Electrotherapeutic Basics Flashcards Preview

Phys Agents > Electrotherapeutic Basics > Flashcards

Flashcards in Electrotherapeutic Basics Deck (154)
Loading flashcards...
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

What are the possible balances of charge (2)

1. Balanced
2. Unbalanced