This is part 2 of WHAT IS ELECTRICITY. Loading...
CONTRADICTORY DEFINITION 1.
SCIENTIFIC DEFINITION: "The Electricity" is the electric charges.
Dictionaries often define electricity as "a fundamental entity of nature
consisting of negative and positive kinds." This is a scientist's definition of
the word, where "quantity of electricity" means the same as "quantity of
charge." In other words, electric charge is a charge of electricity.
Franklin, Faraday, Maxwell, Millikan, Thompson, Einstein, and many other
historical scientists used the word "electricity" in this way. They
stated that an electric current was a flow of electricity. And
whenever we talk about electricity flowing inside of wires, or talk about
electrons being the particles of electricity, we're using the above
definition.
PROBLEMS
Unfortunately, like all the other definitions below, this one contradicts
the other definitions on this page. If this one is right, then all of the
others are wrong. If we decide to follow the lead of scientists and
declare that "quantity of electricity" means "amount of charge", we create
some serious problems...
If "Electricity" is charge, then Electricity is not a form of energy.
Charge and energy are two completely different things. For example, the
charges in an AC cord wiggle back and forth without flowing forwards, yet
the electrical energy does flow forwards rapidly. Analogy: if
electricity
was like water, then electrical energy would be like sound waves.
If we
say that "electricity" is both energy and charges, that's as bad as saying
that water molecules are made out of sound. (No WONDER the
textbook explanations are so confusing!)
So, according to the scientist's definition of "electricity," any book is
wrong if it says that electricity is a form of energy. Charge is not
energy! Since electric charge is permanently attached to certain
particles of matter, we're forced to say that
that electricity is a basic component of everyday matter. Think of
electricity like this: objects are made of molecules, which are made of
atoms, which are made of tiny particles called protons and electrons...
and the electrons/protons are made of positive electricity and
negative electricity.
Under the scientists' definition, how fast does "electricity" flow? This
is the most controversial aspect of this particular definition. The drift
velocity of electrons in metal wires is slow; not much more than a few
centimeters per minute. So scientists must say
that electricity in wires
flows very slowly. The speed of electricity
depends on the size of the wire and the value of the electric current. A
HIGH current is simply a FAST flow of "electricity." On the other hand,
the "electricity" in AC cords doesn't really flow at all. Instead it
sits in one place and wiggles back and forth over a very short distance.
Scientists would say that all wires are always full of "electricity:"
it is the movable electrons found in all metals. When
a circuit is broken, the "electricity" stops where it is, and it remains
in the wires. But that's where it started out in the first place. All
metals are partly composed of movable negative electricity.
According to Definition #1, the "quantity of Electricity" is measured in
units called coulombs, or in units
of ampere-seconds, which means the same as coulombs. Electricity is NOT
measured in kilowatt hours (since, according to definition #1,
electricity is charge, not energy.)
Under definition #1 there are only two types of electricity: positive
electricity and negative. When electricity flows, we call the flow by
the name "electric current." The basic quantum of "electricity" is the
charge of the proton or the charge of the electron.
According to the scientists definition, there is no such thing as
"current"
electricity. ("current" electricity is silly, like saying "current"
water or "current" air.) We can still speak correctly about an
electric
current, of
course. Whenever negative electricity flows through positive electricity,
that's an electric current inside a metal. By definition #1, electric
current isn't a "kind" of electricity, any more than flowing water is a
different "kind" of water. Instead electric current is a flow of
electricity. (This goes completely against the Grade School definition
#3 below, which
says that the electricity is the flowing motion of charge rather
than the charge itself.
According to the scientists' definition of "electricity," there is no such
thing as "static electricity." (Is "Static Water" a special kind of
water?!) What we call "static" is really just
electricity itself, pure and simple. In everyday life we rarely encounter
"electricity" itself, because normally the effects of the positive and
negative electricity within matter will exactly cancel out. "Static"
really isn't
unmoving electricity. Instead it is UNCANCELLED electricity or SEPARATED
electricity. Pull some negatives away from some positives and this allows
us to
us observe the behavior of pure "electricity." However, even though
"static electricity" doesn't exist, there still can be a field of science
called Electrostatics. Just as Hydrostatics is the study of water forces
and pressure, Electrostatics is the study of electrical forces and
the "pressure" called Voltage. And just as there's no such energy
called "static water," there's no such energy called "static
electricity."
Under the scientists' definition of "electricity", the electric company
does not sell
any electricity, instead it sells a pumping service. The electricity just
vibrates slightly back and forth inside the wires. Generators don't
"generate" this electricity, instead they only pump it. Metal wires act
like pipes which are already full of water; where the water is the
"electricity." Electrons are supplied by the wires, not by the electric
generators, so we should not say that generators "generate" any
electricity. Instead, generators act as electricity pumps, and all of the
"electricity" in the national power grid is supplied by the metal of the
wires. An AC generator forces the electricity of the wires to wiggle back
and forth. A DC generator (or a battery) forces the electricity to flow
continously in a circle, sort of like a drive belt.
Even though
electricity flows quite slowly, wires can deliver energy almost instantly.
(After all, if a drive belt all moves at once, then the drive-pulley can
instantly move the driven pullies.) No charges are gained or lost during
this process; so if "electricity" is defined as charge, then "electricity"
is NOT consumed or used up in an electric appliance. Neither is it
created. Instead, the "electricity" behaves like a mechanical
drive-belt: it fills the whole circuit, and it moves along slowly, yet it
can deliver energy instantly to all parts of the circuit or "belt."
What is "electricity?" Under the scientists' definition there is
a simple answer to this question: Matter is mainly
composed of particles of
electricity (of electrons and
protons,) so if we should say that electricity is a type of matter, we
wouldn't be too wrong. Electricity is not matter in the everyday sense,
instead electricity is one step down from matter. It's one of the main
components of matter. Electricity has mass, although for electrons the
mass per cubic volume is very small
(the electrons of a wire are thousands of times lighter than the copper
atoms, yet the number of electrons rivals the number of atoms.
Under this definition, electricity is NOT invisible. Instead,
electricity is very visible: objects are visible because light is
reflected by the atoms' electrons within the objects. When we
look at a bunch of atoms, we see only the atoms' outer shell, we see
only the electrons... we see only the "electricity". Electricity causes
colors by vibrating resonantly in response to light waves. Conductors
look silvery
because their internal electricity "shorts out" the light waves, causing
mirror-like reflection.
Rather than being invisible,
"electricity" is about the only thing that IS visible.
Note again that this
definition
conflicts with the other eight definitions.
Common uses of the word:
CHARGES OF ELECTRICITY. COULOMBS OF ELECTRICITY. FLOW OF ELECTRICITY.
CURRENT OF ELECTRICITY. POSITIVE ELECTRICITY. NEGATIVE ELECTRICITY.
Contradictory Definition 2.
THE POPULAR DEFINTION:
Electrical energy is "The Electricity."
This definition
is used
by electric companies, and used by people who discuss home energy use and
home appliances. It contradicts all the other definitions on this page.
It is unscientific (according to the scientists' definition above,
electricity is NOT energy.)
Here are the consequences of defining "electricity" to mean "energy."
In an electric circuit, the electrical energy is not carried by individual
electrons. Instead electricity is composed of electrostatic fields and
magnetic fields which exist in the region surrounding the
wires. The
energy within these fields is called Electromagnetic energy or
"EM." Therefore, under this definition of the word, the
"electricity" is NOT made of electrons, instead it is made of invisible
Electromagnetic Fields. In other words, energy-electricity is
the same stuff as radio waves and light. (Do we really want to say that
electricity is a kind of low-frequency radio wave? That's what we're
doing here! There is no escape from this problem, since electrical
energy *is* a kind of low-frequency radio wave.)
In AC
power lines, we're forced to say that
electricity is made of 60Hz electromagnetic fields. In DC circuits the
electricity is still made of
EM fields, but their frequency is close to zero.
By this definition, the smallest quantity of "electricity" is the basic
particle of electromagnetism: the Photon. (Yes, electricity is Photons,
and NOT Electrons. Electrical energy is made of photons. Therefore
electricity is made of photons. But only if we use Definition Two.)
If electricity is a form of energy, then we're forced to say that
"electricity" appears on the same frequency-spectrum as radio waves and
light, but is very much lower in frequency. Go find a diagram of the
Electromagnetic Spectrum, look at 60Hz, and there you will find the
quantities of "electricity" sold by utility companies.
If electricity means electric energy, then electricity does not flow
INSIDE the wires. In electrical circuits, the electric energy travels as
invisible fields found in the space outside the wires and not within.
If "electricity" is energy, then whenever you wave your hand near a power
cable, you are putting your hands into the "electricity." If you stand
near a major cross-country power line, your body is in the enormous flow
of
"electricity" being sent to distant cities. You can even wave a
fluorescent light under the power line, and it will light up even though
it's not connected to wires. It lights up because it is touching the
electric energy that flows outside the cables overhead.
The electric and magnetic fields of electric energy cannot be seen. If
"electricity" is energy, then electricity really is invisible. (Yet
high-frequency electricity is the EXACT SAME THING as light! Perhaps
"electricity" is the only visible thing anywhere...)
This "electricity" is sold by electric companies and moves at nearly the
speed of
light on its way to the customers. It travels as invisible pulses in the
region outside of the wires, while at the same time the electric charges
vibrate inside the
wires. Household appliances consume electricity and convert it to other
forms of energy. This "electricity" can be created and consumed,
much the same way that light waves and radio waves are emitted and
absorbed.
According to our definition 2, if electrons are like air molecules, then
"electricity" is like sound waves which move through the air. The
electrons sit in once place and wiggle as the "electricity" flows through
them.
At higher frequencies, "electricity" pours out of all radio transmitter
antennas. (If electricity is a form of energy, radio waves and electricity
are the same kind of thing. Only their frequency is different.) Yet the
frequency really isn't so important: if we had a radio antenna 200 miles
long, we could plug it into a wall outlet, and the 60Hz "electricity"
produced by Electric Companies would be broadcast into space. Such a thing
happens naturally with long transmission lines, and a certain tiny amount
of "electricity" leaks away into space.
Note that "Electricity is energy"
conflicts with the other eight definitions on this page.
Common uses of the word:
PRICE OF ELECTRICITY. KILOWATT-HOURS OF ELECTRICITY. ELECTRICITY
TRANSMISSION. PRODUCER OF ELECTRICITY. USE UP SOME ELECTRICITY.
Contradictory Definition 3.
GRADE SCHOOL DEFINITION:
When charges flow, their motion is "The Electricity."
"Electricity"
means "electric current." This definition is used in textbooks at the
K-6 grade level. Note that it contradicts all of the other definitions on
this page. It is also unscientific (see definition #1 above.)
Consequences of definition 3:
If "electricity" is the current, then "electricity" appears whenever the
electrons of a metal wire are forced to flow (that is, electrons moving
relative to the protons of the copper atoms in that wire.) And when the
flow is halted, the "electricity" vanishes, even though the electrons are
still there inside the wires.
Be careful not to say that electric current is a FLOW OF electricity, for
this would be mixing definition No. 1 into this definition. And what the
heck is a flow of Current??? If a current is a flow, then how can
"flow" be flowing? What flows in rivers, current? Or water?
If
"electricity" means current, then electricity never
flows. ELECTRONS flow, but according to this Grade-school definition,
electrons are not the electricity, ELECTRON MOTION is the electricity (and
so it would be very twisted to say that a flow of electricity IS the
electricity which flows, because
the motion of a stuff... is not the stuff that performs the motion.
Makes your brain hurt!) By this present definition, electricity cannot
flow, it can
only appear and vanish. If the current IS the electricity, then whenever
the electrons stop moving, the "electricity" blinks out of existence.
When the electrons start moving, "electricity" mysteriously appears all
throughout the wires. This electricity is not a stuff, and it is not a
form of energy. Instead it is a motion. This electricity cannot flow,
but it can have a direction. (Why? Well, remember that water can
flow through pipes, but water-current cannot flow, yet water-current has a
direction. The same applies to flows of charge.) Does this make
your head hurt?
The crazy science in Grade-school textbooks certainly makes MY head hurt.
Under this definition, electricity is not a form of energy. Amperes are
not Watts. Electricity (Electric
current) does not transport any energy, and if you measure the current,
you
will know nothing about the electrical energy. If you measure the current
in a wire,
you cannot even tell which way the electrical energy is flowing. After
all, electrical energy can flow against the electric current or with it
(and electric current is a very slow flow of charges, while electrical
energy is a fast flow of EM fields.) Things get worse in AC wires, since
the electrical energy moves continuously forward, while the
electricity direction changes back and forth. Under the Grade-school
definition, electricity is certainly not a form of energy.
Under this definition there are only two kinds of electricity: AC
electricity and DC electricity; the two kinds of electric current.
Is electricity invisible? Although crowds of electrons are plainly
visible within wires (they look
silvery,) their flowing motions cannot be seen. Electrons' flow is
invisible, so if electricity is the current, then "electricity" is
invisible. Electric current produces magnetic fields, therefore this
"electricity" is closely associated with the magnetic force.
Grade school textbooks insist that "electricity" is the motion of
electrons rather than the electrons themselves. This is very bad for
standardized meanings of words, since
the textbook authors have stopped using the scientific definition of
"electricity." Instead they've gone and made up their own. This hurts
students
because the kids now have to imagine a special kind of flow... that itself
can flow along!
(What is a flow of a flow?)
Kids aren't supposed to imagine electrons flowing, they're supposed to
imagine ELECTRON FLOW that's flowing.
This is almost impossible. Electrons can flow, but "flow" cannot flow.
This definition is responsible for a whole collection of student
misconceptions.
Note that this definition conflicts
with the other eight definitions on this page.
Common uses of the word:
CURRENT ELECTRICITY. AMPERES OF ELECTRICITY. FLOW OF "CURRENT"
Contradictory Definition 4.
"Electricity" is the amount of imbalance between nearly-equal
quantities of electrons and protons of a substance.
This is an old definition of
"Electricity"; Ben Franklin would recognize it.
Consequences of definition 4:
Neutral matter contains equal numbers of positive and negative charged
particles. If the numbers are balanced, then we say that no "electricity"
exists. When these opposite charges are sorted out and separated from
each other, we say that "electricity" appears. If the same electrons and
protons are allowed to approach each other and combine again, we say that
the
"electricity" has cancelled out and vanished. According to this
definition, the electrons and protons aren't the electricity. Instead,
their SEPARATION or IMBALANCE is.
Whenever we have more electrons than protons in a single spot, or more
protons than electrons, then we have "electricity." Fur and rubber have
no electricity, but when rubbed together, "electricity" is generated. This
type of electricity NEED NOT BE STATIC. It can flow: if one electrified
object is touched to a long wire, the imbalance of charge immediately
flows to all parts of the wire. Note that this is not an electric
current, instead it is an "electrostatic wave" where one region of excess
charge causes a neighboring region to become unbalanced as well.
These imbalances of charge cannot be directly seen. A charged balloon
looks the same as an uncharged balloon. The imbalance is tiny when
compared to the charge already there within the object, and it's effect
upon light is tiny. By this definition, we must say that "electricity" is
invisible. Charge-imbalance creates electric fields, so we must say that
"electricity" is closely associated with the electric force. Note that
this definition conflicts with the other eight definitions.
Common uses of the word:
STATIC ELECTRICITY, FRICTIONAL ELECTRICITY.
Contradictory Definition 5.
A class of phenomenon involving electric charges is "The
Electricity." This
definition is commonly used by the general public. By this definition,
anything that's electrical becomes a KIND of electricity.
Consequences of definition 5:
By this definition there are many kinds of electricity: bioelectricity,
piezoelectricity, triboelectricity, frictional electricity, contact
electricity, thermoelectricity, myoelectricity, atmospheric electricity,
geoelectricity, etc. By this definition, any electrical happening is a
KIND of electricity. Lightning is electricity, but so are batteries,
wires, and lightbulbs.
We use the word "weather" in a similar way: wind, sunlight, and
precipitation are "weather" in the same way that charge, currents, wires,
and sparks are "electricity." But a river of rainwater is not a flow of
"weather" and an electric current is not a flow of "electricity." You
cannot carry a bucket of "weather" and you cannot collect this type of
"electricity."
Note that this definition conflicts with the other eight definitions. On
the other hand, all the other definitions on this page describe a variety
of specific electrical phenomena. Therefore, Definition Five can suck up
all the other definitions into itself, forming a huge tangled glob of
contradictory concepts that nobody, not even the greatest genius, has the
slightest hope of understanding. :)
Here are some less common definitions.
A. "Electricity" is a field of science. By this definition, the word can
be used interchangeably with the term Electrical Science or with the
section of physics called Electromagnetism. This
"electricity" is similar in to "optics" or "geology." It would be
silly to think that Geology is a substance or energy, therefore this
type of Electricity is neither energy nor matter. Instead it is a
chapter heading, it's an area of study.
B. "Electricity" is a flowing motion of electric energy, it is electric power.
This definition is used by some electric companies, probably in a
misguided attempt to combine definition 2 with definition 3. By
this definition, whenever electrical energy is transferred from place
to
place, the rate of transfer is the amount of "electricity." Note well:
the electrical energy isn't the "electricity", instead they say that
"electricity" is the
flow rate. So when
electrical energy stops flowing, the power is zero and we must say that
the "electricity" has vanished, even though we still could have lots of
(non-
flowing) electrical energy present.
If "electricity" is power, then
electricity can never flow (a Flow does not flow, a flow just exists.)
If "electricity" is power, then a bright light bulb exhibits a higher
level of electricity than a dim one. WATTS OF ELECTRICITY.
C. "Electricity" is the electric field. By this definition, radio waves
and light waves are said to be composed half of magnetism, half of
"electricity." When a high value of electric field is developed on a
mountain peak, the air in the environment is said to be full of
"electricity." Electric fields are invisible, so we can say that
"electricity" is invisible. This kind of "electricity" is
approximately the same thing as Voltage. VOLTS OF ELECTRICITY.
D. "Electricity" is the electric force. By this
definition, electrical attraction and repulsion *are* the electricity.
ELECTRICITY IS AN INVISIBLE FORCE, ONE OF THE FOUR FORCES IS ELECTRICITY
E. "Electricity" is not "electronics." Electronics involves transistors,
ICs, tubes, CRTs, signals, computers, etc. "Electricity" is
much simpler; electricity is batteries, motors, switches, light
bulbs, and perhaps buzzers and relays. We would never say that
"electronics" flows in wires, so we should avoid saying the same about
electricity. LEARN ELECTRICITY BEFORE LEARNING ELECTRONICS.
F. "Electricity" is nitrogen/oxygen plasma created by an electric field.
By this definition, whenever a spark jumps, we can say that
"electricity" jumped too. By this definition, lightning, auroras, and
St. Elmo's fire are examples of "electricity." This kind of
"Electricity" is a bit like fire. It is colored blue-white. By this definition,
"electricity" is very visible. Turn on a big Tesla Coil, and
"electricity" shoots out. SPARKS OF ELECTRICITY.
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