Flashcards in Electrotherapeutic Basics Deck (154)
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31
What is Ohm's Law
The amount of electromotive force in a circuit is equal to the current intensity multipled by the resistance
32
What is the equation of Ohm's Law
V=I*R
33
What does increasing the resistance do the the voltage to move current
Increases the voltage
34
What is a circuit that is in series
When the same current flows through each resister
35
What does total resistance equal in a circuit in series
Rt=R1+R2+...
36
What is a circuit that is in parallel
When current flowing through a circuit has multiple pathways to follow through or around each resister
37
What does total resistance equal in a circuit in parallel
1/Rt=1/R1+1/R2+...
38
What are the 3 basic electrotherapeutic currents
1. Direct (DC)
2. Alternating (AC)
3. Pulsatile or pulsed
39
What are the 3 types of direct/galvanic/monophasic current
1. Continuous
2. Reversed DC current
3. Interrupted DC current
40
What is continuous direct current
Unidirectional flow of electrical charges for at least one second
41
What is reversed DC current
Unidirectional flow of electrical charges for at least one second that then changes polarity
42
What is interrupted DC current
Unidirectional flow of electrical charges for at least on second that then stops for at least on second then resumes
43
What is direct current generally used for (3)
1. Iontophoresis
2. Stimulating denervated muscle directly
3. Stimulate wound healing
44
What is alternating/faradic/biphasic current
A continuous bidirectional flow of charged particles where each cycle duration occurs in less than one second with equal ion flow in each direction
45
What does equal ion flow in each direction cause during AC current
No net charge to be formed
46
What does the wavelength equal in AC current
One cycle
47
True or False:
In AC current wavelength and frequency are inversely related
True
48
What is AC current generally used for (4)
1. Muscle strengthening
2. Muscle re-education
3. Pain modulation
4. Functional training
49
What is pulsatile/pulsed current
Unidirectional flow of electrical current that lasts less than one second and stops for a finite period before the next pulse
50
How long is the finite amount of time that pulsed current stops for
Usually 5-999 milliseconds
51
What is a dumbed down way to explain pulsed current
Electric current delivered discontinuously separated by a finite period of time
52
What are the 2 types of pulsed currents
1. Monophasic pulsed current
2. Biphasic pulsed current
53
What are the 2 types of biphasic pulsed current
1. Symmetric
2. Asymmetric
54
What are the 2 types of asymmetric biphasic current
1. Balanced
2. Unbalanced
55
What makes the asymmetric biphasic current balanced and unbalanced
Balanced: The area under the wave is the same (so same charge) for both waves but different length of time
Unbalanced: The area under the wave is different (so different charge) but the length of time is the same
56
Does balanced or unbalanced asymmetric biphasic current result in the build up of current on one side
Unbalanced
57
What is the waveform
The shape of the current intensity vs. time graph
58
What are the possible number of phases (4)
1. Monophasic
2. Biphasic
3. Triphasic
4. Polyphasic
59
what are the possible symmetries of phases (2)
1. Symmetry
2. Asymmetry
60
