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Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Intro > Overview
Opening
Message
This is the first lesson of the first module “Electric circuit” which will equip you with an arsenal of tools necessary to analyze an electrical circuit, especially single-phase and three -phase AC circuits.
1. Electrical Network and its Topology
A : Voice and PPT Overview
B : Text-based Overview
C : Video and PPT Overview
-2-
Lesson topics
1. Electrical Network and its Topology2. Electrical Quantities3. Circuit Elements4. Kirchhoff’s laws
Learning Goals
At the completion of this lesson, you will be able to:
1. Describe an electrical network with its topology and electrical quantities2. Analyze fundamental circuit elements: R, L, C, …3. Formulate equations of the two Kirchhoff ‘s laws
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Keywords
Electric chargeDefinite quantity of electricity, either negative or positive
Electric currentFlow of electric charge
A : Voice and PPT Overview
B : Text-based Overview
C : Video and PPT Overview
-3-
VoltageElectrical potential or potential difference expressed in volts
Electric circuit
Interconnection of electrical components (electrical network)consisting of a closed loop
Electrical resistance
Opposition to the passage of an electric current
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
Objectives:
• Describe an electrical network topology
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-5-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.1 Electrical Network and Circuits
• Electrical network: interconnection of electrical elements
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-6-
Closed circuit Open circuit
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.2 Representation
• From conceptual to physical representation
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-7-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.3 Network
• Branch: portion of a circuit with two terminals connected to it
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-8-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.3 Network
• Node: junction of two or more branches
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-9-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.3 Network
• Loop: any closed connection of branches
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-10-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 1 Electrical Network and its Topology
1.3 Network
• Mesh: a loop that does not contain other loops
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-11-
Mesh 1 Mesh 2
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 2 Electrical Quantities
Objectives:
• Review the concepts of main electrical quantities: current, voltage and power
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-12-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 2 Electrical Quantities
2.1 Current
Time rate of change of charge passing through a predetermined area
dt
dqi
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-13-
• 1 ampere = 1 coulomb/second
• Positive direction = Direction of positive charges
dt
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 2 Electrical Quantities
2.2 Voltage
• Or potential difference
• Total work per unit charge for motion of charge between 2 points
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-14-
i
uAB
A B
coulomb 1
joule 1 volt1
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 2 Electrical Quantities
2.3 Electric Power and Sign Convention
• Work done per unit time
Calculated at a branch or element
uiTime
Charge
Charge
Work
Time
Workp
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-15-
• Calculated at a branch or element
‒ If u, i chosen with the same direction:• p = ui > 0 receiving energy
• p = ui < 0 generating energy
‒ If u, i chosen with opposite direction:• p = ui > 0 generating energy
• p = ui < 0 receiving energy
i
uA B
i
uA B
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
Objectives:
• Analyze fundamental circuit elements: R, L, C, …
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-16-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.1 Sources
• Ideal Voltage Sources
‒ Constant voltage
‒ Current determined by circuit
u(t) = -e(t)
u(t)e
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-17-
• Ideal Current Sources
‒ Constant current
‒ Voltage determined by circuitj(t)
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
Lesson > Topic 3 Circuit Elements
3.2 Resistance R
• Resistance to the flow ofelectricity
• Ohm’s law
• Ohms (Ω)
i
uR
R
RiuR
-18-
• Ohms (Ω)
• Conductance (s=1/ Ω)
• Extract work from electric circuit
• Power and energy:
2R Riiup
t
0
t
0
2dtRipdtW
1/Rg
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.2 Resistance
• Resistor
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-19-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.3 Inductance L
• Inductor
‒ Limiting current based on the rise and collapse of a magnetic field
• Ideal inductor
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-20-
• Ideal inductor
‒ Zero resistance
‒ Store energy in magnetic field
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.3 Inductance L
• Inductance L of the coil:
• When a time-varying current
wΦψwith i
w
iL
iuL
eL A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-21-
• When a time-varying current flowing through:
• Inductance unit: henrys (H), 1 H = 1 V*s/A
dt
diLeu LL
dt
diL
dt
deL
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.3 Inductance L
• Power and Energy Storage
‒ Power:
dt
diLiiup LL
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-22-
‒ Storage of energy in magnetic field:
t
0
2t
0LL Li
2
1LididtpW
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.4 Capacitance C
• Physical capacitor
‒ Store energy in the form of a charge separation
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-23-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.4 Capacitance C
• Ideal capacitor
‒ Open circuit for DC current
‒ Charge separation proportional to voltage
• Capacitance C: iC
CCuq
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-24-
• Capacitance C:
‒ Unit: farad (F) = coulomb/volt, µF, pF
• Under varying voltage:
uC
CCuq
dt
duC)Cu(
dt
d
dt
dqi C
C )0(uidtC
1u C
t
0C
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 3 Circuit Elements
3.4 Capacitance C
• Power
dt
duCu
dt
duCuiup C
CC
CCC
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-25-
• Energy Storage
u
0
2CC
t
0
CE Cu2
1duCudtpW
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 4 Kirchhoff’s laws
Objectives:
• Formulate equations for circuit analysis based on the two Kirchhoff’s laws: KCL and KVL
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-26-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
4.1 Kirchhoff’s Current Law (KCL)
• Charge cannot be created but must be conserved
• Sum of currents at a node is zeroConvention:Currents entering a node are positive and vise versa
Lesson > Topic 4 Kirchhoff’s laws
k n
kk 1
i 0
i i
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-27-
Currents entering a node are positive and vise versa
• KCL equations:
• Write the equation for node C, anything to comment?
0iii- :A Node 521
0iii :B Node 435
R4
e4
e1
R1
L1
R3C2
C3
i4i2
i1
i3
i5A B
C
a b c
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Lesson > Topic 4 Kirchhoff’s laws
4.2 Kirchhoff’s Voltage Law (KVL)
• No energy is lost or created in a circuit
• Net voltage around a closed circuit is zero1 2k n k n
k kk 1 k 1
u e
k n
kk 1
u 0
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-28-
• KVL for loop (a):
k 1 k 1
11 1 1 2 1
2
di 1-R i L i dt e
dt C
R4
e4
e1
R1
L1
R3C2
C3
i4i2
i1
i3
i5A B
C
a b c
R5
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Practice > Exercise
• Write KVL equations for loop b and c with the direction indicated in the figure
‒ Put correct sign (+ or - ) into the blank
Loop b:
Matching
Fill in the blank
Drag and drop
-29-
R4
e4
e1
R1
L1
R3C2
C3
i4i2
i1
i3
i5A B
C
a b c
R5
3 3 3 4 4 4
3
1i dt R i R i
C= e
Loop c:
5 5 3 32 2
2 3
1i dt R i R i i d =
1
C Ct 0
Loop b:
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Outro > Discussion
At high school, did you use any laws similar to Kirchhoff’s laws? Find out some examples!
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-31-
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Outro > Summary
No Topic Summary
1
Electrical Network and its Topology
You can clearly describe an electrical network now and make it easy to apply later-on analysis methods.
Electrical Quantities You can explain basic electrical quantities in an electrical circuit and ready
A : Text summary
B : Visual summarizer
C : Video and PPT
-32-
2
Electrical Quantities You can explain basic electrical quantities in an electrical circuit and ready to use them in an analysis problem.
3
Circuit Elements From now on, you are able to analyze basic circuit elements and find the relationship between electrical quantities for an element.
4
Kirchhoff’s laws By applying the two laws of Kirchhoff, you can easily write equations relating electrical quantities and parameters elements.
Script Writing Guide: e-Learning Content Development for the 『 Project for Strengthen the CLMV Capacity for the ASEAN-KOREA Cyber University』
Outro > Next Lesson Guide
Ending Message
We have learnt aboutElectric Circuits
Electrical Quantities
Circuit Elements
Kirchhoff’s laws
A : Instructor’s video lecture
B : Instructor’s video and PPT
C : Text-based lecture
-33-
Next Lesson Title AC Network
Next topic
• Sinusoidal Voltages and Currents
• RMS value
• Sinusoidal Signal Representation
• Fundamental AC Circuits
• AC Power
• Power Factor Correction