Download - Summary Chapter 1 & 2
-
7/27/2019 Summary Chapter 1 & 2
1/27
Chapter 1 & 2 Summary
-
7/27/2019 Summary Chapter 1 & 2
2/27
OHMS LAW
IRV If R is constant;
V is directly proportional to current
-
7/27/2019 Summary Chapter 1 & 2
3/27
SERIES CIRCUIT
-
7/27/2019 Summary Chapter 1 & 2
4/27
PARALLEL CIRCUIT
-
7/27/2019 Summary Chapter 1 & 2
5/27
Voltage Drop and Voltage Divider
Rule
Only applicable in series circuits ascurrent flowing through the circuits is
the same.
-
7/27/2019 Summary Chapter 1 & 2
6/27
Current Drop and Current Divider
Rule
Only applicable in parallel circuit asvoltage on each circuits is the same.
-
7/27/2019 Summary Chapter 1 & 2
7/27
Power and Units
Electrical power can be related by:-
P = V X I (J/s or watt)
P = I2 X R (J/s or watt)
P = V2 / R
-
7/27/2019 Summary Chapter 1 & 2
8/27
Find:
a) RT
b) IT
c) I1 & I2
d) Power at
each load.
TUTORIAL
5V
2
4 6
I1 I2
5
3
I3
-
7/27/2019 Summary Chapter 1 & 2
9/27
-
7/27/2019 Summary Chapter 1 & 2
10/27
Direction Rules
Electron Flow
-
7/27/2019 Summary Chapter 1 & 2
11/27
Magnetic Flux Density
Flux is line of force induced bymagnets.
Magnetic flux density is the amount of
flux passing through a defined areaperpendicular to the direction of flux.
Magnetic flux density can be
represented by Tesla.
-
7/27/2019 Summary Chapter 1 & 2
12/27
Magnetomotive Force
Magnetomotive force (mmf) is thecause of the existence magnetic flux
of a magnetic circuits.
Where N is the numbers of conductor
turns and I is the current flowingthrough the conductor
-
7/27/2019 Summary Chapter 1 & 2
13/27
Magnetic Field Strength
Magnetic Field Strength is themagnetomotive force relative to the
mean length of the flux path in meters.
-
7/27/2019 Summary Chapter 1 & 2
14/27
Flemings Left hand Rule
(Motor Rule) Determines vector of each variables
involved in a motor.
-
7/27/2019 Summary Chapter 1 & 2
15/27
Factors Affecting
Electromagnetic Strength
Current, I
Flux Density, B
Conductor Length, l
E ti R l ti
-
7/27/2019 Summary Chapter 1 & 2
16/27
Equation Relating
Electromagnetic Force and
ElectricityForce, F = Flux Density, B X Current, A X
Length, l.
Flux Density, B
-
7/27/2019 Summary Chapter 1 & 2
17/27
Flemings Right Hand Rule
(Generator Rule) Identifies the vector for each involved
variables for a generator.
-
7/27/2019 Summary Chapter 1 & 2
18/27
Relationship between
Electromotive Force Electromotive Force (e.m.f) is
generated by the changes of flux
when conductor moves across a
magnetic field. Potential of e.m.f generated is
proportional to flux density, the length
of conductor and speed of conductormoving across a magnetic field,
-
7/27/2019 Summary Chapter 1 & 2
19/27
Mutual Inductance
The magnetic flux through a circuitrelating to the current in that circuit
and the currents in other nearby
circuits. Mutually induced e.m.f in the second
coil.
The relationship of the current flow infirst circuit and the induced e.m.f in
second circuit is related by :-Where M is the mutual inductancebetween the two circuits (Henries)
-
7/27/2019 Summary Chapter 1 & 2
20/27
Mutual Inductance in Two
Circuits
-
7/27/2019 Summary Chapter 1 & 2
21/27
Mutual Inductance
The magnetic field produced by circuit1 will intersect the wire in circuit 2 andcreate current flow.
The induced current flow in circuit 2will have its own magnetic field whichwill interact with the magnetic field ofcircuit 1.
At some point P, the magnetic field willconsist of summation of current flow incircuit 1 and current flow in circuit 2.
-
7/27/2019 Summary Chapter 1 & 2
22/27
Example
-
7/27/2019 Summary Chapter 1 & 2
23/27
Example
-
7/27/2019 Summary Chapter 1 & 2
24/27
Example
-
7/27/2019 Summary Chapter 1 & 2
25/27
Example
-
7/27/2019 Summary Chapter 1 & 2
26/27
Example
-
7/27/2019 Summary Chapter 1 & 2
27/27
Example