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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Can someone help me with my homework

I need to solve the task shown on the picture. The given Values are: R1 = 6 Ω; R2 = 8 Ω; XL = 8 Ω; XC = 6 Ω. NEED to find: U1;U2;I1;I2;P. Can someone help me?
5
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1answer
58 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 ...
1
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3answers
74 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 ...
0
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1answer
47 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
55 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
51 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 ...
2
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2answers
61 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
47 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
33 views

AC Coupling Capacitor Value

How to Calculate the value of the AC coupling Capacitor?
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0answers
30 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
45 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
54 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
55 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 ...
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1answer
49 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 ...
0
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1answer
92 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
73 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
38 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
55 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
30 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
76 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
487 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 ...
0
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0answers
32 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
41 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
37 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
25 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?
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2answers
41 views

Confused about this KVL equation (AC circuit)

I have the following circuit below, with part of the solution: I need to find Z. I'm confused about the KVL equation below (fourth line): If I understand correctly, they used loop analysis: with ...
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1answer
60 views

AC-DC Adaptor flashes on & off

i have bought an ac-dc adaptor to power my mini-water pump. When i give power to the pump it start & goes off immediately and it's repeating like that till i plug it off. Adaptors LED is also ...
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2answers
63 views

Can I safely substitute a DC converter for the Macbook's AC adapter?

I want to go from this: to this: The converter would be this: http://smile.amazon.com/dp/B00HVCWGNE or something like it. Does this sound safe? The step up converter would be set to a specific ...
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4answers
500 views

Why and How does Power Plant generate Watts?

I know my question is stupid, it is stupid because I am not understanding it correctly. I thought two of following is required to calculate watts. Voltage, Current or Resistance/(Impedance in AC) is ...
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2answers
64 views

Soft start… for a transformer

so I have a transformer (3kva 120vac -> 240vac) that runs great but blows the breaker occasionally on startup. So I'd like to add a soft start. This is an industrial control environment so I could ...
2
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2answers
42 views

Solving for the impedance and phase shift in a series-parallel AC RCL Circuit with Complex Numbers

Having a lot of trouble working through an AC circuit, asking for some help. The circuit is relatively simple - I have a capacitor of capacitance \$C\$ and resistor of resistance \$R\$ hooked in ...
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0answers
23 views

Type M AC Adapter Pins -Identification Help

Below is the picture from a Belkin Wemo wireless switch teardown for the side that plugs into the wall outlet. The complete teardown is here They have mounted the AC pluggable pins directly on the ...
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3answers
106 views

How to automatically switch to backup power? [closed]

To solve the frequent power outages that happen where I live I ended up using a spare car battery I had and a power inverter (one of these). With that I have more that an hour of backup power so it's ...
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0answers
116 views

AC fan speed control (using Arduino)

I wanted to control a 220V, 50Hz AC ceiling FAN using PWM output from an Arduino microcontroller and I have referred to several resources regarding this. Resources I referred ...
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1answer
55 views

Measure inductor coil's resistance using multimeter

simulate this circuit – Schematic created using CircuitLab Above is the set-up of my simple experiment to determine the inductance of an inductor. The voltage across resistor R (5 ohms) ...
2
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2answers
76 views

Is it possible to change the speed of an AC motor(drill press) without losing too much torque?

I have a drill press as in the image below, it runs from 110V AC 60Hz and has internal belt reduction. Unfortunately however for some materials and hole widths, I need it to go even slower than It's ...
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2answers
35 views

Calculate rotor slip without knowing synchronous speed

I am given the rated values of a squirrel cage induction motor: A 300hp, 2300V, 3‐phase, 60Hz squirrel‐cage induction motor turns at a full‐load speed of 590r/min. What is the approximate value ...
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1answer
49 views

Live wire , neutral wire confusion

I read that current enters an appliance through live wire and leaves through the neutral wire.Consider the appliance to be a light bulb.Now my question: 1.Shouldn't the current first travel to the ...
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0answers
121 views

By touching neutral why we do not get shock?

According to Benjamin Franklin, current flow from +ve to -ve terminal. But after Joseph Thomson's discovery it was conceived that although current flows from +ve to -ve electrons flow from -ve to +ve ...
2
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2answers
64 views

33V residual AC voltage in domestic circuit when switched off? Neutral switching?

I have searched Google, but get bombarded with "RCD" type answers. I read a few answers here that may have been relevant but turned out not to be, so I post my question. Being my first, I may ...
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1answer
65 views

How can a remote-controlled (wall) light switch operate without a power source?

A few days ago, i bought this remote-conrolled light switch. When installing it, i wondered why i had only two lines to connect (the one going to AC power and the one to the lamp); i thought i needed ...
0
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2answers
129 views

Can we short the neutral to earth (ground) at entry point of our home electrical supply?

Normally in our 230V power outlet, the voltages are as given below. Neutral to Earth - Less than 2V Neutral to Phase - 200V to 230V Earth to Phase - 200V to 230V But nowadays, after around 10 am, ...
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1answer
26 views

Write V_final in terms of V1

simulate this circuit – Schematic created using CircuitLab Being \$V_1=10\sin(100t)\$ and \$V_D=0.7\$V, it is asked to find the output potential as a function of \$V_1\$. I made: ...
0
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1answer
57 views

How is low starting torque of asynchronous AC motors addressed when driving elevators?

Long before variable frequency drives became popular elevators were often driven by dual-speed asynchronous AC motors. Switching speeds was done by changing the number of poles (which is done by ...
0
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1answer
95 views

Water conductivity measurement AC, interfacing with arduino

I want to implementate this device, mentioned in the title. The problem is how to correctly build the " read out device" that is clearly a wheatsone bridge? But in AC, the problem is the signal ...
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0answers
34 views

modeling AC resistance proximity and skin effect using LTSPICE

I'm designing an air-core loop receiving antenna from <1Hz - 50kHz. Is there a way to approximately model the skin/proximity effect using lumped circuit parameters in SPICE software? I think you ...
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1answer
30 views

AC voltage source - variable load

I'm looking for some kind of idea for controlled load for AC source testing. The output signal of source is a bipolar sine wave 5 Vpk (so it varies from -5V to 5V) and it has 1.5kOhm series ...
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0answers
19 views

Where can I find the ac voltage in this diagram in LTSPICE software?

Where can I find the ac voltage in this diagram in LTSPICE software? Secondly, which settings in this software do I have to make to get alternating INPUT voltage just like in the diagram? What ...
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0answers
58 views

different voltage input on a transformer used as output

I have a transformer which I Take from my bridgeport milling machine panel box,I am thinking to make a phase converter and need 380v from my 220v single phase supply. this is the diagram of the ...
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1answer
77 views

What happened to my second half cycle of my half wave rectifier?

When I'm doing a simple half-wave rectifier with the set-up as shown above (Note: Diode D2 is not connected) and connected terminal 5 and 4 with positive and negative terminal of oscilloscope, this ...