102E.4 PRINCIPLES OF ELECTRICITY

Light, heat, chemical and magnetic changes are all produced by:

electricity

Materials that best transport electricity are called:

conductors

An amp is a unit of electric:

strength

When a facial steamer is on and steam begins to flow, you have an example of a(n):

closed circuit

A current in which electrons move at an even rate and flow in only one direction is called:

direct current

The negative poles and positive poles at the end of a circuit are known as:

polarity

All of the following terms are types of waveforms EXCEPT:

round

When too many appliances are put on one circuit and are operated at the same time, more current flows than the line is designed to carry. This is known as:

overload

Dropping an electrical appliance into water, making it a foreign conductor, causes a(n):

short circuit

Which of the following items is a reusable safety device that breaks the flow of current when an overload occurs?

circuit breaker

The measure of how difficult it is to push electrons through a conductor.

Resistance

Material that does not allow the flow of electric current.

Insulator

A broken path of electron flow.

open circuit

Power source most often used in a salon, spa or barbershop; produces alternating current; uses mechanical energy to produce a flow of electrons.

Generator

A rating providing the number of cycles per second that a generator alternates the current from the source; also known as frequency.

Hertz

A form of energy that produces light, heat, magnetic and chemical changes.

Electricity

The technical name for any electrically powered appliance.

load

A unit of electric resistance.

ohm

An instrument that measures the electrical current used in skin care equipment.

Milliampere Meter

Closed path through which electrons travel.

circuit