Download - Electrical Power Engineering Group
-
8/16/2019 Electrical Power Engineering Group
1/19
ELECTRICAL POWER ENGINEERING
ELECTROMAGNETIC WAVE
Dosen Pengampu : Victor Purnomo, M.Sc.
Oleh : Kelompok 1
-
8/16/2019 Electrical Power Engineering Group
2/19
M MB R OF GROUP 1 :
1. Ahmad Rizky K. !"1#1!!!
. Ayu $ri Septianingrum !"1#1!!1%
". &'isya Dianty (atma'a !"1#1!!%. &r)ina Diah !"1#1!!"
#. M. A*i' !"1#1!!"+
+. ahyu Au'ita Kartika R. !"1#1!!#%
-. Ri*i Putera /er0oto !"1#1!!+!
-
8/16/2019 Electrical Power Engineering Group
3/19
ElectromagneticWave?
-
8/16/2019 Electrical Power Engineering Group
4/19
ELECTROMAGNETIC WAVE
Electromagnetic waves are waves which can
travel through the vacuum of outer space.
-
8/16/2019 Electrical Power Engineering Group
5/19
ELECTROMAGNETIC WAVE
oo
c µ ε .
1=
o = 8.85 x 10-12 C2 /Nm2
o = 12.56 x 10-7 wb/amp.m
C = 3 . 108 m/sλ . f c =
= Frekuensi
= Wae!en"#$
C = 3 . 108
m/s
f λ
Electromagnetic
Wave
The vibration of
an electric
charge.
An electric
component
A magnetic
component
The speed ofelectromagnetic
wave :
3.00 x 108 ms
-
8/16/2019 Electrical Power Engineering Group
6/19
THE TYPES OF
ELECTROMAGNETIC WAVE
Electromagnetic waves
frequency and wavelength:
RadioWaves
icro!waves
"nfrared #isi$lelight
%ltra!violet
& rays 'ammarays
-
8/16/2019 Electrical Power Engineering Group
7/19
-
8/16/2019 Electrical Power Engineering Group
8/19
Radio waves have the longestwavelengths of all the electromagneticwaves( )he radio waves generated $y
electric charges are accelerated throughconductive wires( )he radio waves emittedfrom the antenna and received $y anantenna anyway
Radio Waves
-
8/16/2019 Electrical Power Engineering Group
9/19
icrowaves are shorter than radio waveswith wavelengths measured incentimeters( "f the microwaves area$sor$ed $y an o$*ect+ it will appear thewarming e,ect on the thing(
Microwave
-
8/16/2019 Electrical Power Engineering Group
10/19
-etween microwaves and visi$le light areinfrared waves( "nfrared rays produced $yelectrons in molecules vi$rate $ecausethe o$*ect is heated( )he amount ofinfrared light emitted depends on thetemperature and color of o$*ects(
Infrared
-
8/16/2019 Electrical Power Engineering Group
11/19
)he visi$le light spectrum covers thewavelengths that can $e seen $y thehuman eye( )his is the range ofwavelengths from ./0 to 00 nm whichcorresponds to the frequencies 2.0!/0
)34(
Visile Lig!t
-
8/16/2019 Electrical Power Engineering Group
12/19
%ltraviolet waves have the ne5t shortestwavelength after visi$le light( "t isultraviolet rays from the 6un that cause
sun$urns( We are protected from the 6un7sultraviolet rays $y the o4one layer(%ltraviolet light is used $y powerfultelescopes like the 3u$$le 6pace
)elescope to see far away stars(
"ltraviolet
-
8/16/2019 Electrical Power Engineering Group
13/19
&!rays have even shorter wavelengthsthan ultraviolet rays( 8t this point in theelectromagnetic spectrum+ scientists
$egin to think of these rays more asparticles than waves( 8n &!ray has astrong penetrating power(
#$Ra%s
-
8/16/2019 Electrical Power Engineering Group
14/19
8s the wavelengths of electromagneticwaves get shorter+ their energy increases('amma rays are the shortest waves in thespectrum and+ as a result+ have the mostenergy( 'amma rays are sometimes usedin treating cancer and in taking detailed
images for diagnostic medicine(
Gamma Ra%s
-
8/16/2019 Electrical Power Engineering Group
15/19
Energy in Electromagnetic wave
Relationship between electric field with magnetic field
Where :
Em, Bm = The maximum value of the amplitude of the medanelectric field with magnetic field
C = peed of light
c B
E
B
E
m
m=−=
t!"#$xcos
t!"#$xcos
ω
ω
m x
m y
B B
E E
=
=
-
8/16/2019 Electrical Power Engineering Group
16/19
Energi density of electric and magnetic fields
Energi densit! of electric field:
Energi densit! of magnetic field :
ue = Energi densit! of electric "#$m%&'( = ),)* x +(+- C- .+m-
E = electric field ".$C&uB = Energi densit! of magnetic "#$m%&B = magnetic field "Wb$m-&/( = 01 x +(2 Wb$3
%
0%
1
E ue ε =
0
%
% µ
B
u B =
-
8/16/2019 Electrical Power Engineering Group
17/19
Intensity of Electromagnetic wave
Electromagnetic intensit! or rate of energ! transferredthrough electromagnetic waves called pointing "&4
The intensit! average:
0 µ
EBS =
0% µ
mm B E
S =
5engan :
Em, Bm = The maximum value of the amplitude of the medanelectric field with magnetic fieldE = electric field ".$C&B = magnetic field "Wb$m-&/( = 01 x +(
2 Wb$3
-
8/16/2019 Electrical Power Engineering Group
18/19
Relationship between Intensity of wave with Energy average
B! using the formula
Energi densit! of magneticis is
The total energ! densit! is
The total energ! densit! average is
c
E
B =00
1
ε µ =c
e B u E
E c E B
u =====
%
0
0
00
%
0
%%
0
%
%
1
%%
% ε µ
ε µ
µ µ
0
%
% µ
B
uuuu Be B ==+=
c
B E u
mm
0% µ =
-
8/16/2019 Electrical Power Engineering Group
19/19
T&AN' (O"