|Dear someone who knows about electricity , My name
is Adriana and I am a 4th grade student at
Stratham Memorial School, in Stratham NH. My class
has been researching all forms of energy trying
the answer the question, What is energy, and how
does it affect us?
I am focusing on electricity. I have learned a
lot in my research, like electricity is in our
bodies, it makes our heart beat, muscles move and
flows through our nerves. Electricity starts with
atoms, atoms have three smaller parts in them. One
of them is called electrons. Electrons can move
very fast from one to another. Moving electrons
create energy. Moving electrons can carry
electricity to different places. This is called a
electric current. Benjamin Franklin was not the
first person to discover electricity. Someone
named William Gilbert and Sir Thomas Browne were
the first scientists to use the term electricity.
So they should get the credit for discovering
electricity, not Benjamin Franklin. I have a few
questions I hope you can answer,
1.Why does electricity conduct through metal?
2.What is electromagnetism and how does it affect
us in our lives?
3.How are electronics still using energy even if
they are plugged in but turned off?.
I really appreciate you taking the time to help
me. You can reply in a email to my teacher, in a
letter to my school, (39 Gifford Farm Rd.
Stratham, NH 03885). Thank you! Sincerely, Adriana
|Question Date: 2019-02-27|
To answer your first question, metal is made
up of atoms that are packed in a really neat
structure, as if they are all holding hands.
Imagine that they are all holding little balls,
called electrons. Those electrons are free
to move and can be passed to the atoms next to
them. When an electric current is applied to
metal, it speeds up the passing of balls through
all the atoms holding hands, and that’s how
electric current flows.
To answer your second question,
electromagnetism is the interaction of electric
currents or fields and magnetic fields. It’s
one of the four forces of physics. It’s
created by stationary (staying still)
charges, or moving charges. Stationary
charges create electric fields and moving charges
create magnetic fields.
Electromagnetism is all around us every
day. It’s in our lighting, kitchen
appliances, communication systems like radio, and
security systems. It also has medical
applications. For example, when you go to the
doctor to get an MRI (Magnetic Resonance Imaging)
of your brain, you are in a giant electromagnet!
To answer your third question, it all has to do
with the electric and magnetic currents
talked about above. Wireless electronics don’t
require plugging into the wall, but they need to
be recharged every once in a while. When you plug
your electric toothbrush into the wall, for
example, current from the wall flows though a coil
inside the charger, which creates a magnetic
field. That magnetic field then induces, or
creates, a current in another coil that connects
to the battery. That recharges the battery, and
after a while gives your toothbrush power again!
1) This is really hard to answer simply. The
electrons in metals are partially "free",
meaning that they are not bound as tightly to
the metal atomics as the electrons in nonmetals
are. As a result, when subjected to an
electric field, the electrons move, i.e.
becoming electricity. You'll need to get
farther in school before it will be easy to
understand the structure of atoms!
(2) Electromagnetism is using an electric
current to create a magnetic field. All
electric motors work on electromagnetism. Because
so many of the machines that we use are electric,
this is extremely important!
(3) The electrical power comes from the power
lines, so any electrical circuit will draw power.
Turning the machine off may not completely sever
all possible circuits.
1. Metals have atoms that are all arranged in
a crystal structure, where the nucleus of the
atom stays in place, but the electrons are free
to move around. They can move from nucleus to
nucleus, and they carry electric current if
they're in a circuit with a battery that gives
them energy to move.
3. If the electronics or appliances are
totally turned off, they won't use energy. My
microwave has little green lights when I plug it
in, even when I'm not using it, and my meter says
it's using 0.18 amperes*. My rice cooker
has little black numbers when I plug it in, but my
'Kill A Watt' meter says it's using 0 amps and 0
watts. The little black numbers on the rice cooker
need less energy than the little green lights on
*Ampere is the unit to measure electric
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