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Glossary of science and inventions 1

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Strip electrons from an atom and the atom becomes
positive ion
To say that electric charge is conserved means that no case has ever been found where the
net charge has been created or destroyed
A conductor differs from an insulator in that a conductor
has none of these:
has more electrons than protons.
has more protons than electrons.
has faster moving molecules.
has more energy than an insulator.
Charge carriers in a metal are electrons rather than protons because electrons are
loosely bound
Electrons are made to flow in a wire when there is
a potential difference across its ends.
A wire that carries an electric current
may be electrically charged.
which is correct?
a.Resistance flows though an open circuit.
b. Charge flows in a closed circuit.
c.Current is the primary cause of voltage.
d. Voltage flows through an open or a closed circuit.
b. Charge flows in a closed circuit.
A wire carrying a current is normally charged
not at all
The primary source of electrons in an ordinary electrical circuit is
the electrical circuit itself.
Alternating current is normally produced by a
generator
In a simple circuit containing a bulb, energy is given to the moving charges by
a generator
A positive ion has more
protons than electrons.
Moving electric charges will interact with
an electric field or a magnetic field.
Like kinds of magnetic poles repel while unlike kinds of magnetic poles
attract
An iron nail is more strongly attracted to the
north or south pole - no difference really.
Magnetic field lines about a current-carrying wire
circle the wire in closed loops.
if we think of the Earth as a magnet, its north (-seeking) pole is nearest
Australia
Which pole of a compass needle points to a south pole of a magnet?
north pole
Outside a magnet, magnetic field lines are conventionally drawn from
north to south
When a bar magnet is broken in two, each half is
as magnetic as the original magnet.
Thrust a magnet into a coil of wire and the coil
has a current in it
in an electrically neutral atom the number of protons in the nucleus is equal to the number of
electrons that surround the nucleus.
to say that electric charge is quantized is to say that the charge on an object
is a whole-number multiple of the charge of one electron
To say that electric charge is conserved is to say that electric charge
can be neither created nor destroyed.
Rub electrons from your hair with a comb and the comb becomes
negatively charged.
An electron and a proton
attract each other.
If you comb your hair and the comb becomes positively charged, then your hair become
negatively charged.
A balloon will stick to a wooden wall if the balloon is charged
either positively or negatively.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
rod of iron
A device that transforms electrical energy to mechanical energy is a
motor
When a bar magnet is thrust into a coil of copper wire, the coil tends to
repel the magnet as it enters.
A device that transforms mechanical energy into electrical energy is a
generator
Electromagnetic induction occurs in a coil when there is a change in
magnetic field intensity in the coil.

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