ประจุไฟฟ้า electric charges
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ประจุไฟฟ้า Electric chargesTRANSCRIPT
What is an electric charge ?
กิจกรรมการเรียนการสอนรูปแบบ E-STEMบรูณาการ กิจกรรมการเรียนการสอนกลุม่สาระ
เตรียมความพร้อมสูป่ระชาคมอาเซียน
Electric charge experiment
Electric Charge
Electric charge is a basic property of matter.Two basic charges. Positive
and Negative
Each having an absolute value of
1.6 x 10-19 Coulombs
Where do charges come from?
Matter is made up of atoms.
++
+
–
––
+
–
Proton (positive charge)
neutron (neutral)
electron (negative charge)
atomnucleus
Where do charges come from?
If electrons = protons neutral
If electrons > protons gaining electrons,
negative charge
If electrons < protons losing electrons,
positive charge
Where do charges come from?
When a balloon rubs a piece of wool...
– electrons are pulled from the
wool to the balloon.
The balloon has more electrons than
usual.
+
+
+
+
+
–––
––
The balloon: – charged,
The wool: + charged
wool
Only the electrons can move.
Electric Forces
What is electric Forces ?
An electric forces is the forces between
particles that are caused by their electric charges.
What is an electric Forces ?
Electric Forces experiment
Experiments have shown that
Like signed charges repel each other
Unlike signed charges attract each other
Quantity of charge
q = Neq = Quantity of charge, Coulomb (C)
N = Number of electrons or proton
e = Charge of electron or proton
= 1.6 x 10-19 C
Quantity of charge
Find the net charge of a system consisting of 1.75 x 109 protons.
Problem
Find the net charge of a system consisting of 1.75 x 109 protons.
Problem
GIVEN:
FIND : q = ?
SOLUTION:
Quizs
What type of electric charge?
Positive charge
Object
1
What type of electric charge?
Negative charge
Object
2
What type of electric charge?
Neutral charge
Object
3
Which one of the following values is the smallest possible
amount of free charge that has been discovered?
a) 5.34 1020 coulombs
b) 1.60 1019 coulombs
c) 1.38 1023 coulombs
d) 6.63 1034 coulombs
e) 8.85 1012 coulombs
4
In order that the atom has a neutral
charge, what is the proper
configuration of the sub-atomic
particles of the atom?
1. Number of neutrons = Number of electrons
2. Number of neutrons = Number of protons
3. Number of protons = Number of electrons
4. Number of protons + Number of neutrons = Number
of electrons
5
Which subatomic particles of
an atom move most easily
from one material to another?
1. Electrons
2. Neutrons
3. Protons
4. None – No subatomic particles move
6
In the triboelectric series, wool has
a greater potential to give electrons
than copper. If wool and copper are
rubbed together, what charge will
occur by friction on the wool?
1. A negative charge
2. A neutral charge (i.e., electrons will balance out)
3. A positive charge
4. None of the above
7
Find the net charge of a system consisting of 1 x 103 electrons.
q = Ne = (1x103)(1.6x10-19)= 1.6x10-16 C
8
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