Ac Definition and 1000 Threads

Homework Statement What is the resistance between terminals AC? What is the resistance between AD? An underground telephone cable, consisting of a pair of wires, has suffered a short somewhere along its length (at point P in the Figure). The telephone cable is L long, and to determine...

I have a question about how much power I’m using to run a LED light that I modified to run off an AC-DC adapter instead of 3 AAA alkaline batteries. The light is a Sylvania Lighting Dot It Black Led Swivel, which uses about 1/4 of a watt (4.5 V X 54.7mA) on batteries. The light would dim...

What does it mean when you put on a AC voltage source (~) 50/60º. The book I've been studying from says the rms or peek voltage only. Thanks.

Hello, I've recently read a couple of things about brushless motors that have spurred quite a few questions. Googling has solved some of them, but I'm hoping that you can help with the rest :smile: Apparently there are two types of permanent magnet brushless motors - DC and AC. This is...

Hello to all, I'm a student of electrical engineering. We have learned the basics about AC induction motors and we learned that single phase motor cannot start by itself. There must be some additional part that will produce phase lead or lag in order to create rotational magnetic field. That...

We have adapted a 60W A/C Fan Motor, 1500 RPM to run two spindles one at 6000 RPM and the other at 500 RPM using pulley & belt. On continuous use the motor heats up excessively and a few fail. Load is winding of threads from a Cone to a bobbin. I need a few suggestion i) Can rewinding...

I am trying to determine the power requirements for an AC Motor for a Plunger type wave maker. Attached is the layout of the plunger and tank. The formulas that I think might be involved in solving this problem are below: P.E = mgh W= F x d Power= W/time Pressure= F/ area What I...

Homework Statement two alternating currents I1 and I2 flow into a circuit node,the output current I is given by adding I1 and I 2. find I and t, when I1 and I2 are as follows Homework Equations I1=5sin(50t +Pi/3) I2=6cos50t The Attempt at a Solution...

Hello All, I've been playing worth some DDS output filter and amplifier circuits in the simulator and have run into an interesting little problem. I want to make an output that can range from 0.2Hz to 20Mhz and so far I have built a very nice reconstruction filter that can give me a very...

Can someone give me a circuit diagram i can use to change the frequency of AC current?

There are two AC current carrying conductors.(both are of the same frequency) How do you compare the currents to know if they're not equal at all times...? Please Answer as soon as possible ...

The patent in the link explains that it reduces the work load on the compressor in a car air conditioner by using heat from the exhaust to super-heat the gas directly after it exits the compressor. Other than that it seems to be a normal air conditioner. I am having trouble understanding how...

I'm having a bit of trouble understanding how phasors/complex numbers are used to solve circuits which include capacitor, inductor and resistor components. Has anyone come across video lectures/youtube tutorials/websites that provide comprehensive solutions to a whole bunch of...

Homework Statement A coil is connected to a 60 Hz ac generator with a peak emf equal to 80 V. At this frequency the coil has an impedance of 14 and a reactance of 12 . a.) What is the peak current in the coil? answer-5.71 Amps b.)What is the phase angle between the current and the...

Is there anyone can describle phase ac?

Homework Statement The 40-lb ladder AC is leaning on a 10-lb block at B and a frictionless corner at C. Can the system remain at rest in the position shown? Consider both sliding and tipping. here is the picture of the problem http://www.flickr.com/photos/19566492@N03/4146098284/...

Homework Statement I've been going crazy over solving this problem properly. We were suppose to design a simple problem and then present it to the class, and i decided to solve this very question - is it more energy efficient to use the AC or open the windows on the highway? the CdA for the...

Homework Statement http://img196.imageshack.us/img196/1295/40343374.png This is a past exam questions which I am doing as revision, now I am confused about how to calculate the answers. The Attempt at a Solution I have tried using millmans theorem which is Vsn = (Van/Za + Vbn/Zb +...

What i know the most fundamental thing is that the emf supplies energy to the charges and these charges have to reach the other end(say for electrons to reach the + end). IN order to do that somehow or the other they have to drop their voltage or energy for this to happen . AC with inductor...

Where A and C are constants. Is there any analytic to solve for B?

Dear friends, I would like to know how can I remove an AC signal from a signal which is combination of AC+DC. AC signal 60V/50Hz DC=50V. Please suggest me a C code or any algoritham or a filter which can remove AC signal completely and I should be able to see only DC...

Hi, I am a bit lost with AC circuits on the whole and could use some dumbed down explanation on the matter. Taking an example from course material: (Components connected in parallel. "Ladder connection") ------ l l l l l J C L R l l l l l ------ Where J = 1 (30 degrees)...

Homework Statement What direct current will produce the same amount of thermal energy, in a particular resistor, as an alternating current that has a maximum value of 2.60 A? Homework Equations The Attempt at a Solution A DC would dissipate a constant amount of thermal energy in a...

Hey guys. I want to design an AC coupled amplifier, to be powered by a 12V supply. The input voltage should be less than 30mV and the gain of the circuit should be 24dB. The circuit has 2 stages with the gain of the 1st transistor amplifier being used to amplify the signal going into the 2nd...

i have a vent that is too fast and too loud, and it runs off of US standard ac. i was wondering if there is a (good brand name) device that could limit the rms voltage. i don't want a pair of resistors, that would heat up real fast. i need the voltage cut in half, approximately. an analog...

I want to know that is the direction of a single phase or three phase ac induction motor is fixed and it is clockwise? ...or it may be both anti-clockwise and clockwise..or it can be both directional for single phase and only clockwise directional for 3 phase?...thanks

What really is a sinusoidal wave current? What exactly is happening to the electrons that is different from a DC? Are there any readings you suggest that will give me more insight into this? Thanks in advance.

Homework Statement Need to draw a graph of the emf generated by a simple single-phase generator which has a coil of 200 turns. The coil is 14cm long and 9cm wide. The magnetic field in the generator is 0.15T. The generator coil is turned at a rate of 3000 revolutions per minute. Can someone...

Is it possible to combine two AC signals that are slightly out of phase, but have the same frequency, voltage and current through an inductor, resistor series network.

I'm sure my question is very simple to most of u guys. But I have the following confusion. Let's say we have an AC voltage source in a circuit. In rectangular form it's phasor form is v= -4 - 16 j . I want to write this phasor in polar form. Well, The phasor is in 3rd quadrant of complex...

Greetings, I would like to build a circuit that would switch 2 separate AC power sources to a single load. Here's what the circuit should do: Circuit has single AC output to a system which utilizes AC current Circuit has both a 120 VAC and 12 VDC input. 12VDC circuit is connected to an...

Homework Statement Hi, I found the following example in a high school physics book about electrical circuits. There's something about the example that I don't get, so I hope you can help me out. I give you the example text and the solution, and then I explain what I don't understand...

Homework Statement I have a couple of questions about one of my homework assignments any help would be greatly appreciated. 1. How do you find the Voltage drop of a Resistor in an AC Circuit is it similar to DC? V=IR The Resitor value is 68 ohms and there is an 80mH inductor in front of...

I've heard that frequency differences can cause the motor to rotate 17% slower than it normally would... UNLESS it is a universal motor. The device in question is listed as running on a universal motor, but is also listed as AC / 60hz only. Does this still apply? Thanks.

I have a AC induction motor,i use a strong clamper to lock the motor shaft.Then i switch on the power supply.? So,i want to ask is there the motor will become short circuit? Can i know what is the cause for this malfunction?Is that the motor stator burn out or they still got other reason...

Hi Guys, I looked so hard on the net, trying to understand something that I am struggling with for the whole day, but I ended up frustrated. I am working on my design project and was assigned a part conecnred with antennas, I am using the Antenna Theory Analysis and Design by Balanis to...

Replacing a Ni-Mh battery to AC input? Hello, I have a cordless drill which use a 14.4v Mi-MH batter source. The battery does not work anymore. It will costs me $150. Here is my question. Is it possible to replace the power source from the battery to AC adaptor. I mean as a DIY. I have done...

A)) A choke boil placed in series with an electric lamp in an AC circuit causes the lamp to become dim. Why? B)) A variable capacitor "added" in this circuit maybe adjusted until the lamp glows with normal brilliance. Explain how this is possible ATTEMPT: If V is the voltage of alternating...

Recently I found that, if I apply a sinusoidal current to a long solenoid I get a radiation from it. It is completely theoretical result. I want to verify whether my result is correct or not. For this verification I need either some experimental result or some theoretical explanation whether it...

Question: If we increase the driving frequency in a circuit with a purely capacitive load, do (A) amplitude Vc and (B) amplitude Ic increase, decrease or remain the same? If instead the circuit has a purely inductive load, do (C) amplitude V L and (D) amplitude I L increase, decrease or remain...

Hi! As what I have studied, to smoothen the half wave voltage produced by AC passing through a diode is placing a capacitor parallel to the resistor.If I want to add an inductor inside my circuit to smooth the half wave, where should the inductor place? Does inductor help in smoothing the half...

Hi, I'm new in this forum. Nice to meet you all. I'm currently working on a project that uses AC motor. The goal is to make a position control system for the motor. Currently I'm using the Altivar 16 Square D inverter to control the speed of the motor. It uses a logic voltage to control the...

Homework Statement One of the reasons we use AC power instead of DC is that with AC, we can use a single wire with a maximum voltage of 220V to return 660V. This is done by combining 3 lines of 220V into a single one. How can this be done without exceeding the wire's max voltage of 220V? My...

Hi there Im new to this site and i have noticed that you give advice to electronic questions. Presently I am studing electronics and on some of my course work i am having some difficulty in understanding some of the questions. such as, Q1 A conductor 300mm long moves at a uniform speed of...

Homework Statement A An AC generator supplies an rms voltage of 110 V at 60.0 Hz. It is connected in series with a 0.300 H inductor, a 5.80 μF capacitor and a 236 Ω resistor. What is the impedance of the circuit? B What is the rms current through the resistor? C What is the average power...

Motor: Delco - 1/4 HP - 5.3A - 1735 RPM - single-phase AC; 32 slots - 4 poles - I have run into conflicting terminology, so I apologize for any confusion - Each of the four poles in this motor's stator core contains three coils with two empty slots at the center for a total of eight slots...

Ok I've got an output from a mp3 player which has two channels (L & R) however the device I'm connecting it to can only output mono sound, so what I did was merely connect the left and right channel wires together but what I'm wondering is AC signals are not so clear cut to me, I'm currently...

Ive recently completed a project in microcontrollers (my first project with uc's actually) and I built a power supply which gives me 12v and 5v dc. I use a transformer to step the voltage down to 12v AC from mains and then the 12v AC is converted to 12v dc using a bridge rectifier with a...

It seems to me that solar power and air conditioning are made for each other. As of now there are several different companies making smaller adsorption/absorption AC units, but they are overpriced compared to their electric driven counterparts giving limited return on investment. Here's what...

Im not formally trained in electrical engineering but have recently been forced in the last 6 months or so to get up to speed on many elec eng power type subjects. One of which is AC versus DC. I understand the history/science of it and why AC eventually won out. However, one story I encountered...