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# E-stim Terminology

### terms associated with Electrical Stimulation

electrical current movement of flow of charged particles through a conductor in response to applied electrical field measured in amperes (A)
charge basic property of matter noted as Q measured in Coulombs (C)
polarity property of having 2 oppositely charged conductors
voltage electrical force capable of moving charged particles through a conductor between 2 regions measured in Volts (V) aka = Potential Difference
resistance Property of a conductor that resists, or is in opposition to the flow of charged particles. Resistance (R) is measured in Ohms Ώ
Ohm's Law V = I x R Voltage = Icurrent x Resistance
impedance The total frequency-dependent opposition to current flow. Impedance (Z) is measured in Ohms. For biological systems, Z describes the ratio of V to I more accurately than R because it is a frequency-dependent measure that includes capacitance and R.
Direct Current continuous unidirectional flow of charged particles (DC)
Alternating Current Alternating Current (AC) is a continuous bi-directional flow of charged particles AC has equal ion flow in each direction resulting in no net charge accumulation Wave length is one cycle ↑ frequency = ↓ cycle duration
Pulsed Current Discontinuous in a series of pulses which may be uni- or bidirectional [flow of charge is interrupted to create periods when no current flows]
monophasic pulsed current A series of unidirectional pulses. A net charge results.
biphasic current may be symmetrical or asymmetrical may be balanced or unbalanced
Interferential Current Waveform is produced by interference of two medium frequency sinusoidal AC of slightly different frequencies. Uses 2 channels, 4 electrodes, placed so AC currents intersect and interfere.
intensity aka = strength, power, or amplitude
Created by: jteich