What is Ac: Definition and 1000 Discussions

Hey there, I've been learning about AC circuits recently and while considering and LCR circuit it occurred to me; it's possible for the voltage drop across a capacitor/inductor/both to be greater than the voltage source itself however I can't think of the reason for this, any hints or reasons...

ok I am hooking a dc to ac inverter to a car battery then to a transformer that will give me 115vac then i need to convert it back to dc while still keeping the 115v but in DC how do i do this? If i use a rectifier will the current drop?

what is meaning of ac winding and dc winding?how it differs from each other? advanced thanks.

hi guys I am trying to fined Vo and Io using mesh analysis for the following cct The formulas I made from the cct using mesh analysis don't seem right here is what I have- loop1 2(I1 - I2) = 0 loop2 2(I2 - I1) + I2(j4) - 3Vo = 0 loop3 3Vo + I3(-2j) = 0 and I1 = 4<-30 vo...

The lines (AC) and (BD) intersect at the point P(3,K) Show K=1. AC=(4,2) or (x,y)=(5,2)+s(4,2) BD=(3,-6) or (x,y)=(1,5)+t(3,-6) A(1,0), B(1,5), C(5,2), D(4,-1) [PLAIN]http://img840.imageshack.us/img840/6263/1894869.jpg

Homework Statement An ac voltage source is connected in series with a 1 uF capacitor and a 750 ohm resistor. The amplitude of the voltage source is measured to be 4V rms while the voltages across the resistor and across the capacitor are 3V rms and 2.7V rms respectively. Determine the...

Homework Statement Hi In my book, they do calculations on a 2-level atom. After some approximations, they reach the following equation for the coefficient for the first (lower) level: c_1(t)\approx c_1(0)e^{-i|\Omega|^2t/\delta} where Omega is the Rabi frequency and delta is the...

Homework Statement Now suppose the power supply is 1200 V, and the motor is rated at 100 W at this higher voltage. If the wires have a resistance of 7.0 ohms, what is the voltage drop across the wires? The voltage at the motor? Homework Equations Power= Irms*Vrms V=IR The Attempt...

if a pure inductor is connected to an AC voltage source! The Back emf in the inductor=Thr instantaneous AC emf! THEN How can the current flow through the inductor if the NET VOLTAGE=0? please explain

Homework Statement Given the load impedence is 18 + j15 ohms, what is the line current. Follow this link to see the circuit and the variables. http://www.flickr.com/photos/61312863@N07/5584165017/ Homework Equations Vab = Van*root[3] angle 30 degrees Iab = Vab/Z Ia = Iab*root[3] angle...

what happens if AC is applied to a capacitor? I am able to understand that ,For 1st half of the cycle,i.e for +ve cycle, during the voltage rise from v0 to vpeak, the capacitor charges, and during the voltage drop from vpeak to v1 the capacitor discharges.Let me know if this is true. I...

Hello, I have this old Nintendo AC 220 V to 24 V 550 mA DC. it has this one full line followed below with dotted ones. Can you help me read this? And how do these adapters behave. Do they ALWAYS give 550 mA, no matter how much voltage drop is connected to the end? I am thinking...

Homework Statement What is the inductance in a series RL circuit in which R = 7.0 kΩ if the current increases to one half of its final value in 26 µs? Homework Equations am i correct in assuming that i should be using the time constant equation: Tau=L/R The Attempt at a Solution...

Okay, I was planning on building a Tesla coil for my (high school) physics class. For the high voltage capacitor I was planning on using a Leyden jar, however, after doing some research I only found references to it being used to store an electrostatic charge. Thus, my question is, can a...

I have a sinusoidal AC voltage with roughly Vrms = 50mV. I wanted to amplify with a non-inverting amplifier circuit with the LM358 op-amp. I used resistors of 100ohm and 10kohm for a theoretical gain of 100x. However, my output signal is rectified so that only the positive half of the signal...

So here is what I am trying to accomplish. I am trying to take an old Jacobs wind turbine controller that was designed for a grid tie application and make it off grid. There is a 3 phase "wild" ac input from the turbine that is rectifyed but not clipped by the internal SCR's to variable DC...

hello everyone, this is diagram from a book:- http://img816.imageshack.us/img816/4671/clipperac.jpg this is same diagram i have modified:- http://img849.imageshack.us/img849/1848/modifiedclipperac.jpg this is truth i don't understand how AC current work. let me tell you what i think of AC...

Please note, I'm not in school anymore -- just a basic physics question! Homework Statement A conductor is placed inside the coil of an induction heater. Imagine that the inductor coil has radius R, number of turns N, operating frequency f [Hz], drawing current I = I0 * sin(2*pi*f*t). The...

Hi, PF :) I was self-studying AC circuits, and my main goal right now is to understand impedance. However, before that, I was wondering how one would derive the formulas for alternating voltage (and current), namely http://upload.wikimedia.org/math/5/a/0/5a0ecaa1432c6cdce653a943b4962a21.png...

Homework Statement I'm struggling to figure out what vectors I use for my phasor diagram for an RLC series circuit. Homework Equations VC = 1/j\omegaC VL = j\omegaL VR = IZ The Attempt at a Solution I know how to add vectors, so that's not a problem, transfer my circuit from the time...

An AC circuit consists of 3 segments: a capacitor, then another capacitor which is in parallel with a resistor, and then finally another capacitor, these 3 segments being in series with each other. The formula which describes the charge Q(t) on the left hand side plate of the first capacitor...

Homework Statement A long circular solenoid of radius a and N turns per unit length has its axis in the z direction. A small highly conducting ring, or area A, resistance zero but self inductance L, is place with its plane horizontal and its centre on the axis and near the top of the...

Homework Statement An AC power supply with a peak volatge output of 200 volts, operating at 60 Hz, is connected to a 53 microFurad capacitor A) what is the difference in phase angle between the applied voltage and the current B) what is the rms current in the circuit C) what is...

How to test AC motor resistance test an continuity test for 3 phase

http://imageschip.com/image-2CC0_4D720BE9.jpg In AC circuit when the voltage is zero the current is maximum... When it reaches to 90 then the current is zero... And same as for the other cycles till 360... Why the current is maximum when the voltage is zero and when the voltage is maximum the...

I am confused when it comes to this AC circuit problem. It is part e. The back of the book shows that V_R3 = 100 V. But as you see from my calculations, I get V_R1 = 20 V and V_R2 = 100 V. So shouldn't V_R3 = 0 V because the original voltage source for this AC circuit is 120 V, yet the book...

I want to convert a mini split air conditioner from ac to dc so it can be powered by a 48 volt battery bank and rercharged by a solar panel and wind turbine hybrid system.(hybrid charge controller) I want to replace the ac compressor motor to a 48 volt brushless perminent magnet motor of...

I am helping out with the installation of an alarm system and need some info regarding earthing of low voltage transformer lead. The alarm system has a 3 wire 12 volt AC output power supply as well as a back up 12 volt DC battery which also contributes to the AC supply to the main ciricuit...

1. You have a series circuit consisting of a ac power supply, a 600 ohm resistor and a 73 nF capacitor. If the circuit is configured as a low pass filter, what frequency will cause the gain to be 0.25? 2. If the circuit is configured as a high pass filter, what frequency will cause the gain...

What type of power rating does a wattmeter measure in an AC RLC circuit? Is the power measured the apparent power or active power, and is this reading the rms value? Also which current value is taken by an ammeter in an AC rlc circuit? is this also rms value?

How can equipments work in ac current even it is oscillating from +ve to -ve and to zero? Alternating current is alternation of positive and negative values.If we consider the sinusoidal case,the current value becomes zero,negative,positive in a cycle.In that case,how can electrical equipment...

Trying this again from a different angle... Let's say we have a 120 Volt AC source. We'll call it a generator. This generator is not touching the earth. Let's just pretend that it's suspended in mid air with nothing at all connecting it to the ground (the earth). On this generator, there...

Hi, I am just thinking and i got doubt that if one wire carries AC(3V) and other wire carries DC(3V) and on the other side if you conntect together followed by a diode and last with one lamp. What will happen in that situation to lamp.

I saw this "AC anywhere" last week and was wondering how it works? How we can get 230 volts out of 12 volt DC supply? Isn't it drawing more power from less? [Below is the description of the Device which I'm discussing about] Running out of power is a thing of the past with the AC Anywhere...

im taking circuit theory 2, which is all about ac circuits, but don't have enough money for a book need a place to learn about how to calculate lead and lag based on the inductance and capacitance, nortons and thevinans and all that stuff but in the context of sinusoidal currents and voltages

Homework Statement A non inductive resistor takes 8A at 100 volts. What inductance of a coil of negligible resistance must be connected in series in order that this load can be supplied from a 220 volt 60 Hz mains. Homework Equations Z^2 = R^2 + XL^2 R=V/I XL = 2pi(frequency)...

Homework Statement An induction motor load of 2000 kVA has power factor 0.80 lagging. Synchronous motors totaling 500 kVA are added an operated at a leading power factor. If the overall power factor is then 0.90 lagging, what is the power factor of the synchronous motors? Homework...

Homework Statement An impedance 1000(1 + i) Ω (and note it contains an imaginary part) is connected across an AC voltage source of amplitude 10 V and frequency 60 Hz. Whatʼs the power dissipated during one cycle within the impedance? Homework Equations P = Re(V*I), where V* is complex...

Homework Statement An alternating current is running through a serially connected inductor(L) and resistor(R). The alternating voltage causing it is: http://upload.wikimedia.org/math/5/a/0/5a0ecaa1432c6cdce653a943b4962a21.png How does the voltage on the inductor change over time? Homework...

What are the factors that affect how much current is drawn into an AC induction motor? I don't understand how a motor draws more current to start. I get why it would need more to start but I don't get why it would draw current into itself automatically. It may not work like that at all! But I...

Similarly to air switches in hot tubs, I am looking for a UL Certified product that includes a SPDT switch, relay and transformer to plug into a standard 110V 15A outlet. The relay would be energized by the low voltage from the transformer and activated by the SPDT switch which would then switch...

Hi - I'm just starting to build a few basic circuits and am looking to get easy access to a low voltage ac power supply. I pulled apart a power brick, and it only has 4 diodes, a cap, and a transformer. If I pull out the cap and the diodes and solder the cord to the leads on the transformer, I...

Hi, I have forgo my previous idea of Tesla coil as my final year project and now moved on in doing an AC power meter monitoring, which monitors the kWh, voltage, current consumption of a device and remotely controlled switch to turn off/on the device.This power meter should be implemented like a...

Although this question may seem too simple, I still want to ask it on the forum because I’m really confused…… Here are the easiest amplifiers circuits for DC and AC currents, and what’s shown in the oscilloscope I’ve got in Multisim (corresponding), I want to know why ic/ib is negative in the...

greetings, consider a wire which is subjected to AC supply.now consider a point X anywhere on wire. now what will be the potential of that point during the positive and negative halfcycle of sinusoidal AC?what will be the direction of current? thanks

Homework Statement This problem arises from a much larger essay/lab/project thing. I know that there is an induced current in the wire of an AC electromagnet because the magnetic field is constantly changing along with the AC current, so it makes sense to me that will produce a constantly...

i am not sure if this is considered electrodynamics under classical forum but oh well, here goes i was reading wiki about p-n diodes and its that for reverse bias diode, because of the anode attracting the holes WITH the cathode attracting the electrons, the depletion zone widens and causes...

Hello All, I am interested in constructing a small Hofmann apparatus for electrolysis (as a hobby), like this kind: http://en.wikipedia.org/wiki/Hofmann_voltameter" I am confronted with the choice of either using a bunch of 9V batteries, or some kind of AC/DC rectifier. As I am a...

I just wonder if the readers here realize a couple of things. 1. Basic Ohm's law is different than the Laboratory Ohm's law. 2. If a DC voltage is applied to a resister, an AC voltage is always generated across the resister. I hate to use 'always' but as far as I know it is this way...

Please remember that I'm not a science or physics student, so please explain as simply as you can. Thanks. In the case of DC current electrons flow from a negative terminal to a positive. A negative terminal is full of electrons and the positive is electron deficient. I'm trying to understand...