Ac Definition and 1000 Threads

Im using the 7809 IC to get 9v regulated dc supply. However, I'm also getting about 14v ac in the output as well. I've tried putting a notch filter tuned to 60hz to remove the ac voltage, but its still there. I'm using this power supply to power tl072 op amps and I'm worried that the ac voltage...

Homework Statement An AC generator, originally designed to provide a peak output of +/- 155V at frequency 60Hz, is required to provide a peak output of +/- 340V at 50Hz. If the generator is connected to a transformer with 200 loops in its primary coil, how many loops should there be in the...

Can anyone help me convert 12v DC to AC for the purpose of measuring fluid permittivity in real time, automotive application? I'm new to PF and limited experience, so all the help/details you can provide are greatly appreciated.

if you connect a DMM across a 120V peak AC signal what should be your output in DC mode??

Say you have a conductor (a single straight wire) which goes from left to right across your computer screen and moves up and down in periodic motion in a constant magnetic field that goes into your computer screen (see diagram below). (note: you can ignore the computer screen, and you can...

i have an electric winch that runs off a 12v dc car battery and i want to run it off of 120v ac house electric current. is this possible, and if so how would i do it? thanks for any help

Homework Statement Hey. I am new here. Recently i got a C assignment (computing) in which i was given around 20 files..each with thousands of AC voltage test samples sampled at 1 ms..so technically 100 samples= 1 second. I was told that there 3 different kinds of frequencies in the files and...

Homework Statement Hello, I have one hard exercise, that I can't do. Sorry for my English, it's not my mother tongue, but maybe somebody could help. To charge a battery with direct current I, it takes t=8 h. But they didn't have a DC supply, so they charged it with AC, that was rectified...

greetings, when a transistor in common emitter configuration is given a ac signal with base current,the amplified output form from collector of it gives inverted polarity of the input voltage or the output graph of voltage versus time gets inverted of input graph of voltage versus time.how is...

capacitor question...(why does AC need a return path) say you have an ac power source (120 v) connected to a circuit which just has one parallel plate open air capacitor, with the plates separated by, say, 1 mm. you measure the current flowing through the circuit and you get some rms value...

OK, here's what I'm doing: I currently have a single 20 watt halogen puck: [PLAIN]http://www.lightingfx.com/media/images/product_category/ro29.jpg powered through a rectifier from AC. The reason I've done this is because I need the interrupt the AC with a light timer switch. I want...

I'd like to stick an ac adapter onto a circuit such that when the adapter is plugged in it runs on the ac adapter, but when it isn't plugged in it runs on batteries. Anyone know of a quick elegant solution? I'm sure these circuits get made all the time, but I can't seem to find any! I'm...

1. The problem Remember that acceleration is a change in velocity. There are 3 driver-operated controls in an automobile that will cause the automobile to accelerate. 2. The attempt at a solution Is it axis of rotation, tangential speed, and uniform circular motion?

Homework Statement [PLAIN]http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs894.snc4/72731_10150110340044992_712009991_7710053_709779_n.jpg The circuit has a non-ideal inductor with parasitic R. v0(t) goes to coswt as the limit of w goes to zero. The output signal has a +15 degree phase...

Hello, I have a small 9hp engine with electric start and a stator that puts out between 5-18 volts ac, it only has one wire coming out and would like to convert it to dc to run lights and charge my battery on a cushman scooter. any help would be appreciated...

Hi, I have a basic understanding of electrical wiring from when I was in school, and have a question that I have always wondered about that I hope someone could answer. My electrician mate tells me for household wiring its important for active and neutral wires not to be mixed up. That...

Homework Statement An electric motor draws a 1A (rms) from the 230V (rms) mains. and is found to shift the phase of the 50Hz alternating current by 30% of the period. What is the self inductance of the coils in the motor? Homework Equations The Attempt at a Solution i've started...

Homework Statement If possible, find reasons why the resistance of a resistor may have a different value when measured with a sine wave signal (a.c.) than when measured with a d.c. (dirrect current) source. Homework Equations The Attempt at a Solution Please correct me if anything...

My knowledge of AC voltage is very basic but I have a question. I stumbled upon this by accident. If you take a piece of aluminum, stick one one end into the ground just a little, say 1". Then take a volt meter, stick one lead into the ground, the other lead anywhere on the aluminum...

Why is AC more dangerous than DC even if the peak voltage of AC is the same as the DC voltage? This is a problem from our exam. Before I read the question I always thought that AC is more dangerous than DC because at the same voltage, AC voltage is higher as it has a peak voltage than DC. I've...

Homework Statement Hello i just have an interesting question, and was wondering if my answer to it had any validity. Ok so i did an experiment The Current balance experiment(for everyone not familiar with it, you can google it and get all the info you want) to try and estimate mu naught...

Homework Statement A series circuit contains only a resistor and an inductor. The voltage V of the generator is fixed. If R = 12 ohms and L = 4.5 mH, find the frequency at which the current is one-half its value at zero frequency. Note: The ac current and voltage are rms values and power is...

Homework Statement I have three questions 1. How do you find AC voltage across resistor when there are both AC and DC current? 2. is AC voltage across a resistor different from voltage across a resistor? 3. Find AC voltage across Resistor (in this image) http://img199.imageshack.us/i/acv.gif/...

I am constructing a small wind generator for a college project. I want the 0.1 V AC output of the generator to charge a battery. To do this, I need to convert the current into DC. I am familiar with things like bridge rectifier circuits, but the smallest diodes I can find have a forward "turn...

One of my friend says that it is possible that there will be no magnetic filed around an AC current carrying wire but he did,t know about the reason. can anyone give the reason

Homework Statement You don't even have to read the whole thing... just the red part is sufficient. I saw this on the homework: V= (100 v) sin (1 000t) What does this mean? ----- Can I treat it as having 100 real magnitude and 0 imaginary magnitude (and therefore 0 phase angle)? or does sin(1...

Hello, My prof showed a way of dealing with difficult circuits using complex numbers. But I have no idea what he was on about, and can't find that method in any book. Does someone know what I'm talking about, and can someone point me in the way of some materials for this? Thanks!

Homework Statement I am given an RC circuit with an alternating current. The circuit contains a capacitor and a resistor in parallel. Part (a) says "Use KCL to find a differential equation for I in terms of V." Part (b) says "For an applied voltage V = Voexp(iwt), find the current I."...

Hi Everyone, It is great to be here. I have a problem concerning the estimation of power of AC Adapters that are used for the charging Forklifts batteries. What data would I need to calculate the Power of such charger / inverter ? Thanks, Marcin.

Homework Statement I was able to find the solution to this problem but I don't understand where it comes from. A series RL circuit is connect to a 110-V ac source. If the voltage across the resistor is 85 V, find voltage across inductor. Homework Equations Not sure. The...

Homework Statement The output voltage of an a.c. generator is \emph{V}=\emph{NBA}\omegasin(\omegat). When the voltage is connected across an inductor, the rms current in the inductor is found to be 10mA. What will Be the rms current if the rotating speed of the coil inside the generator is...

Hi My GEM PK5(keyboard) ac adapter broke down. I used an alternative ac adapter on 12 volts but the whole keyboard shuts off and then on everytime I play on the keyboard when the volume is high enough. The original keyboard is big in size and the alternative ac adapter i used is small I am not...

I have a company that makes electrical resistance heaters. We have an application where we are trying to achieve 60 or less watts in a 5' 120VAC heater. The problem we have is that the heating element wires need to be on the order of 24ohms/ft and that ends up being a small gauge wire (ie 40 ga...

Homework Statement For which of the following AC circuits does impedance depend on frequency? A circuit with Check all that apply. a resistor and inductor. a resistor and capacitor. only a resistor. Homework Equations The Attempt at a Solution I think that for a capacitor...

In a typical full-sized home AC system [central air] is there a problem with oversizing the condenser? In particular, the idea is to add a pre-cooler just before [above] the condenser. This would provide additional cooling as well as increasing the volume of the system. I tend to assume that...

So i know the whole picture starting from power from the generating plants that go all the way to our homes..and the ground serves as a return path to complete the circuit..What i don't get is...how does that current find its way back to the source through ground?..is the source somehow...

Regarding this topic, https://www.physicsforums.com/showthread.php?t=421945" a question sprung into my mind. How many conducting cables go to my home circuit to deliver the power from the grid? If heard these electrician's jargon words: 1) phase (up to 3) 2) null 3) ground...

Can anyone tell me what the most standard way of changing the frequency of an AC power supply is? Can it be done with circuitry or does the method of generation need to be set at the desired frequency?

Hoping that one of you electrical wizards may be able to help me out! I have a 30A DC HP power supply and a 1000W stereo amp that I want to use create a 10mT static DC magnetic field superimposed on top of a 1 mT AC magnetic field. To generate the AC field I have a 1 uF snubber cap. in series...

Homework Statement A resistor of resistance R is connected to an AC generator with EMF(t)=(EMF_max)sin((w_d)t). (a) Write Kirchhoff's Loop Rule for this circuit at a particular instant of time. Is your result a differential equation? (b) Find the current as a function of time. Now...

I have created blueprint for a DC generator.THEORITICALLY it is 100% power efficient,it involves no AC in PRODUCTION,i need to know whether AC devices we work daily cope up with dc power or not?

I need to replace an air conditioner compressor unit that sits on the 2nd floor walk way on my stilt home in the Florida Keys. The walk way is 24" deep and the original AC unit fit that dimension, however, the new unit is 31" square. When I install the new unit I would like to leave a 18" space...

Hi all, The country where I live, electricity outages are a part of life, so to compensate for it I have a small 2.2kW 220V AC generator in my house. The problem with it is that I've heard and found out for myself that its output is unfit for running electronics. Testing with a...

hey, i am trying to find what is the process going on in the conductor while conducting ac. what is happening to electrons? what is the physical meaning of negative voltage in sin curve?

I need a solution to the question, Which clamp-around-the-cable ammeter (digital or analog) can be trusted in measurement of current draw by a high-frequency AC tig welder? High-frequency AC is a requirement of welding aluminum, and an electrician measured 150+ amps at full power welding...

A 50.0mh inductor is connected to an ac voltage source of 24.0V.The current flowing in this circuit is 0.60A.The frequency of the voltage source is : a)50Hz b)60Hz c)1.27*10^3 Hz My Work so far ! : f = w/2pi. But here we have L , E and i. Any help will be welcomed.

Hi this is my first post on here I am looking to create a large voltage across a primarily capacitive load at around 190 kHz. At the moment i have a 175 Watt power amplifier which puts out 55 Vp. The output impedance also needs to be quite low < 100 ohms Does anyone have any idea how to...

40<50degrees + 20<-30 degrees, I get how to convert to rectangular, I got 43.03 + j20.64, but converting it back to polar... how exactly do you do so? The answer is 47.72<25.63degrees... my book doesn't explain it. Also with (2+j4)(3-j5)... how exactly do you tackle this sort of...

My understanding of how AC current works is that the current changes direction, so essentially the charges are oscillating back and forth along the direction of the cable. Then since accelerating charges radiate, this produces an EM wave which is what carries the energy. But my problem is...

I know how capacitors behave when connected to a dc voltage supply. For a simple RC circuit we have the time constant thing come up into the equations and then we can find the exponential fall of voltage and currents. but what I don't get is the what would be the behavior of the same in a ac...