Ac Definition and 1000 Threads

See picture, sorry that it's huge. V1 is a DC voltage and there is also an oscillating source of frequency omega. Let V be the voltage between the two resistors, I be the current exiting the cap, and I1 and I2 be the currents through the 2 resistors. Then we have: ## I_1 = (V - V_1) / R_1## , ##...

Homework Statement Homework Equations P=I*(I*)*R/2 The Attempt at a Solution R1 = 12 R2 = 20 L = 0.0531H C = 265.26*10^(-6)F W = 2*pi*60 L -> jwL = 20j C = 1/(jwc) = -j10 Mesh equations: Mesh 1 (left mesh, clockwise) -Vs +I1(R1+L+C)-I2(C)=0 Mesh2 (right mesh, clockwise) I2(C+R2)-I1(C)=0...

Current is in phase with voltage in series. What about in parallel?

My senior design adviser told me that the VFD must be the same brand as the motor that is being used, I'm not sure I believe this. I plan on using a GS1 series AC drive, here is a link; https://www.automationdirect.com/adc/Overview/Catalog/Drives/GS1_(120_-z-_230_VAC_V-z-Hz_Control) Here is a...

Ac motor is 1.12 amp 3000 rpm 60 Hz 1/30 Hp sealed ball bearing. I want to use a 12 V dc motor. Any help would be greatly appreciated. Thank you.

suppose there was no ground stick at power generating station . then there would be no reason for a person to get an electric shock. no need for ground wires. only live and neutral wire for domestic supply. why is the neutral wire connected to Earth at generating station

Hello, I'm a bit confused on the term current rating in an ac generator. Is it the one in that I can get in the formula: kW= V*I*PF*sqrt(3) ? or the one in kW= V*I*sqrt(3)? The problem is the data that I have is V, PF, kVA only. I can compute the kW using those data but I'm abit confused on...

I need guidance in the explanation of utilizing LED light bars for a different function then designed. I do stage production, sound and lights for concerts and would like to adapt these LED light bars to "blind" to crowd. My issue is that each light bar operates 12-30 Volts DC @ 300 Watts. In...

As per the diagram, how do i change the wiring of the equipment on the outside to achieve my desired setup?

Hey, guys. There is an interesting question about EM waves. I know electricity is transferred on transmission line as electromagnetic wave. But electromagnetic wave is one type of transverse wave, then how is AC electricity like? I feel it hard to imagine it. Besides, conductors could be used...

If i have two sinusoidal ac signals of 220V with the different phase angle i.e. there is some phase difference between them. Then can i make the phase difference zero?? Please tell

Homework Statement So I'm trying to figure out this problem: The base of our charging station is composed of a coil with N1 turns and area A1 connected to a 120 VAC, 60 Hz source. The device has a smaller coil with N2 turns and area A2, which when attached will fit completely inside the...

Homework Statement Two parallel wires have currents passed through them which are in the same direction. Draw a diagram showing the directions of the currents and of the forces on the wires. Alternating currents are now passed through the wires. Explain what forces would act if the currents...

Homework Statement Using the superposition principle, determine the current i(t. 2. Homework Equations Zc = 1/jwC Zl = jwL V = I*R I = V/Z The Attempt at a Solution First, I converted inductor/capacitor to impedance: L = 1.5H -> jwL = j * 10 * 1.5 = 15j C = 10mf = 1/(jwC) =...

I noticed that I could get a minor belt off my 3 x 1.5KW compressor. I attached my meter to a mains supply 'socket earth', and to 'the chassis'. I watched the AC voltage gradually rise... perhaps increasing in speed slightly as the potential difference increased between the chassis and earth...

well we have learned in school there are two types of current DC whichs direct and AC where the curve change dir alternately. so what if the the graph is not a sine curve or a cos curve. is there any other name for such types of current?

Hi, I'm going to pose my questions with a number of assumptions, so please pick me up on any that are wrong. I want to know the design choices behind electric trains historically and current, this will mostly require some context of induction motors and inverters. I don't know exactly how EMUs...

Hi, I have quite a superficial understanding of Droop control: http://www.openelectrical.org/wiki/index.php?title=Droop_Control https://en.wikipedia.org/wiki/Droop_speed_control I'm not after a super technically detailed explanation, but if anyone has any more detailed sources for how it is...

Homework Statement An internally compensated op amp has a DC open-loop gain of 1,000,000 (V/V) and an ac open-loop gain of 40dB at 10kHz. Provide the expected gain in dB at 1kHz... Homework Equations Please help, I don't know what to use for an exact answer. The Attempt at a Solution Beyond...

I'm working on a project with a team in building a motor. My task is to find a controller for the motor, but I haven't had much luck. Here are the specs for it : Permanent magnet synchronous motor, 3 phase 8 pole 2 layer winding 100 kw power 400V The motor is AC. If somebody can even point me...

I have a questions about AC and DC components being grounded to the same spot. I have a power supply box that takes in 120V AC and brings that into a transformer that converts it to 24V DC. On the way into the box the ground wire from the 120V AC is brought into a grounding terminal block and...

How are transistors able to amplify full AC signals? What I mean is that a transistor will conduct only if the base emitter junction is forward biased and when you apply high enough treshold voltage to turn it on. Like 0,6v. Then looking at the graph above, from 0 to 120 and from 120 to 0v the...

Homework Statement Given a sine-wave generator of frequency f having internal resistance R1 connected to a high-pass filter. If the generator shown in the dotted outlined box produces a voltage V0(t) = V0 cos(2π ft) with no load, derive an expression for the output voltage V1(t) = V1 cos(2π ft...

if i touch the live (single phase) wire , i will get a shock.But current will have to flow through the body , via the floor , walls of the building , and into the Earth . But cement has electric resistance higher than 1gigaohm so rms current = 220 v / impedance impedance > 1 giga ohm so rms...

I did a small project on ac power measurement using arduino a few months ago. But it was specifically for 50Hz supply only. I sampled the waveform in a 20ms interval and applied DFT to get the amplitude and phase. This works good when the frequency is between 49.5 Hz to 50.5 Hz. The aim was to...

Hello everyone, So I am doing this EMC course and got to a section about cable shielding. It was suggested that the best way is to have a 360 connection to the chassis and to connect the ground of the PCB to the chassis as to provide a better return path for the current. It has been suggested...

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...

Hi. Assume we have some circuit with resistance ##R##. In DC, the current ##I## linearly depends on the connected voltage ##V## by Ohm's law ##I=V/R## . In AC, we can independently connect any voltage and current to the system by using a transformer, provided we have a power source with...

Hi, can someone explain me the next experiment: If I have an AC coil on iron stick, and if I put Cu ring on that stick concentric with AC coil, when I turn coil power supply, the ring will levitate on some height. My question is: Powered AC coil produces an AC magnetic field. If I put a...

[Note by mentor: this post does not use the homework template because it was originally posted in a non-homework forum.] --------------------------------------------- Problem: What is the average power dissipated by a 25-Ω resistor in an LRC series ac circuit for which the power factor is...

Hi Air conditioner vs evaporative cooler: ratio of (BTUs/hr) / electrical watts I know evaporative coolers do not state BTUs/hr. I do not know why. Did anyone try them and record time taken to cool. I found this example, but I do not know if it is practically relevant...

3 forces, 5N,6N and 7N act on a particle which remains in a state of equilibrium. What is the angle between the 5N and 6N force?

Hello everyone. This is a very simple project that I intend to build. It involves a cooler full of ice and water, two 120mm computer fans, a 240mm computer radiator and a 600 gallons per hour water pump. All these will run off the cars cigarette lighter rated at 12 Volts. I need your help to...

I'm trying to determine the amount of load (power loss) a theoretical engine will suffer from an AC alternator, such as one you would find on an automobile engine, they produce something of 40 amps with 110 volts I believe? To be specific, I'm curious to know how much a theoretical engine would...

Hi there everyone, I'm doing some study on electronics and the section on the advantages of A/C over DC mentioned that AC has less copper loss (I^2 x R), But to me this seems contradictory to the skin effect. Could someone please tell me why AC has less copper loss.

Homework Statement Both diodes are ideal. Answers: (a) Vi (b) -Vi (c) -2Vi (d) none of the above Homework Equations Q=CV The Attempt at a Solution 1. For t=0 to Pi: Cap1 and Cap2 are in series and hence Q1=Q2, therefore Vc1 = Vc2. From this we get Vi = Vc1 + Vc2, hence Vc1 =Vc2 = Vi/2. 2...

Hi, I realized I didn't understand the physical model of something I know the theory of pretty well. I was considering the real power loss of an AC transmission line I2*R, then I realized that from source to load the electrons in an AC line don't actually move anywhere. (as far as I know) Yet if...

This snapshot is from the book Solid State Physics by Ashcroft,Mermin. They represented the Field and Momentum as the real part of a complex function. As far as what I understand, we represent fields in complex notations for our own convenience over the standard real representation which results...

Homework Statement I added a circuit that I drew in microsoft paint to add a visual. Sorry for its ugliness! ;D Homework Equations V = I*Z Ieff = I / sqrt(2) Qreactive = V^2 / Z Pavg = (power factor) * (Veff) * (Ieff) Sapparent = ((Ieff)*(Veff))/2 The Attempt at a Solution Since this is...

Hi, so I salvaged a 220v, 6.5 amp DC permanent magnet motor from an old treadmill and I was having some trouble with it. I believe that AC motors can simply be run from mains power (I have an AC motor from a dryer that I cut the wires from in order to bypass the circuitry and essentially...

Hi I thought I remember reading that transmitting power over 800km's is passed the break even point for DC vs AC. And I read that modern rail is starting to use 25KV AC, but aren't many networks bigger than that, specifically in NSW Australia, the according to wikipedia it's 815km, I'm not sure...

Homework Statement Find Vth and Zth. frequency = 2kHz Homework Equations w = 2 * (pi) * f ZL = j w L ZC = -j / (w * C) V = I*Z ZR = R The Attempt at a Solution At first I tried using nodal analysis which I receive the value V = 0 v. I believe this is because this circuit only has dependent...

Homework Statement Homework Equations V=IZ[/B] Zc = 1/(-jwc) Zl = jwc w = 2(pi)*f The Attempt at a Solution I'm teaching myself circuit analysis, and it's been rough. Ultimately, I been able to mostly figure everything out, but I've ran into a wall with AC. The main problem I am having...

When a supercooled type two superconductor is subjected to a static magnetic field, the superconductor pins to the flux of the field (the mixed-state meissner effect is apparent). What happens if it is subjected to a continuously changing magnetic field, assuming the superconductivity takes...

hi alll...we know that by changing the polarity of phase and neutral , direction of ac motor can be changed. but is there any automated device that does this job? ...

Hey guys, I need some help with replacing a blown capacitor. I've linked below to the machine we are working with, Penagos k-60. I'm not able to find any documentation on the capacitor. The one we took out of the machine today is so old that we aren't able to see any of the writing and it's...

Homework Statement Find the currents through ##R_3, i_1(t)## and ##R_2, i_2(t)##. I attached a diagram of the circuit (diagram.pdf). In the original diagram the currents I'm trying to find is marked going top to bottom, there's also no directions on the voltages in the original diagram but...

Hi, Could I please get some conformation and clarification: So the more phases an inverter has, the less ripple will be on the DC bus, and the higher the switching frequency the inverter is operating at, the closer the approximation is to a sine wave. These are the advantages? But what are the...

Homework Statement Graph ##V_{out}## Homework EquationsThe Attempt at a Solution When ##V_{in}=V## C1 is positive on the left and negative on the right, and C2 is negative on the the down side and positive on the upper side so there is no Vout?

Some say that AC should form a closed loop circuit for electricity utilization but is there really an loop from the Power station(hot wire) to the Ground(neutral) and then from Ground to power station so that it forms a loop?