AC curcuit help?

Question

AC Curcuit help?
I am in school full time to become an electrician but i had surgery and i missed some things and i am trying to read and study but i cant figure it out on my own I am in AC curciut and need help with the XL and so on if anyone has the formulas it would really help me the text book is really complicated i have finals monday and if anyone can help id appriciate it

Answer 1

You know what helped me? The ARRL Radio Amateurs Handbook. Almost every library has them and they describe circuits in simple ways.

Two others are:

The Radio Handbook by William Orr

The RSGB Radio Amateurs Handbook

I know you're not studying radio, but electric theory is the same and these books demistify it.

Good Luck on your test:)

Answer 2

As you may know an AC circuit is the one which its current or voltage sources are sinusoidal waves. To Analise the circuit in steady state form, which means that you are only concerned with the circuit response after a long time of applying the input sources and you do not care about the transient responses which die out after several time constants, you need to use phasors (This needs some knowledge of handling complex numbers). Phasor is a complex number with amplitude and phase. So you model your sources with a complex number whose amplitude is equal to the magnitude of the source and its angle is the phase of the source. For the resistors the complex number is the same real number as resistor value.For a capacitor the complex number is equal to 1/(jwc) where j denotes the complex number and w is the frequency of your sinusoidal wave. For inductor the complex number equals jwl. After doing the previous step, you just Analise the circuit as ordinary resistor made circuit. The only difference is that you work with complex numbers.

Answer 3

XL = wL where w is 2 * Pi * Frequency



Similarly the reactance of a capacitor is 1 / ( w * C)



Hope this helps.

Answer 4

xl=2pi x Fl