Term
| The three things that need to be present for electricity to flow. |
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Definition
| EMF, different in potential, and a circuit. |
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Term
| How much current flows in a circuit depends on two things. |
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Definition
| EMF and the amount of resistance in the circuit. |
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Term
| the two most commonly used sources used to produce an electrical current |
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Definition
| Chemical and mechanical/magnetic |
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Term
| what type of electricity does a chemical produce. |
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Definition
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Term
| what type of electricity does a mechanical/magnetic source produce. |
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Definition
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Term
| what two modalities use Direct current? |
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Definition
| motor point and iontophoresis. |
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Term
| what type of electricity current do we use in generators and home outlets? |
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Definition
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Term
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Definition
| characteristic of current that we can adjust. |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| total amount of time the current is on |
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Term
| pulse duration or pulse width |
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Definition
| duration of each individual pulse |
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Term
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Definition
| how long each pase stays on; "phase" is just the top or just the bottom also expressed in milliseconds or microseconds. |
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Term
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Definition
| how often the pulses or cycles occur. |
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Term
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Definition
| speed of increase or rise to maximum intensity |
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Term
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Definition
| speed of decrease or fall from maximum intensity |
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Term
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Definition
| decay time from maximum intensity |
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Term
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Definition
| refers to the gradual rise in a series of pulses |
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Term
| characteristics of a direct current |
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Definition
1.current flows in one direction the entire time it is on.
2.On pole or electrode is negative
3.one pole or electrode is positive
4. current flow is from cathode to anode
5. polarity is constant- either always negative or always positive.
6.there is a build-up of charges at each pole. |
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Term
| characteristics of a alternating current |
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Definition
1.current periodically flows in opposite directions.
2. each pole or electrode switches from being positive to negative at regular intervals
3. current flows from cathode, to anode, then back to cathode, then back to anode and so on.
4.polarity is not constant
5.there is no build-up of charges under the poles.
6.there is a continuous change in magnitude with a periodic change in direction. |
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Term
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Definition
| the manner in which a current varies in magnitude and direction at every instant, or what the full cycle looks like. |
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Term
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Definition
| the portion of a wave which rises to maximum and returns to baseline. |
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Term
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Definition
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Term
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Definition
| one cycle. either symmetrical or asymmetrical. |
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Term
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Definition
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Term
| frequency for direct current and pulsatile current |
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Definition
| pps for both and bps for pulsatile current. |
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Term
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Definition
| time between unis of current. |
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Term
| three types of wave forms |
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Definition
square wave
sine wave or sinusoidal
pulsed waveform |
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Term
| two types of square waves |
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Definition
| A.C square waves and D.C. square waves |
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Term
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Definition
instantaneous rise in current intensity.
flow maintained at max. intensity for half the cycle.
instantaneous drop in current intensity to zero.
reversal of e- flow |
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Term
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Definition
instantaneous rise in current intensity.
maintained at this level certain pulse duration.
instantaneous drop in current intensity to zero.
no reversal of e- flow |
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Term
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Definition
gradual rise in intensity.
gradual fall in intensity
reversal of e- flow |
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Term
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Definition
rapid rise in intensity to maximum.
stays at peak briefly, then rapid fall in intensity back to zero.
reversal of e- flow.
rises to peak intensity instantly in opposite direction, then returns to zero.
asymmetrical waveform |
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Term
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Definition
rapid rise in intensity to maximum.
immediate rapid fall in intensity back to zero.
no reversal of e- flow. |
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Term
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Definition
| changes; variations in the waveform over a period of time. |
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Term
| different aspects of the waveform that may be modulated |
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Definition
| intensity (amplitude), the rate (frequency), and the duration (pulse or phase). |
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Term
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Definition
| gradual increase to maximum level of intensity. |
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Term
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Definition
| number of surges per minute |
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Term
| used for pain relief and motor point stimulation |
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Definition
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