What Is "Electricity"?(c)1996 William J. Beaty
What is electricity? This question is impossible to answer because the
word "Electricity" has several contradictory meanings. These
different meanings are incompatible, and the contradictions confuse
everyone. If you don't understand electricity, you're not alone. Even
teachers, engineers, and scientists have a hard time
grasping the concept.
Obviously "electricity" cannot be several different things at the same
time. Unfortunately we've defined the word Electricity in a
crazy way. Because the word "electricity" lacks one distinct meaning, we
can never pin down the nature of electricity. In the end we're forced to
declare that there's no such stuff as "electricity" at all! Here's a
quick example to illustrate the problem.
Do generators make electricity? To answer this question, consider the household light bulb. Inside a lamp cord the charges (the electrons) sit in one place and wiggle back and forth. That's AC or alternating current. At the same time, the waves of electromagnetic field move rapidly forward. This wave-energy does not wiggle, instead it races along the wires as it flows from the distant generators and into the light bulb. OK, now ask yourself this: when "electricity" is flowing, is it called an Electric Current? Yes? If so, then "electricity" is simply the charges already inside the wires, where a flow of electricity is a flow of charge. And therefore we must say that the "electricity" sits inside the wires and vibrates back and forth. Generators do not create any, and electricity does not flow forward through the wires. Next, ask yourself if electricity is a form of energy. If it's energy, then electricity is not the movable charges. Instead, electricity is made of invisible electromagnetic fields, and it doesn't wiggle back and forth within the AC cables. Instead it can only exist in the space outside the wires, and not within the metal. Generators do create electricity, and it races along the wires at high speed. Yet please not that Electricity cannot do both, it cannot be both the charges and the fields, the electrons and the energy. Si which one is really "the electricity?" Is it the wiggling electrons within the wires, or is it the high-speed EM field energy? The experts unfortunately cannot agree on a narrow definition. The reference books give conflicting answers, so there *is* no answer.If someone asks whether generators make electricity, it exposes a great flaw in the way we talk about "electricity". If we can repair this flaw, perhaps our explanations will finally make sense.
Below are the five most common meanings of the word Electricity.
Which one do you think is right? Think about this carefully, because if
these meanings is correct, all the others must be wrong! After all, no
"science term" must ever possess several conflicting definitions.
Unfortunately our dictionaries and encyclopedias contain all of these
contradictions. (Click the links to find out more about each.)
If we wish to agree on a single correct definition of "electricity," which
definition should we choose? The Scientific version, number one above?
But that would mean that all of our books are wrong, since books insist
that electricity is the energy, or that electricity is the motion
of charges: the current.
Except for the CRC Handbook and the NIST SI
the few textbooks which do use the scientific definition are all seventy
years old, or older.
Well, maybe we don't need to choose just one definition. Could we mix them? Could we let Electricity be an "elastic term?" Suppose we ignore all these contradictions and instead pretend that all of the above definitions are true. Below is the "clear" and "simple" description of electricity which results:
Electricity is quite simple: "electricity" is just the flowing motion of electricity! Electricity is a mysterious incomprehensible entity which is invisible and visible, both at the same time. Also, electricity is both a form of energy and a type of matter. Both. Electricity is a kind of low-frequency radio wave which is made of protons. It's a mysterious force which cannot be seen, and yet it looks like blue-white fire that arcs across the clouds. It moves forward at the speed of light... yet it sits and vibrates inside your AC cord without flowing forwards at all. It's totally weightless, yet it has a small weight. When electricity flows through a light bulb's filament, it gets changed entirely into light. Yet not one bit of electricity is ever used up by the light bulb, and all the electricity flows out of the filament and back down the other wire. College textbooks are full of electricity, yet they have no electric charge! Electricity is like sound waves, no no, it's just like wind, no, the electricity is like the air molecules. Electricity is like cars on a highway, no, the electricity is the speed of the cars, no, electricity is just like "traffic waves." Electricity is a class of phenomena ...a class of phenomena which can be stored in batteries! If you want to measure a quantity of electricity, what units should you use? Why Volts of electricity, of course. And also Coulombs of electricity. And Amperes of electricity. Watts of electricity and Joules, all at the same time. Yet "electricity" is definitely a class of phenomena; merely a type of event. Since we can't have an amount of an event, we can't really measure the quantity of electricity at all... right? Right?Does my description above sound stupid and impossible? You're right. It is. The word "electricity" has contradictory meanings, and I'm trying to show what happens when we accept more than one meaning. Electricity is not both slow and fast at the same time. It is not both visible and invisible. And electricity isn't the flowing motion ...of electricity.
Instead, approximately ten separate things have the name
"electricity." There's no single stuff called "electricity."
electricity does not exist. Franklin, Edison, Thompson, and
science teachers should've had a long talk with Mrs. McCave before they
decided to give one single name to a large variety of independent
Mrs. McCave was invented by Dr. Seuss. She had twenty three sons.
She named them all "Dave."
Whenever we ask "What Is Electricity," that's just like asking Mrs. McCave
"who is dave?" How can she describe her son? There can be no answer
since the question itself is wrong. It's wrong to ask "who is Dave?"
because we're silently assuming that there's only one Dave, when actually
are many different people. They all just happen to be named Dave. Who
is Dave? Mrs. McCave cannot answer us until she first corrects our
misunderstanding. Dave doesn't exist. She wishes she'd given them all
For the same reason, we'll never find a simple answer to the question
"what is electricity?" because the question itself is wrong. First we
must realize that "electricity" does not exist. There is no single
thing named "electricity." We must accept the fact that, while several
things do exist inside wires, people wrongly call all of them by a
So never ask "what is electricity". Instead, discard the word
"electricity" and begin using the correct names for all the separate
phenomena. Here are a few of them:
The above questions all have sensible answers. But if you ask
what is electricity?, then all of the answers you'll find will just confuse you,
and you'll never stop asking that question.
"I am reminded of the professor, who when asked the question 'What is electricity?' replied 'It all depends what you mean by 'is.'" - A. Gilchrist, ASLIB 1972
MORE ABOUT "ELECTRICITY" 30 misconceptions that screwed *me* up.
(Note the many contradictory definitions found on other sites.
They all give answers, but they don't agree among themselves!)
This is part of Bill B's SCIENCE HOBBYIST website.