ELECTROSTATICS
is the branch of physics that deals with the study of electric
charges at rest. It encompasses:
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a basic property of matter that describes the amount of
electrical energy that an object possesses.
can be positive or negative.
objects with different charges will experience an
attractive or repulsive force.
THE COULOMB (C)
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The unit of electric charge is the Coulomb (C).
One Coulomb of charge is defined as the amount of
charge that passes through a conductor when a current of
one Ampere flows for one second.
6.24 × 10^18 electrons.
THE LAWS OF CONSERVATION OF CHARGE
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behavior and interactions of static electric charges;
the distribution of charge on conductors and insulators;
and
production and discharge of static electricity
WHAT IS AN ELECTRIC CHARGE
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COULOMB’S LAW
electric charge is a conserved quantity, meaning that it
can neither be created nor destroyed, only transferred
from one object to another.
These forces can be described using a fundamental
principle in electrostatics called the Coulomb’s Law.
states that the force of interaction between two charged
objects is directly proportional to the product of their
electric charges and inversely proportional to the square
of the distance between them.
𝑭=
𝒌 𝒒𝟏 𝒒𝟐
𝒅𝟐
where:
F = force of interaction (attraction/repulsion)
k = constant of proportionality known as Coulomb's constant
q1 and q2 = the magnitudes of the charges of the two objects
d = distance between the objects
CONSTANT OF PROPORTIONALITY, K
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used to relate the magnitude of the electric force between
two charged objects to their charges and the distance
between them.
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has a value of 𝟗. 𝟎𝟎 × 𝟏𝟎𝟗
𝑵𝒎𝟐
𝑪𝟐
.
DISASTER
 a serious disruption of the functioning of a
community or a society involving widespread
human, material, economic, or environmental
losses and impacts which exceeds the ability of
the affected community or society to cope using
its own resources.
Disaster are often described as the result of the
combination of:
1. Exposure to hazard
2. Conditions of vulnerability that are present
3. Insufficient capacity or measures to reduce or cope
with the potential negative consequences.
RISK
 The possibility that something bad or unpleasant,
such as an injury or a loss, will happen.