terms associated with Electrical Stimulation
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| electrical current | movement of flow of charged particles through a conductor in response to applied electrical field
measured in amperes (A)
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| charge | basic property of matter
noted as Q
measured in Coulombs (C)
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| polarity | property of having 2 oppositely charged conductors
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| voltage | electrical force capable of moving charged particles through a conductor between 2 regions
measured in Volts (V)
aka = Potential Difference
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| resistance | Property of a conductor that resists, or is in opposition to the flow of charged particles.
Resistance (R) is measured in Ohms Ώ
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| Ohm's Law | V = I x R
Voltage = Icurrent x Resistance
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| 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.
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| Direct Current | continuous unidirectional flow of charged particles
(DC)
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| 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
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| 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]
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| monophasic pulsed current | A series of unidirectional pulses.
A net charge results.
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| biphasic current | may be symmetrical or asymmetrical
may be balanced or unbalanced
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| 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.
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| intensity | aka = strength, power, or amplitude
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jteich
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