Intro Electrotherapy Flashcards
(32 cards)
1
Q
Charge
A
- No of free electrons that atoms lose or gain
2
Q
Gaining electrons makes an atom more
A
negative
3
Q
positive ion
A
cation
4
Q
negative ion
A
anion
5
Q
cations are attracted to
A
cathodes
6
Q
cathodes are what charge
A
negative
7
Q
anions are attracted to
A
anodes
8
Q
anodes are what charge
A
positive
9
Q
unit of measurement for charge
A
Coulumb
10
Q
Current
A
- Movement of charged particles
- Response to an applied electric field
- Opposite flow of electrons
11
Q
unit of measurement for current
A
ampere (1 C/s)
mA for stimulators
12
Q
voltage
A
- Electromotive force or electrical potential difference
- Diff between positive and negative charges
- Driving force that makes particles move
13
Q
Resistance
A
- Opposition to movement of DC
- Ohm
14
Q
Ohm’s law
A
I = V/R
15
Q
impedance
A
- Opposition to movement of AC
16
Q
forms of resistance
A
○ Circuit stimulator (resistive, capacitive, inductive)
○ Skin surface (resistive, capacitive)
17
Q
Conductance
A
- Ease with which a material allows current to flow
18
Q
unit of measurement for conductance
A
○ Mho
○ Siemens
19
Q
Capacitance
A
- Ability to store charge using electrostatic field
20
Q
unit of measurement of capacitance
A
Farad
21
Q
Capacity =
A
charge/voltage
22
Q
Inductance
A
Ability to store electrical energy through electromagnetic field
23
Q
unit for inductance
A
henry
24
Q
Power source can be
A
- Batt operated or direct line
25
pros & cons of batt power source
○ Small stimulator
○ Portable
○ Not reliable source
○ Limited options
26
pros & cons of direct line power source
○ Stable power
○ More controls
○ Not portable
27
function of output amplifier
- Setting intensity
28
between constant current and constant voltage which is more common
constant current
29
duration for pain relief
20 mins
30
duration for atrophy
10 mins
31
duration for re-education
1-15 mins
32
pro of constant voltage
- Lower internal resistance <50 ohm
| - Auto reduction of current (safe)
