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Alright...If u ask me did I study?I shall give u a solid NO!But did I start...Yes...I did start and I was trying to start...lol!=/ DAMN two days later is your electrotechnology paper...The easiest yet the hardest to score...=( Sooo ain't I suppose to start studying those chapters behind especially those sinusoidal equations like v(t)=Vp sin (2 pine ft) or v(t)=Vp sin (2 pine t / T ) OMG I actually remembered all these...-..- Alright this is gonna be a long post...let me revise what I have learnt so far...From chapter 3 the hardest topic haha!Lets start I know inductors are also known as XL and capacitors are known as Xc...So what is the difference between them?Let terrance the stupid ass tell u.Inductor has an angle of positive 90 while Capacitors has an angle of -90.Why?Because inductors leads current while current leads capacitor respectively.LOL!What about for addition and subtraction of impedence?SIMPLE MANN!Change everything to rectangular form and u will have to form an equation of Z=R+J(XL-Xc) TADA!haha...simple right?I learnt this is P1...=P Okay and I noticed something...this is for series what about parallel..let me teach u...Parallel most of the time ask us about current in each of the components...the resistance,the inductance current and the capacitor current...So what we need to do is we change the impedence of every components into polar form and then divide each component using the voltage source.Then the total current we need to plus them all together...using rectangular form again...simple right?Then for phasor diagram we just need to draw out everything...know which is I(current),E(voltage supply),Xc(capacitor),XL(Inductor) can alr...that's it!Yay!As for rms...We use Vp/square root of 2 when finding Vrms,because rms stand for root metre square.Then for Irms we use Ip/squar root of 2...haha cool eh...I actually know everything alright!Then to fnd the average value...we use eqn-(2Vp/pine) haha...then for initial phase tzero=(theta/2pine)times T!Haha...ok...I m not looking at the notes now...I m telling u from what I know...haha...alot right!Clap Clap...Lets go on to chapter 4...=) True power,reactive power,apparent power and power factor.Actually this topic is also hard...but I still remember a bit here and there...lol!Alright...from what I know...True power is like IsquareR,VI,Vsquare/R or maybe P=VIcosinetheta.Apparent power which is also represented by S have eqns like S=IV,IsquareZ or Vsquare/Z,where Z represents the total impedence of both resistance+reactance like capacitors and inductors.haha then they have the units of VA.For the reactive power...it is the power of reactance like capacitor and inductor.So eqn have IsquareX,Vsquare/X or Visintheta.then their units are VAR.Alright...What more...Power factor is represented by the costheta of the eqn VICosinetheta.However the power factor can be taken from those angles form from those phase angles ignoring any negative signs.LOL!Yeap.Here inductive is lagging capacitor is leading...Sooo Power factor of capacitor ques will be leading.EH LET ME MAKE THIS CLEAR...FOR APPARENT POWER...THE IV THE CURRENT IS THE TOAL VOLTAGE DIVIDE THE TOTAL IMPEDENCE OF BOTH THE RESISTANCE AND THE INDUCTORS OR CAPACITORS.yay!I m done...now lets go on to chapter 5...ok I know until here.TRANSFORMER.haha...easy topic but hard to score.Okk...let me start...for this topic what u have to know is for the transformers there are secondary coil and primary coil.primary coil are attached to the ac supply current while the secondary coil are connected to the load.As the ac supply current gives an increasing magnetic field which causes the primary coil to induce an electromagnetic force on the secondary coil through the mutual inductance of the iron core.They can be made of iron,ferrite or air.ferrite or air core are commonly used for high frequency applications while iron ore is made for audio or power applications.There will turns ratio...we have Np/Ns(number of turns of the coil),Vp/Vs(voltage of the coils),Is/Ip(current of the coils).When turn ratio is >1 it is a step down.When it is <1 power="output" efficiency="Power" load="1/4IsquareR.VsIs="VpIp.LOL!Yeap">
Anyway don't look at me soo slack...I do know some of these shit things alright!Anyway I m trying to make it historical by helping the slackers beat muggers!LONG LIVED SLACKERS!=P
Miss u...Aww....=)
Terrance 7:51 PM
