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


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!!+!


3/19

ElectromagneticWave?


4/19


Electromagnetic waves are waves which can

travel through the vacuum of outer space.


5/19


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


6/19

THE TYPES OF


Electromagnetic waves

frequency and wavelength:

RadioWaves

icro!waves

"nfrared #isi$lelight

%ltra!violet

& rays 'ammarays


7/19


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


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


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


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


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


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


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


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

=

=


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 =


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


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 =


19/19

T&AN' (O"

electrical power engineering group

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