ELECTRICITY Chapter 4

Light, heat, chemical & magnetic changes are all produced by

electricity

Material that best transports electricity is a

conductor

Since silver & copper transmit electricity, they are called

insulators

Materials that do not allow a current to pass through them are called

insulators

Materials such as glass, rubber or paper around a conductor that does not allow current to pass through it is called a

insulators

Which of the following materials does NOT allow a current to pass through it?

alcohol

An ampere is a unit of electric

stength

How many milliampere equal one ampere?

1,000

A volt is a unit of electric

pressure

a unit of electric resistance is called a

ohm

A measure of how much electric energy is being used is known as a

watt

A constant electric current flowing in one direction is called a

direct current

Which of the following devices breaks the flow of current when an overload occurs?

circuit breaker

Which of the following steps should NOT be followed to break the circuit when person comes in contact with an electric current?

touch the person to ground the circuit

The application of special currents (or modalities ) that have a variety of effects on the skin is called

electrotherapy

A current conductor used to direct the current from the appliance to the client`s skin is called a

electrode

The direct current used in electrotherapy treadments is

galvanic

The electrode that is negatively charged during an electrotherapy treadment is known as a

cathode

What temporary effect will a negative electrode pole produce when applying galvanic current during an electrotherapy treadment?

increase in blood flow

Which of the following is NOT a temporary effect of the positive pole of galvanic current?

softens tissues

A treatment in which sebum is broken down or blackheads are liquefied as in deep-pore cleansing, is known as

desincrustation

When using galvanic current on clients in a salon, what precaution must a salon professional take in order to prevent injury to the client?

do not use over an area having broken capillaries

Faradic current is used chiefly to cause

muscle contractions

Tesla, a high frequency current, is known as the

violet-ray

High frequency & alternating current are charactertics of which type of electrotherapy?

Tesla

An alternating current that can be adjusted to different voltages to produce heat is

high frequency

If the client is holding the active electrode while the salon profressional manually stimulates the area being treated, what method of tesla current is being used?

indirect application

Which of the following will produce a mild, stimulating sensation while using high frequency current?

slightly separating the electrode from the skin

Treatment with light rays is called

light therapy

Which type of light can be broken into its individual wavelengths

white light

Which of the following has the longest wavelengths?

infraed rays

A salon owner wants to mimic nattural sunlight as closely as possible in the salon reception area. Which type of light would most likely be used to accomplish this requirement?

incandescent

Pure heat rays are produced by

infared rays

Which of the following is a benefit of using infared light during a facial?

increases circulation

The minimum distancean an infared lamp must be placed from the client`s face during a facial is about

30

Which of the following are also known as actinic rays?

ultraviolet

Which of the following is a benefit derived from UV light?

small doses tan the skin

Small does of ultraviolet light may help the body produce

Vitamin D

Bacteria that cause skin infections can be killed by

ultraviolet light

Before using ultraviolet light on a client, the skin or scalp should be

cleansed