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Flashcards in Electrotherapeutic Basics Deck (154)
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1

What 3 things must be present to have a current

1. A source of electrons
2. A conductor of the electrons
3. A driving force of electrons

2

What are atoms that possess charge known as

Ions

3

Where do ions move from and to

From areas of high concentrations to areas of low concentrations

4

What is the net movement of charged particles along a conductor

Current

5

What is the amount of potential (electrical) difference between two points ([ions] or electrons) in an electrical field

Electromotive force (EMF)

6

What does the electromotive force do

Drives the charged particles that are measured in volts

7

What size electromotive does the commercial current flowing from a wall outlet produce (2)

1. 110-115 V
2. 220-240 V

8

True or False:
Electrotherapeutic modalities modify voltage for specific therapeutic purposes

True

9

True or False:
In the human system the electric stimulator generates a voltage to overcome resistance allowing a current to flow along the path of least resistance

True

10

What makes an electrotherapeutic modality a low voltage generator

Produces a voltage less than 150 V

11

What makes an electrotherapeutic modality a high voltage generator

Produces a voltage greater than 150 V

12

What is a coulomb (C)

The measure of electric charge equal to 6.25*10^18 electrons

13

What is an ampere (A)

The measure of current flow equal to 1 C per second

14

What is an Ohm (omega)

Measure of resistance to current flow

15

What is voltage (V)

Measure of the potential difference or EMF required to move 1 A of current across 1 Ohm of resistance

16

What is resistance (Ohms)

The ability of a medium to resist the flow of electrons through direct current

17

What is inductance

Opposition to electron flow created by electromagnetic eddy currents generated when current is passed through a wire

18

What is capacitance

Ability of a material to store an electrical charge

19

What is impedance

Resistance + inductance + capacitance

20

What are conductors

Materials that offer little resistance and allow current to flow easily

21

What are insulators

Materials that offer high resistance to current flow

22

What are semiconductors

Materials that offer neither high nor low resistance to current flow

23

What is the pump of water flow equal to in electron flow

Volts

24

What is the gallons of water/min equal to in electron flow

Ampere

25

What is the length and diameter of the pipe equal to in electron flow

Resistance

26

Energy created by water flowing is dependent on what (2)

1. Pressure in the pipe
2. # of gallons flowing per unit of time

27

What is electrical power measured in

Watts

28

What do watts equal

Volts*amps

29

What does power equal

EMF*current (V*I)

30

What is 1 watt equal to

The power needed to move one ampere of current with a force of one volt