# What is Ac analysis: Definition and 22 Discussions

A solid-state AC-to-AC converter converts an AC waveform to another AC waveform, where the output voltage and frequency can be set arbitrarily.

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1. ### Investigating the Effects of a Common Emitter Amplifier

Summary:: Using a common emitter amplifier to pump up the input voltage, and studying the effects henceforth. Here is a circuit with 0.6V pk-pk input voltage (v_in) for the CE amplifier, 1.17 kHz frequency- For this, without C5 and R9, the AC and DC gain was -10. I was supposed to increase...
2. ### Understanding Voltage Distribution in AC Circuits

The problem is shown below: (I am only asking about part b) ^Above is the problem. Below is the solution to part b. They have claimed that we can set potential at C = D = u(t), and A=B=0. Why is this claim true? What I realize: By applying Kirchoff's across ACDB, Voltage across C1 = Voltage...
3. ### Facing issues in understanding a Purely Inductive Circuit

Consider a purely inductive circuit with an inductor of self-inductance ##L## and sinusoidally varying AC source of peak voltage ##V_{m}##. First of all, Why is ##V_{ac} = ε_{ind}## (where ##ε_{ind}## is the back emf)? Now, at ## t=0 ##, voltage is increasing at a fast rate. Hence, due to the...
4. ### Understanding the Phase Difference Between Voltage & Current in a Circuit

Consider a circuit with a witch, capacitor and an AC voltage source. The sinusoidal AC voltage source is depicted in the following graph: We know that, ##Q = CV## ##\frac{dQ}{dt} = C \frac{dV}{dt}## ##i = C\frac{dV}{dt} \tag{1}## So from the graph, the voltage increases rapidly around ## t =...
5. ### Engineering AC circuit: Find the current through the inductor & capacitor

Hi! I wonder if it is correct. Can someone confirm (maybe with a software) ? I(L) = I2 I(C) = I2 - I3 -- Thanks.
6. ### In AC analysis do I alternate the current and voltage?

Lets say I am analyzing a simple AC voltage source with a resistor. In the positive voltage peak then I will use V and I say current is flowing clockwise. When I am analyzing the -Vpk iteration then do I make the current counter clockwise too or do i keep it clockwise? Thanks.
7. ### Engineering Calculating the effective value and frequency of AC Circuit

Homework Statement For AC Circuit shown in the picture, ##C=60nF##, ##L=100uH##, ##X_3=-100Ω##, ##Z_2=50Ω## and ##Φ_2=\frac {\pi}{6}##. When the switch is closed the ammeter shows a current ##I_1=0.6A## and the voltmeter shows ##U_l=60V##. The measuring instruments mentioned are ideal...
8. ### A AC transport data query (using a PPMS system)

Hello and thanks for looking at this question. I have a semi-conducting sample which has been run on a PPMS system - measuring it's resistivity as a function of temperature. I switched to AC transport mode in order to measure the resistivity again while applying frequencies between 1Hz -...
9. ### KCL with phasors: how to proceed knowing effective values

Homework Statement I have the following problem. Consider a circuit node where 3 sinusoidal currents with the same frequency converge, i1 i2 and i3. Knowing that the effective values of i1 and i2 are I1ef=1A and I2ef=2A. What can we say about I3ef: Options: $$(a)1A \leq I_{3ef} \leq 3A$$...
10. ### Engineering AC circuit with a switch -- analysis

Homework Statement Given the circuit of sinusoidal current (attachment1) with given data: \underline{Z_3}=200(3-j4)\Omega,\underline{Z_4}=100(3+j20)\Omega,\underline{Z_5}=100(3+j4)\Omega,\underline{Z}=100(2+j5)\Omega,\underline{I_{g2}}=-10(2-j)mA. After the switch is closed, the increment of...
11. ### Engineering Circuit analysis -- Find active and reactive power in the branch....

Homework Statement Given the circuit of sinusoidal current (attachment 1) with given data: \underline{E}=100V,\underline{E_1}=40V,\underline{Z}=(10+j10)\Omega,\omega=10^5rad/s,L=1mH, C=0.1uF. Find \underline{I_L},\underline{U_{16}}, active and reactive power in the branch 2-5. 2. The...
12. ### Engineering RL circuit Q. I must be missed something simple

Homework Statement Homework EquationsThe Attempt at a Solution I would show my working, but honestly, I'd really just like a hint as to how to begin, because I've tried multiple different things and just gotten tangled up in multiple equations that are way more complicated looking than the...
13. ### Finding inductor value for same current/voltage phase AC analysis

Homework Statement In the circuit below, what should the value of L be at ω = 10^4 rad/s so that i(t) is in-phase with v(t)?Homework Equations The Attempt at a Solution I am a little uncertain exactly what is meant by i(t) being in phase with v(t). Do I assume that both are cosine functions...
14. ### What is small signal AC analysis?

I have designed a common emitter amplifier using a BJT and I need to perform a DC analysis, followed by a small signal AC analysis, on it. Before I continue, I will admit that this is homework, but please don't stop reading yet. I am not looking for anyone to do these analyses for me, but I...
15. ### Help with complex numbers in AC analysis

Homework Statement Ok so before I begin I've done my share of research and have had no luck as people seem to be moving to calculators for answers these days. I know my rectangular and polar conversions in AC but I haven’t done too much work with complex numbers. I basically have two...
16. ### AC Analysis Query Homework Solutions

Homework Statement I have two questions to two different problems. The first: The Attempt at a Solution My attempt: Thing is, the solutions have V2=4.986\angle111.45(degrees) and i can't seem to get to that answer at all? What is wrong with my attempt because i can't see anything...
17. ### Thevenin equivalent q. (AC analysis)

Homework Statement ^We're asked to find the "Thevenin's equivalent circuit for the source" The Attempt at a Solution I'm a bit unsure how to start this problem. What i initially thought was that i'd combine all my impedances in parallel to the point where it's them combined plus the...
18. ### Ac analysis with dependent source

Homework Statement Determine I1 independent AC voltage source 10 cos 10^5t inductor 60mH capacitor 5nF dependent voltage controlled voltage source 3Vx Homework Equations KVL & KCL The Attempt at a Solution \begin{array}{l} - 7.071 + 6000I_1 - j6000I_3 = 0 \\...
19. ### AC analysis, multiple frequencies.

Homework Statement http://www.aijaa.com/img/b/00322/3721717.jpg http://www.aijaa.com/img/b/00092/3721734.jpg Both supplies are basic sine waves and the frequency of the supply 2 is 100Hz. The assignment is to calculate the power that is transformed to heat (i.e the power the resistor is...
20. ### Solving Basic AC Analysis: Find RMS Voltage Across R3

Heres a problem I was working on that I just was checking to make sure I attempted correctly...Im mechanical but had to go back and refresh on basic circuit laws... The question is just to find the RMS voltage across R3 Heres my work...
21. ### In the middle of an AC analysis problem, I am stuck -

OK, I have this complex number equation: 5\,V\,=\,\left[\left(j2\,+\,1\right)\,\left(1000\,-\,j10000\right)\,+\,\left(200\,+\,j2000\right)\right]\,i_L Now I try to solve for i_L: i_L\,=\,\frac{5\,V}{\left(j2\,+\,1\right)\,\left(1000\,-\,j10000\right)\,+\,\left(200\,+\,j2000\right)}...
22. ### AC Circuit Analysis: Solving 4x4 Matrix w/ Imaginary Numbers, Real #s & Phasor

Hey, This is a problem involving loop/mesh analysis on an AC circuit. I'm less confused about the circuit theory, I'm more confused with how to solve the resulting matrix. I get 4 equations with 4 unknowns... Which is something I'm accustomed to solving, but there are three different types of...