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ELECTRICITY

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INTRODUCTION TO
ELECTRICITY
Objectives:
At the end of the lesson, the students are
expected to:
1. Define electricity.
2. Explain the electron theory in relation
to electricity.
3.
2
Definition of terms
o Current – is the intensity of the flow of
electrons in a conductor.
o Power – it is the total measure of electrical
energy consumed in a circuit.
3
ELECTRON THEORY
ATOM is the smallest constituent unit of
ordinary matter that has the properties of a
chemical element.
Every solid, liquid, gas and plasma is
composed of neutral or ionized atoms.
4
Composition of Atoms
PROTONS (+) are positively charged
particles.
ELECTRONS (-) are negatively charged
particles.
NEUTRONS (n) are neutral particles.
5
ELECTRICITY
•
Is a phenomenon which is known more
by its effects. You can only see, feel, or
hear its effect because it can produce
heat, light, sound and is able to cause
mechanical movements of things in a
certain place or from one
place to
another.
6
ELECTRICITY
•
•
Is defined as a basic form of energy
that’s is a property of a certain
fundamental particles of matter known
as protons and electrons.
Is the movement or flow of a electrons
in a conductor.
7
Kinds of Electricity
o Static
Electricity
–
electricity that is not in
motion or electricity at
rest.
It
is
usually
generated by means of
friction.
Example: Lighting
8
Kinds of Electricity
o Dynamic
or
Current
Electricity – electricity in
motion.
It
can
be
transmitted from one
place to another.
9
Properties of Electricity
o Current – is the intensity of the flow of electrons in
a conductor.
o Voltage – is the electromotive force (EMF) that
enables or pushes the electrons to flow in a
conductor toward a certain direction.
o Resistance – it is the force that opposes the flow
of electrons.
o Power – it is the total measure of electrical energy
consumed in a circuit.
10
OHM’S LAW
George Simon Ohm, a German
physicist discovered that voltage,
current, and resistance in a circuit have
definite relationship with one another.
*Current (I) is directly proportional to
Voltage (E) and inversely proportional to
Resistance (R).
11
In simple terms, it means two things:
1.
Current (I) is directly proportional to Voltage (E).
- An increase in voltage will result to an
increase in current.
2. Current (I) is inversely proportional to Resistance
(R).
- An increase in resistance will result to a
decrease in current.
12
To compute:
13
GROUP ACTIVITY:
In a ½ sheet of yellow paper,
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