SWLCAT 1-3

When the prefix milli is used in the metric or SI system, a fundamental unit of measurement is multiplied by what factor?

.001

To convert from one unit of measurement to another, a conversion factor that is equal to ____ must first be established.

1

How many valence electrons do conductors generally have?

1 or 2

The proton has a mass that is over ____ times greater than the mass of the electron

1836

The first shell of an atom may contain only ___ electrons, while the the third shell may hold as many as 18

2

How many electrons are present in a copper atom?

29

The atomic number for copper is?

29

The maximum number of electrons that can be contained in any orbit is?

32

Semiconductors have ___ electrons in the valance shell

4

Knots reduce the rope's strength by approximately ? .

45%-55%

One coulomb is equal to

6 x 10^18 electrons

How many valence electrons do insulators generally have?

7 or 8

One horsepower equals ?

746 watts

The valence shell of any atom can hold no more than ___ electrons

8

For current to flow, there must be ?

A complete path

Conversions in the metric system involve multiplying or dividing by powers of ? . a. 1 b. 10 c. 100 d. 1000

B. 10

The ___ is a quickly formed light duty eye that is mostly readily applicable when hoisting a load

Cats paw

Materials with partially filled valence rings are said to be___

Chemically unstable

One amp of current flows through a wire when one___ flows past a point in one second

Coulomb

A volt is the amount of potential needed to cause one ___ to produce one ___ of work

Coulomb, joule

The system of measurement used the most often in the United States is referred to as the ____ system

Customary

Whole numbers, along with the operations of addition, subtraction, multiplication, and division, form a mathematical system called the ___

Decimal system

The value of any ___ in our numbering system is determined by the position it occupies with a particular number

Digit

In Ohms law calculations, voltage is indicated by the letter —?

E

An electrical current passing through a certain matter can cause chemical actions to take place, this action is called

Electrolysis

Voltage is defined as?

Electromotive force, or EMF

The flow of electrons is always from the pole of an electrical energy source that has an ___of electrons to the pole that has a ____of electrons

Excess, deficiency

Three methods of producing light with little heat loss are

Fluorescent, phosphorescent, electroluminescent

____ is generated any time current flows through a wire. This happens because energy is used to move electrons

Heat

Five effects electrical energy can produce are ?

Heat, light, magnetic fields, chemical action, pressure

The letter __ is used in ohms law calculations to represent current

I

When a conductor is heated, its resistance ___

Increases

Any time current flows through a conductor, not only is heat generated, but there is a ____ associated with it as well

Magnetic field

There must be relative motion between a ___ and a ___ in order to generate electrical energy.

Magnetic field, conductor

The process of producing electricity by moving a conductor through a magnetic field is called ____ and is the basis for electrical devices such as motors, generators, and transformers

Magneto-electricity

What two factors affect the speed of current flow?

Material and voltage

___ is the material from which all known physical objects are made

Matter

When two unlike metals are submerged in an electrolyte solution, the metal that accumulates electrons is the ____pole, and the metal that gives up electrons is the _____ pole.

Negative, positive

The gas that will give off light when current passes through it is ? .

Neon

What type of rope is best resistant to dynamic loading?

Nylon

Electrical current is produced when an electron from one atom knocks electrons from another atom out of __?

Orbit

Electrons revolve around the nucleus in paths called?

Orbital rings or shells

If too much current flows through a conductor, ___ can occur

Overheating

A ___ is a measurement that compares a number to 100

Percent

A flourescent lamp combines electroluminescence and ___ to produce light

Phosphorescence

The direction of current flow is defined as the ___ of the circuit

Polarity

Photoemission occurs when photons striking the surface of a material cause electrons to be released in a vacuum tube. A ___ placed in the tube will cause electrons to flow

Positive plate

Electrical current flow is caused by a ____ between two poles

Potential difference

When a voltage is applied to a circuit and current flows through the load, __ is consumed

Power

When placed under ____ certain crystalline substances will generate minute potential difference

Pressure

A short circuit has very little or zero ___?

Resistance

The ___ system has been declared as the preferred system of measurement by the US Congress

SI Metric

A ___ is not considered to be a hitch

Sheepshank

Which material is the best semiconductor?

Silicon

The best natural conductor of electricity is ? .

Silver

Semiconductors are used in the construction of ___

Solid state devices

The total amount of heat produced in a conductor is directly proportional to the ____flowing through it

Square of current

When referenced to metric measurements, the letters SI stand for what?

System of International Units

A device that uses the heating of two dissimilar metals to produce an electrical potential is called a(n)

Thermocouple

The process of joining two dissimilar metals together at a junction and applying heat to produce a transfer of electrons is known as the ___ process

Thermoelectric

Each atom will have the same number of protons and electrons. True or false

True

True or false: it requires more energy to remove electrons from atoms with their outer orbit over half filled to capacity?

True

True or false: the absolute value of any number will always be a positive number or zero

True

True or False: Light is one of the methods that can be employed to force electrons out of their orbits

True. There are six methods that are known to force electrons from the valence ring of an atom to become a potential electrical current participant: Friction, Chemical, Heat, Pressure, Light, Magnetism

Electrons in the inner orbits are even more difficult to move than those in the___, and are of little interests in the study of electricity

Valance ring (shell)

Only electrons in the ___ shell are available to participate in electrical current flow

Valence

The outer shell (orbit) of an atom is know as?

Valence shell

Power is directly related to the amount of ? and the amount of ?

Voltage and current flow

The ___ is the unit of electrical power

Watt

Batteries are usually divided into two categories, primary cells and ? cells. a. back-up b. grounded c. reserve d. secondary

d. secondary

The type of circuit that would have the highest or maximum current flow is a(n) ? circuit. a. closed b. open c. series d. short

d. short A short circuit has almost no resistance and a high current flow. The current has found a shorter path back to the source than going through the resistance of the full circuit.

As semiconductors are heated, their resistance ___

decreases

A solution that causes electrical conduction in liquids is called a(n) ?

electrolyte

Which particle has a negative charge and rotates around the outside of the nucleus of the atom?

electron

An atom is composed of a central nucleus which is surrounded by which orbiting particles?

electrons

Electrical current is the flow of?

electrons

Increasing the temperature applied to the junction of a thermocouple will cause a greater transfer of?

electrons

The simplest form of any matter is called a(n)

element

Pressure can be produced by an electrical current that causes the physical displacement of ____ in a crystal

ions

Photovoltaic action uses ? energy to produce electricity.

light

Our primary source of electric power is?

magnetism

How many valence electrons does copper have?

one

Electrons revolve around the nucleus in paths called?

orbits

Light occurs on a television screen when an electron beam strikes a surface covered with ? .

phosphors

The condition in which photons bombard a relatively poor conductor causing that conductor to free more of its electrons and become a better conductor is known as?

photoconduction

Light contains small particles of energy called ? .

photons

Electricity derived from pressure is known as the ____ effect

piezoelectric

The charge of the nucleus of any atom is always?

positive

the two particles that make up the nucleus of an atom

protons and neutrons

Smaller sub-particles of the proton and neutron are called ? .

quarks

Like charges _____ and opposite charges ______

repel, attract

Which material is the best insulator?

rubber

The maximum possible speed at which current can travel is?

speed of light

True or false: magnesium is considered a metal bc it has two valence electrons

true

Depending on how a crystal is cut, either a bending pressure or a ? action can be applied to create a potential difference.

twisting

The atomic particles in the outermost orbit of the atom are called?

valence electrons

The quantity of protons in an element can be identified by the element's?

Atomic numbee

A(n) ___ is the smallest particle to which an element can be reduced yet still retain the characteristics of that element

atom

The chemical source of electricity is best represented in our everyday lives as the ?

battery

As electrons rotate about the nucleus ____ tries to cause them to fly off into space

centrifugal force