This tag refers to alternating current mains power. It usually applies to voltages with >100V RMS, but can also be used for ex. 24V industrial AC power.

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29 views

Touching an AC wire

What will happen if a person touches a 220V AC live wire while he/she is not in contact with the ground?
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1answer
38 views

Does order matter when it comes to AC power?

Is there anything about electricity or the electrical design of AC power strips that dictates in what order the devices should be plugged in? When I say, "in what order", I am referring to the ...
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1answer
36 views

Is there a rightside up when plugging in an AC to DC power converter?

When plugging an AC to DC converter into an AC outlet, does it make any difference at all if the wall wort is "upside down" or "rightside up"? Is there anything about the electrical design that would ...
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0answers
28 views

how can i design a simple circuit that can be use to charge a DC(12v) using AC of 220-240V

pls I have an SLA battery of 12V I want to connect an AC of 220-240v to charge the battery. what are the processes?
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2answers
34 views

Can rms voltage change when peak to peak remains constant?

Can the rms AC voltage change with frequency? I have connected a DSO to the audio oscillator(having 10V p-p). Peak to peak voltage remains constant on changing frequency(10 Hz to 100KHz) but on ...
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0answers
41 views

Calculating signal attenuation for AC?

So we've got this; simulate this circuit – Schematic created using CircuitLab Which I've been told is equivalent to the sum of it's Coutputs to an AC signal; simulate this circuit ...
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2answers
32 views

Can a planar transformer replace a laminated transformer for 50Hz AC conversion?

I have seen planar magnetics transformers even with isolation up to 20 kV. However those devices seem to be designed for DC/DC conversion in 100 kHz range. I am wondering whether low frequency ...
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0answers
20 views

which type of rectifier would you use diodes with a (P I V)rating of 50 V??and Illustrates

For a peak output voltage of 45 V . In which type of rectifier would you use diodes with a (P I V)rating of 50 V??and Illustrates
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2answers
62 views

Very High speed response AC coupling

my goal is to achieve a HIGH SPEED RESPONSE AC COUPLING, as I want to totally get rid of the DC component even though its changing rapidly I have a signal coming from a sensor ( a proximity probe), ...
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2answers
43 views

Wiring up a AAA power toy to Pinball lighting supply

I'm trying to wire up a toy powered by AAA batteries (3vdc @ .09A) to the lighting circuit on a pinball machine (6vac @ 4A) and I was wondering what the best possible solution that I can keep small. I ...
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2answers
45 views

Close loop circuit vs an open one in regards to an electrical bicycle light system

From what I know about DC current, for it to flow you need 2 points with different voltage (while AC doesn't flow from point to point), this why DC batteries discharge overtime, when not used, because ...
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1answer
23 views

AC Machine Stator Winding

In designing a 3 Phase, 4 Pole, 24 Slot AC machine assuming a RYB phase sequence i am confused on the starting point of the blue phase. The calculations, table and diagram look like the following. ...
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0answers
18 views

How does Sensorless Vector Control of an induction motor achieved?

I'm trying to make sense of the current and rpm of an AC motor controlled by a VFD drive. Here is the device: ...
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1answer
44 views

Filtering the output of an H-bridge

What's the best way to filter the output of a H-bridge? I have a PWM output at +/- 20 V and I want to get a 10V RMS sine wave out at 50hz Also is there a way to do it without inductors?
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1answer
111 views

Current, Voltage, and Power Sensing for 115 V AC Circuits

I am trying to sense voltage, current, and power with an Arduino (Due) for monitoring and diagnostic applications. To get reasonably good input (better than Kill-A-Watt), I have designed an AC sensing ...
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1answer
27 views

AC alternative for DC diode short-circuit protection

I have two sensors (represented in the schematic below by a switch) connected to a light. If one of the sensors trips, I would like the light to switch on. The sensors and light are directly on AC, ...
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1answer
20 views

Rotor current paths and lamination in an induction motor

As far as I understood, the rotor currents circulate through the aluminium bars embedded inside steel laminations. But why do they use steel for laminations instead of an insulator if the the idea is ...
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2answers
50 views

Why does an induction motor not have the maximum torque when it is locked?

In theory the maximum current induced at rotor must be when the rotor is locked hence the force is B.I.L it must produce the max torque. But why torque is not maximum when it is locked but it is ...
0
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1answer
32 views

How is speed torque curve of an induction motor plotted experimentally?

I'm wondering how is obtained a 3-phase induction motor's speed-torque curve obtained. I couldnt find any procedure. Are they first applying fixed voltages with fixed freq. to stators. and then ...
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1answer
23 views

Calculating different rated power from the rated parameters for a delta AC motor

A delta connected motor in the following link: http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/ has rated current 47A, voltage 380V Here is the rated values. Cos(fi) = 0.8 on ...
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2answers
39 views

What is the relation between the stator current and motor rpm for an AC motor?

A 3 phase AC motor is rated values are: 970 rpm, 50Hz, 380V delta 47A. A VFD drives this motor for obtaining a constant wind-speed which rpm is proportional. The thing is when 885 rpm the stator ...
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2answers
37 views

How to determine the pole number or synchronous speed of an AC motor from its rated RPM?

Trying to to determine the pole number or synchronous speed of the following AC motor from its rated RPM. Here are the details: http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/ ...
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3answers
85 views

Function generator as a DC power supply

I'm wanting to start my own lab at home so that I can learn things faster than uni teaches (we're not allowed into labs unless we're in our own lab). A friend said that I'd be better off getting a ...
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0answers
15 views

PSpice Question (Wrong VAC IDC settings? iPRINT direction? or AC Sweep setting?)

I'm trying to use PSpice simulating this circuit: My drawing and setting are: But I think my result is wrong, which is: Looking at the answer of this question and using Matlab I get: I think ...
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0answers
8 views

PSpice Parts Setting Questions

Can somebody tell me how to set the "VAC" and "iPRINT" parts? Does the "VAC" part take to be sine or cosine ware? And does the "iPRINT" part follow what every "VAC" take for in terms of sine or ...
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2answers
64 views

What needs or works better with DC than with AC electric?

Solar power is becoming more popular, and it seems a lot of people who have solar panels have a DC to AC inverter. It seems ironic to convert DC electric to AC, and then the the AC gets converted back ...
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1answer
145 views

how does the circuit of a basic Variable speed electric drill work?

i am trying to 'automate' the control of an electric drill motor that im taking from a garden variety Variable Speed drill (from Harbor Freight) it has a universal AC motor which I basically ...
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3answers
88 views

Removing flickering of LED lightning

I am trying to install recessed, dimmable LED lightning in the living room. We're talking about an end solution of maybe 15-20 spot lights. My home has 120V/60Hz. Currently I am experimenting with a ...
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1answer
64 views

Correct Wiring of 1 phase 220v Electrical Motor

I am trying to install a single phase 220v electric water pump. I am fairly certain that it is wired correctly however the water pressure it is pumping out is absolutely useless. I have attached how ...
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1answer
58 views

AC voltmeter measuring different waveforms [closed]

If I measure a waveform using an AC voltmeter, what will be the value indicated if it is a triangular wave square wave sine wave
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1answer
56 views

floating ground for AC and DC power supplies

I wanted to connect two power supplies, one is AC (240V , 6A) and the other is DC (3,3V, 300mA). But i read in some referrence that connecting AC and DC power supplies could be dangerous if the two ...
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2answers
69 views

Mixing two or more AC sources to handle overload

Can I mix two or more AC sources to handle overload and maintain a stable voltage of 230V AC? For example if power from solar panel cannot handle a heavy load can I mix power from different source ...
0
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1answer
52 views

Hair straightener resistance

I'm a beginner with electronics. In the pictures below, you can see a hair straightener. The orange and blue wires are for the 230V, AC . What I can't understand is: Why is there a resistor (number ...
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0answers
40 views

AC Coupling Capacitor Value

How to Calculate the value of the AC coupling Capacitor?
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0answers
31 views

Mutually Coupled Inductors

Hello there im working on a project in which i'm making a wireless mobile charger. Im using two mutually inductors for transferring power wirelessly i want to transfer 14V (AC) from my primary coil to ...
0
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1answer
52 views

Using a multi tap transformer

I'm new to electronics I have need some help with a power supply design I am designing. I currently have a 0-30 volt, 2 amp multi tap transformer that I am using for the above mentioned power supply ...
0
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1answer
55 views

Dual Dc regulated voltage circuit design

I'm working on my term project which is designing a dual DC regulated voltage that gives a DC voltage between +or-ve 3 to +or-ve 15. I have completed the testing for positive DC output part, but I ...
0
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1answer
61 views

AC Single pin Male/Female Plug

Is there any single pin AC Male/Female plug is available? What is it called? I tried a lot searching on google but didn't find anything. I am looking something similar to RCA Cable for transmitting ...
0
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1answer
104 views

Transformerless power Supply - 24VDC, 120V AC and 230V AC

I want to know if it is possible to design a power supply for a circuit that can operate from DC and AC using the same input terminals. Thus, the output should be xxV DC (5-24 or whatever is decided ...
2
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2answers
129 views

My Chua's Circuit is flatlining (i.e., malfunctioning)

I tried to build a Chua Circuit, but it doesn't appear to be working as expected. The problem is that, while it's supposed to be an oscillatory circuit, I see no oscillations. Refering to the diagram ...
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3answers
75 views

Why is the rectifier necessary in this circuit?

I asked a previous question about this circuit: I am fairly confident that I understand why the transformer coil only sees something like 2V. What I am now unsure about is why the rectifier is ...
2
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2answers
51 views

Switching polarity of rectified AC power with a microcontroller

I am trying to create a circuit that will allow me to control the polarity of the current flowing through a coil in order to attract or repel a magnet. I would like to use two MOSFETs in series since ...
2
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1answer
74 views

Meaning of AC15, DC1, AC1, and DC13 in relay durability curves

In the datasheet of the relay OMRO G7SA from the durability curve they specify the number of operations as a function of the contact current. Each curve is for a specific current and voltage. The ...
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0answers
33 views

connecting AC signal 250V to DC signal 3V3

I want to measure an AC and DC current about 250V for AC and 3V3 for DC, i want to use an LT1787 (High Side Current Sense Amplifiers) with amplier stage and DSP to acquire the value. The problem is ...
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2answers
83 views

How can I protect equipment plugged into ungrounded outlets?

I have an older house that does not have grounded outlets. Previously, I have used 2-prong to 3-prong adapters to plug in my equipment (which remove the grounding ability). I understand that this can ...
6
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3answers
499 views

Is the design decision for different frequencies in PAL and NTSC related to the AC mains power frequency?

In discussion a friend mentioned: In the original implementation of PAL and NTSC they used the AC current as a means providing the frequency for the TV. As the different mains had different ...
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0answers
34 views

a Half Rectified AC, filtered by an inductor in series

What does a Half Rectified AC, filtered by an inductor in series' Voltage will look like?? I think it would be still pretty much the same, or will it be much different than that?
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1answer
49 views

Using an AC speed controllet with an rectifier and dc motor

I salvaged a 12 amp motor from an AC lawnmower and wanted to use a motor controller to reduce the speed. This is the controller I used http://www.amazon.com/gp/aw/d/B00GMBYFRK. The motor is a dc ...
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1answer
40 views

Current limiting AC

I am currently experimenting with electrolytic marking. I use a DC bench supply with a current dial so I can drive the reaction with a constant current to keep the marking steady and as a plus keep it ...
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1answer
29 views

Open circuit test on rated voltage

In transformer, the open circuit test is performed at rated voltage and frequency. why so? How both of these factors i.e voltage and frequency affects the transformer working?