4.1 Principles of Electricity
electricity
Light, heat, magnetic and chemical changes are all produced by:
conductors
Material that best transports electricity are called:
insulators
Materials that do not allow a current to pass through them are called:
direct current
A current in which electrons move at an even rate and flow in only one direction is called:
watt
A measure of how much electric energy is being used is known as a:
local shock
A shock that passes through a small part of the body, causing burns and muscle contractions is called a:
general shock
A shock that passes through the nervous system is a:
ohm
A unit of electrical resistance is called a(n):
pressure
A volt is a unit of electric
the appliance has been certified to operate safely under the conditions specified
An Underwriters Laboratory (UL) designation indicates:
strength
An ampere is a unit of electric:
load
Any electrical appliance activated by the flow of electric current such as a blow dryer is known as a(n):
breaks
Cords on appliances should be kept straight and free of knots, kinks, and tangles to prevent:
short circuit
Dropping an electrical appliance into water, making it a foreign conductor, causes a(an):
conductor
Electric currents move along a path called a(n):
circuit
Electrons travel on a closed path, called a:
too many appliances use the same wall socket and overload the circuit
Fires in electrical circuits can occur if:
insulating materials
Glass, rubber or paper are examples of what type of materials?
1000
How many milliamperes equal one ampere?
1000
How many watts equal one kilowatt?
turning off the fuse box or circuit breaker
If someone comes in contact with an electric current, you can break the circuit carrying the power by:
electrons
Most of the electricity you use daily consists of a flow of tiny, negatively charged particles called:
conductors
Since silver and copper transmit electricity, they are called:
electric current
The movement of electricity along a path called a conductor is a(n):
rating
The resistance to the motion of the electrons through a conductor is the Ohm's:
load
The technical name for any electrically powered appliance is a(n):
AC & DC
The two forms of electrical current are:
alternating current
The type of electrical current in which electrons flow first in one direction, then in the other is:
circuit breakers
To avoid the possibility of overloads and short circuits, safety devices are installed in appliances and buildings. Two of these devices are fuses and:
batteries
Two common sources of electric current are generators and:
mechanical
Using electric clippers in cosmetology work would be an example of which kind of electrical effect?
nameplate
Voltage needed, frequency required and watts the appliance consumes are indicated on the:
short circuit
What can occur anytime a "foreign conductor" comes in contact with a wire carrying current to an appliance?
insulators
What protects people from getting shocked by electric current?
closed circuit
When a blow dryer is on and air begins to flow, you have an example of:
overload
When too many appliances are put on one circuit and are operated all at the same time, more current flows than the line is designed to carry. This is known as:
turning on a light switch
Which of the following actions would be an example of closing a circuit?
rectifier
Which of the following changes alternating current to direct current?
measure of how hard the electrons are being forced or pushed by a source
Which of the following descriptions identifies voltage?
circuit breaker
Which of the following devices breaks the flow of current when an overload occurs?
alcohol
Which of the following materials does NOT allow a current to pass through it?
put water on it
Which of the following should NOT be done if a fire results from an overload of an electric circuit?
touch the person to ground the circuit
Which of the following steps should NOT be followed to break the circuit when a person comes in contact with an electric current?
