Ch. 8: Basics Of Electricity Flashcards Preview

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Flashcards in Ch. 8: Basics Of Electricity Deck (56)
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1

Define: Electricity

* The movement of particles around an atom that creates pure energy.

* A form of energy that, when in motion, exhibits magnetic, chemical, or thermal effects.

2

What is an Electric Current?

The flow of electricity along a conductor.

3

What is a Conductor?

Any substance, material, or medium that easily conducts/transmits electricity.

4

What is an Insulator?

A substance that does not conduct/transmit electricity.

5

The path of negative and positive electric currents moving from the generating source through the conductors and back to the generating original source is called ______.

A Complete Electric Circuit

6

What are two kinds of electric current?

* Direct Current (DC)
* Alternating Current (AC)

7

Describe Direct Current (DC)

A constant, even-flowing current that travels in one direction only.
(Ex: flashlights, cellular telephones, and cordless handheld devices)

8

Describe Alternating Current (AC)

A rapid and interrupted current, flowing first in one direction and then in the opposite direction.

9

The unit that measures the pressure or force that pushes the flow of electrons forward through a conductor.

Volt (V)

10

The unit that measures the amount of an electric current (quantity of electrons flowing through a conductor).

Ampere / Amp (A)

11

One-thousandth of an ampere.

Milliampere (mA)

12

The unit that measures the resistance of an electric current.

Ohm (O)

13

A measurement of how much electric energy is being used in 1 second.

Watt (W)

[Ex: 40-watt light bulb uses 40 watts of energy per second]

14

1000 watts

Kilowatt (K)

15

What is a Rectifier?

An apparatus that changes alternating current to direct current.

16

What is a Converter?

An apparatus that changes direct current to alternating current.

17

What is the purpose of a Fuse?

It prevents excessive current from passing through a circuit.

18

What is a circuit breaker?

A switch that automatically interrupts or shuts off an electric circuit at the first indication of an overload.

19

Define: Grounding

The ground connection completes the circuit and carries the current safely away to the ground.

20

What is Electrotherapy?

The use of electrical devices to treat the skin and for therapeutic benefits.

21

What are Modalities?

Currents used in electrical facial and scalp treatments.

22

What is an Electrode?

An applicator for directing the electric current from an electrotherapy device to a clients skin.

23

Define: Polarity

Indicates the negative or positive pole of an electric current.

24

Define: Anode

A positive electrode

25

Define: Cathode

A negative electrode

26

What is a Galvanic Current?

* A constant and direct current.

* Uses a positive and negative pole to produce the chemical reactions (desincrustation) and ionic reactions (iontophoresis).

27

What is the Active Electrode?

Electrode of an electro therapy device that is used on the area to be treated.

28

What is the Inactive Electrode?

The opposite pole from the active electrode.

29

Define: Iontophoresis

The process of introducing water-soluble products into the skin with the use of electric current.

30

Define: Cataphoresis

Process of forcing an acidic (positive) product into deeper tissues using galvanic current from the positive pole toward the negative pole.