PRELIMS - LESSON 1 Flashcards
Static electricity (or electricity at rest) is
produced when there is an imbalanced
of electrical charges.
Electrostatistics
“Electricity” comes from the Greek word _____
which means _____.
elektron
amber
is able to produce static electricity when rubbed with a cloth.
Amber
carried out famous experiments
involving flying kites during
thunderstorms.
Benjamin Franklin
Benjamin Franklin Classified charges as either
positive or negative.
_____ Caused by the imbalance of electrical charges
lightning
He discovered negatively charged
particles known as electrons
JJ Thomson
discovered positively charged
particles known as protons
Ernest Rutherford
Charges are measured in ____
coulombs ( C)
When charges are opposites they _____
Attract
When charges are like they_____
Repel
Containing the same amount of positive and negative charges
Neutral
occurs when an external charged
sphere is placed near the neutral sphere.
Charge separation
Materials that can transmit electricity____
Materials that can’t transmit electricity______
Conductors
Insulators
Atoms are made up of three
subatomic particles namely:
● electrons,
● protons, and
● neutrons.
A stable atom always has ____ protons and electrons
Equal
An object’s _____ is the sum of the number of
electrons and protons.
net charge
equal number of protons and electrons__
more electrons____
more protons____
neutral
negatively charged
positively charged
Electrons are
transferred
when objects
are rubbed
against one
another.
Charging by
Friction
The chemical property of an
atom to attract electrons itself
is called ______
electron affinity.
● Also known as
charging by
contact.
● A charged object is
touched to a
conductor.
Charging by
Conduction
electrons travel through ____
conduction
this is charging without physical contact
Charging by Induction
It states that the algebraic sum of all the electric charges in
any closed system is constant.
Law of Conservation of Charge
