Happy
or
Sad
1. Particles of the
substance at a
certain temperature
move at the same
speed and in the
same direction
Sad
2.Heat transfers
from lower to a
higher
temperature.
Sad
3.1 cup of boiling
water has a higher
temperature than
a 1 teapot of tap
water.
Happy
4. Heat depends
on the number and
speed of particles
that vibrate.
Happy
5.When object is
heated,it expands
Happy
MODULE 7
Basic
Electricity
Module 7
MELC’s
Infer the relationship between current and
voltage
Objectives
1.Describe Current,Voltage and Resistance
2.Explain Ohm’s Law
Module 7
Current,Voltage,Resistance
Ohm’s Law
Pre-test
1.
It is a difference in
electric potential energy
in joule/coulomb.
A.
resistance
B.
current
C.
voltage
2.
What is the SI unit of voltage?
A.
ampere
B.
ohm
C.
volt
3.
It is the number of charges passing
through a wire per unit time.
A.
current
B.
resistance
C.
voltage
4.
What is the SI unit of
current?
A.
ampere
B.
ohm
C.
volt
5.
It is the opposition to the flow
of electric charges as they
travel through a
conducting
wire.
A.
current
B.
resistance
C.
voltage
6.
What is the SI unit of
resistance?
A.
ampere
B.
ohm
C.
volt
7.
It supplies energy in an
electric circuit.
A.
load
B.
switch
C.
voltage source
8.
It converts electrical energy
into different forms of energy
such as light, heat, or
sound in an electric circuit.
A.
load
B.
switch
C.
voltage source
9.
Which of the following is
the correct statement of
Ohm’s Law?
A.
When current increases voltage
decreases
B.
When current increases voltage
increases
C.
When current decreases
voltage increases
10.
Which of the following
properties of materials does
NOT affect resistance?
A.
B.
C.
length
thickness
strength of the material
1.
It is a difference in
electric potential energy
in joule/coulomb.
A.
resistance
B.
current
C.
voltage
2.
What is the SI unit of voltage?
A.
ampere
B.
ohm
C.
volt
3.
It is the number of charges passing
through a wire per unit time.
A.
current
B.
resistance
C.
voltage
4.
What is the SI unit of
current?
A.
ampere
B.
ohm
C.
volt
5.
It is the opposition to the flow
of electric charges as they
travel through a
conducting
wire.
A.
current
B.
resistance
C.
voltage
6.
What is the SI unit of
resistance?
A.
ampere
B.
ohm
C.
volt
7.
It supplies energy in an
electric circuit.
A.
load
B.
switch
C.
voltage source
8.
It converts electrical energy
into different forms of energy
such as light, heat, or
sound in an electric circuit.
A.
load
B.
switch
C.
voltage source
9.
Which of the following is
the correct statement of
Ohm’s Law?
A.
When current increases voltage
decreases
B.
When current increases voltage
increases
C.
When current decreases
voltage increases
10.
Which of the following
properties of materials does
NOT affect resistance?
A.
B.
C.
length
thickness
strength of the material
1.
Current,Voltage &
Resistance
Flow
Energy
oppose
Current
Current
Current (I)
is the rate of flow of electric charges
from one point to another in a circuit.
It is measured in Amperes (A).
The standard unit of charge is
coulomb. One coulomb is the electric
charge of 6.25 billion electrons. So, if
a wire carries 5 amperes, 5 coulombs
of charges flow through the wire
each second.
Voltage
Voltage
Voltage (V)
what makes a current move,pushes
the electrons
It is measured in Volts (V).
Voltage does not go anywhere, it
only drives the charges to move.
Resistance
Resistance
Resistor-used to reduce
current flow.
Resistance (R)
Is the opposition to the flow of
current by the conducting wire.
It is measured in Ohms (Ω).
The electrical resistance of the wire
depends on its thickness, length,
conductivity and temperature.
Factors affecting Resistance
1. Thickness
Thick wires
have less
resistance
Thin wires have
more
resistance
Thick wires have less resistance,
Thick wires have greater crosssectional area for the electron to
flow than thin wires.
Factors affecting Resistance
2. Length
shorter wires
have less
resistance
longer wires
have more
resistance
Shorter wires have less resistance
Shorter wires have less resistance
than longer wires because longer
wires have longer path for the
current to flow.
Factors affecting Resistance
3. Conductivity
Copper wires
have less
resistance
Steel wires have
more resistance
Copper wires have less resistance
than steel wires of the same size
because copper has higher
conductivity than steel.
Conductivity
is the property of matter
that allows current to flow.
The higher the conductivity
of material the more
current can freely flow.
Factors affecting Resistance
4. Temperature
lower
temperature,has
less resistance
higher
temperature,has
more resistance
At higher temperature, atoms are
violently vibrating that can result
to greater collision, creating more
resistance against the flow of
current.
2.
Ohm’s Law
Ohm’s Law
The relationship among voltage,
current, and resistance
I= V/ R
Current is directly proportional to
Voltage and inversely proportional to
Resistance
60
12
Resistance
12 V
60 A
0.2
Choose the letter of the
correct answer.
1.
It is a difference in
electric potential energy
in joule/coulomb.
A.
resistance
B.
current
C.
voltage
2.
What is the SI unit of voltage?
A.
ampere
B.
ohm
C.
volt
3.
It is the number of charges passing
through a wire per unit time.
A.
current
B.
resistance
C.
voltage
4.
What is the SI unit of
current?
A.
ampere
B.
ohm
C.
volt
5.
It is the opposition to the flow
of electric charges as they
travel through a
conducting
wire.
A.
current
B.
resistance
C.
voltage
6.
What is the SI unit of
resistance?
A.
ampere
B.
ohm
C.
volt
7.
It supplies energy in an
electric circuit.
A.
load
B.
switch
C.
voltage source
8.
It converts electrical energy
into different forms of energy
such as light, heat, or
sound in an electric circuit.
A.
load
B.
switch
C.
voltage source
9.
Which of the following is
the correct statement of
Ohm’s Law?
A.
When current increases voltage
decreases
B.
When current increases voltage
increases
C.
When current decreases
voltage increases
10.
Which of the following
properties of materials does
NOT affect resistance?
A.
B.
C.
length
thickness
strength of the material
1.
It is a difference in
electric potential energy
in joule/coulomb.
A.
resistance
B.
current
C.
voltage
2.
What is the SI unit of voltage?
A.
ampere
B.
ohm
C.
volt
3.
It is the number of charges passing
through a wire per unit time.
A.
current
B.
resistance
C.
voltage
4.
What is the SI unit of
current?
A.
ampere
B.
ohm
C.
volt
5.
It is the opposition to the flow
of electric charges as they
travel through a
conducting
wire.
A.
current
B.
resistance
C.
voltage
6.
What is the SI unit of
resistance?
A.
ampere
B.
ohm
C.
volt
7.
It supplies energy in an
electric circuit.
A.
load
B.
switch
C.
voltage source
8.
It converts electrical energy
into different forms of energy
such as light, heat, or
sound in an electric circuit.
A.
load
B.
switch
C.
voltage source
9.
Which of the following is
the correct statement of
Ohm’s Law?
A.
When current increases voltage
decreases
B.
When current increases voltage
increases
C.
When current decreases
voltage increases
10.
Which of the following
properties of materials does
NOT affect resistance?
A.
B.
C.
length
thickness
strength of the material
Asynchronous