimulation circuit is placed over the target tissue
what is bipolar
all electrodes of one circuit are placed affect the target area
what is qudripolar
electrodes from two or more circuits are positioned in the target area
what is the ground
a pathway of least resistance for current to flow
what is the waveform selector
allows for selection of the type of waveform you want delivered to the patient
what is analog control
rotary dials with continuous adjustments, may be not be linear
what is digital control
- push button type of controls that are pressure sensitive and increase in increments
what are amplitude controls
adjust the magnitude of the current voltage depending if its is a cc or cv machine and labeled intensity, amplitude or voltage
what happens if amplitude is increased
phase charge is increased and the physiological response
what is pulse duration
the time between the begining to the end of one phase of a pulse
what is pulse duration measured in
units of time in ms, for DC measured in ms
what happens if pulse duration increases
it will also increase phase charge of physiological response
what is frequency controls
selects the number of pulses or cycles per second
what is frequency control rated in
rate or pulse frequency
what does frequency determine
the type of contraction and is also elevated to fatigue
what does carrier frequency refer to
the number of cycles per second within a burst
