Modalities Ch. 16 Flashcards Preview

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Flashcards in Modalities Ch. 16 Deck (62)
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1

electricity

form of energy that is produces by the accumulation and/or the movement of electrons

2

requirements for electron flow

electrons
path or conductor
force to push electrons

3

types of electricity

static
current

4

static

frictional
-two objects rubbing together
-electrons transferred from one object to another

5

currnet

electrons traveling along a conductor
-can be direct or alternating

6

measures of electrical charge

coulomb (Q)
amperage (A)
voltage (V)
resistance (R)
-ohm
--material
--length of circuit
--cross sectional area
--temperature

7

coulomb

measure of electrical charge
quantity of electrons
6.25 x 10^18

8

amperage
-A=

speed at which a current is flowing
-1 coulomb past a point in 1 second

9

voltage
-in modalities

electromotive force
difference of energy at one point to another
in modalities
-want it to be as low as possible while still achieving the desired effects

10

resistance

1 amp past 1 ohm
ability of a substance to oppose a current

11

ohn

measure of the resistance to electrons

12

resistance factors

material
length of circuit
cross sectional area
temperature

13

material in body

blood and nerves have lower resistance (more electrons)
skin and bones have higher resistance

14

length of circuit

the shorter the circuit, the less resistance

15

cross sectional area

the larger the area the less resistance

16

temperature

increased temperature equals increased flow of electrons
-decreases resistance

17

water-electricity flow analogy

table in book

18

Ohm's Law

current (amps)= voltage/resistance
-A = V/R
volts = current x resistance
resistance = voltage/current

19

current types

direct current
alternating current
pulsed current

20

direct
-alternate name

continuous flow of electrons in one direction
-pulse greater than one second
galvanic current

21

alternating current

continuous flow of electrons in alternating directions
-IFC is a series of alternating current coming together

22

pulsed current

interruption in flow

23

pulse and cycle characteristics

pulse named by number of phases
-monophasic
-biphasic
-polyphasic

24

monophasic

one phase
current flows in one direction only

25

biphasic

two phases
current flows in both directions

26

polyphasic

multiple phases

27

quantitative characteristics

amplitude
-distance from baseline to top of wave

28

peak vs. average amplitude

peak
-the longest distance
average
-average of all the amplitudes

29

pulse duration

duration of one pulse
-made up of phases

30

phase duration

duration of one phase
-specific to AC