Alexandria gazette. [volume] (Alexandria, D.C.) 1834-1974, 1909-03-05
ALEXANDRIA, GAZETTE AND VIRGINIA. ADvERTIzER
alexandria Gazette.
FRIpAY EYENINe. MAR. :. lsOs.
ELECTRICITY.
Why II 10 Difficult For the Laymsn te
Understand What It Is.

Understand What It Is.
"What is electricity is favor
ite query with people who desire to
"eet a rise" out Of scientific man
And when he fails to answer it IL
the same simple fashion that he
might treat the question "What Is
a biscuit?" the questioner cries out;
"Aha! You profess to know all
about electricity. Why, you can't
even tell what it isl"
Now, to "tell what a thing is
that is, to define it's to state its
relations with something more ia
miliar. The particular familiar
thing that the questioner Is think
ing of in this case il ordinary mat
ter. Heat has been explained to
him as a vibration of material par
ticles. Light, he has been told, ii
a wave motion in the ether, and he
understands the ether to be kind
of matter or a substance resem
bling matter in some particulars.
IT is not to be denied that no
such simple general relationship
can be stated between electricity
and matter. But, this being so, ii
would be Just as correct to say that
we do not know what matter is as
that we do not know what electrici-
tv is. As matter of fact, we do
not know what matter is, and the
latest plausible theory of it builds
it up on an electric basis, so that on
this theory the idea of electricity Is
more fundamental than that Of
matter. Unfortunately our senses
have been evolved by contact with
matter and are trained to detect
ONLY matter. Electricity they know
only secondarily, through its action
upon matter-the light or heat that
it causes matter TO give out, the at.
traction that it causes certain sub.
stances to exert, and so on. To the
man in the street, therefore, matter
is familiar, and he demands a state
ment of the latter in terms Of the
former, illogical though this may
be. After the scientist has stated
all this the reply comes back, Eyes,
! understand all that, and it is
most clear, l am sure, but tell me,
then, what is electricity anyway"
Another source Of confusion to
the lay mind is that scientific men
do not always use the word "elec'
trieity" to mean the same thing.
The engineer often employs it tc
express the thing that the theoret-
ical electrician calls electric ener-
gy."
To find the energy of electricity
that is, its ability to do work
the electrician multiplies the guam
THY of electricity by the potential
or tension under which it exists
But to the engineer this product
itself measures the thing that he
calls electricity"
The work that a pound of water
may do by falling a foot is one foot
pound. The water is the same after
falling as before, though its energy
is less. So to the electrician
quantity of electricity at 100 volts
is precisely the same as at one volt
though the former is able to do
times as much work.
This difference in meaning causes
thousands of disputes among stu
dents. electricity is a form Of
energy" says one, Gust like light
or heat" "0h, mo-" is the reply.
at is not energy at all, though it
may possess or convey energy" One
is talking about the cleo
tricity of the physical and the other
about that of the engineer; hence
their dispute is merely a matter OF
definition, though they do not know !
it. What wonder that some people |
are still content to regard the whole |
subject as a civilized Mumbo jun.
bo?-St. Louis Republic.