Questions tagged [ac]

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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1answer
71 views

AC circuit voltages and currents

I have this circuit: Have I done everything correctly? I cannot find my mistake. Help appreciated.
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2answers
51 views

AC circuit capacitor voltage drop

Suppose we have this circuit: simulate this circuit – Schematic created using CircuitLab Z = 4-3j I = V/Z = 1<0/5<36 = 0.2< -36 A But when I use Ohm's law on the capacitor i get this ...
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0answers
73 views

Does this voltage logic make sense? [closed]

In India, stabilizers have to be used for ACs. At least that's what people say because voltage fluctuation is common here. I'm buying this Air Conditioner and was thinking about to buy this Voltage ...
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3answers
96 views

Where do you put the inverter? Near the battery or near the load?

Where do you put the inverter to minimize power loss on a stand alone solar setup? I'm using DC 12V as power on devices but I notice resistance on wires when running long lengths. AC is better on long ...
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0answers
44 views

Could i use an AC Arc welder as a Dimmer [closed]

i am trying to slow down my electric jigsaw a little bit. Since it needs a lower voltage in order to achieve that i came up with the idea of using an old and heavy arc welder, which only consists of a ...
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1answer
46 views

How to connect single-phase power source to 3-phase motor

My 3-phase, wye wound, 9-lead motor has: wires 1 & 7 connected to wire L1 2 & 8 connected to L2 3 & 9 connected to L3 and 4, 5, 6 wired together. I put a plug on one end of a cable, that ...
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3answers
74 views

does hot and neutral wire produce less heat in a single conduit than in two separate conduits?

an electrician is telling me that having the 2 conductors (hot and neutral) for a branch circuit from my home Electrical Panel in the same buried conduit will produce less heat because the 2 magnetic ...
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3answers
317 views

What is the impedance for this parallel rl circuit?

I want your feedback on my approach to solving the question. I also want clarification on the phase angle for the inductive reactance.
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4answers
740 views

Definition of RLC resonance frequency

I have found that a commonly mentioned definition for the resonance frequency in an RLC circuit is defined as the condition where the capacitive and inductive reactances cancel each other, resulting ...
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1answer
60 views

Input and Output Voltage of a Full bridge rectifier

I know If we provide a sinusoidal AC Voltage across the Inputs of a full bridge rectifier we get a fluctuating DC Voltage (more or less) with the peaks of source AC Voltage. But what would be the peak ...
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1answer
27 views

How to stabilize and add additional power to an existent line?

My first question on this Exchange so I hope this is the right place for it. Currently, I have a quite unstable power supply in my workshop, coming from a very old electrical installation. It is a ...
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1answer
48 views

Easiest way to (quietly) drive a 2W 120VAC load (piezo air pump) from MCU-controlled 3V/5V/12V?

I'm trying to drive this piezoelectric air pump that requires 1.5W and runs on 120VAC 60Hz wall power. This will be controlled by a MCU/CPU of some kind (Raspberry Pi in this instance), so the control ...
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1answer
40 views

Phototriac for low voltage AC motor control without external triac

I have a circuit that does not work as expected. It uses a MOC3023 phototriac to directly control a 12V AC pump. Since the motor is very low power I assumed I wouldn't need an external triac. This may ...
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3answers
64 views

Voltage and current during the first cycle of RL circuit

I have a simulation of RL circuit connected with an ac source. Any one can tell me please that why the peak of the current during the first positive half cycle is higher than the peak of current ...
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1answer
90 views

Danger of inserting knitting needles into an electrical outlet

When I was a little kid (read: inexperienced), a friend of mine claimed (as his mother warned him) that putting metallic things into an electrical outlet is dangerous. Kids are curious. In order to ...
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1answer
47 views

Power adapter 13.5V vs 15V

I'm trying to troubleshoot a problem with my Creative Inspire T6100 speakers. They seem to be known for volume control issues. In any case, I'm trying to determine if the power adapter is working as ...
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1answer
48 views

UV-C lamps flickering problem

I have got 8 UV-C lamps connected to a portable battery(AC) through a smartplug. I am using 4 UV Ballast with 2 lamps connected to one ballast. I am controlling the lamps with help of a wireless ...
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4answers
98 views

Transients in series RL circuit with AC source

Why the transient current will die off in series RL circuit with AC source ? Every time the ac voltage source reverses direction so does the current and the current has to pass through the same ...
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1answer
27 views

Using a dual winding transformer to provide dual winding AC and DC of a single winding

Ok, this feels like a stupid question, but my google-fu is not with me today. I have an application in which I have a need for both 12V DC (or thereabout) and 24V AC. I have a transformer that has two ...
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0answers
34 views

Safest / preferred ordering of AC terminal block terminals?

I'm building an enclosure for a switching device that has 5 outputs: Ground (G), two AC neutrals (N), 120 VAC hot (H), switched 120 VAC hot (HS), up to 12 amps per H/N pair but no more than 15 amps ...
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1answer
34 views

Voltage gain, input/output impedance using multisim.. How? [closed]

This is the picture of my amplifier circuit using multisim... But I'm not very familiar with this software and thus... how do I do the AC analysis to get the voltage gain, input/output impedance...?
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1answer
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Wiring 240 V single-phase AC induction motor to enable operation forward and reverse on a 2-post ramp pulley system

I installed a single phase motor on a car ramp. I need the motor to operate forward and reverse, so the ramp goes up or down. I understand this is possible with the use of two contactors. I need the ...
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1answer
83 views

How can I reduce 120 VAC 60 Hz gradually to zero in a 8 seconds?

Need help on a project where after a pressing a button 120 VAC voltage drops gradually to 0V in 8 seconds. Second button will restore full voltage again. Load is a big magnet and its current can be as ...
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5answers
473 views

Reactive power in AC circuit

What is meant by reactive power in AC circuits? Power is joules per second. Real power is the energy dissipated in the resistor per second. What is meant by the reactive power? Does this mean the ...
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2answers
50 views

Phase shift in AC Circuit power calculation

I have the below question. I am not trying to ask the answer for the problem. But my question is that, we can see that 60deg is the phase shift. But both the voltage and current across the passive ...
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2answers
49 views

Connect motor in 220 VAC single phase (Line - Neutral) or in 110VAC two phases (110VAC - 110VAC “180 degree out of phase”)?

I need to connect A motor of 220VAC to single phase connection :Line - Neutral(220VAC - Neutral). In my country that doesn't exist so in my country we have this : L1-L2-neutral (110VAC - 110VAC "...
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1answer
86 views

Converting from time domain to phasor domain?

If I have a voltage source of a circuit \$V_s(t) = 8\cos(24\pi*10^9t-60^{\circ})\$ (V) and I want to convert it to the phasor domain would it be this? \$8e^{-j60^{\circ}}\$?
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3answers
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Transformer power supplies, which one would have a 24VAC secondary when the DC output is 9vdc > 12vdc > 15vdc > 32vdc

I need 24VAC 300ma for a solenoid and have these old transformer power packs with outputs of: 9vdc, 12vdc, 15vdc, 32vdc. I'm willing to crack open one and use the transformer but I only want to open ...
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2answers
63 views

Theory: Can power cables induce AC voltage in human body?

In a demo video (which I unfortunately can't share) a man makes the following setup: Multimeter on 200 V AC settings with one pin in the ground socket of a conventional mains power socket. Right ...
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2answers
1k views

How to remove huge spikes in current

I am making an DC to AC converter circuit in LTSpice. The schematic is posted below. When I plot the current across the transistors, I get huge spikes in the current, as seen in the diagrams below. ...
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1answer
66 views

How to design a square wave inverter circuit without an op amp

I am using an NE555 timer circuit to generate a 0 to 12 volt 10kHz square wave. I would like to invert that square wave (so inverted signal is 0 when original is 12V and 12V when the original is 0 V.) ...
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4answers
123 views

How can capacitors pass AC without or with minimal voltage passing?

My question is: How can capacitors pass AC without or with minimal voltage passing? If the current is caused by a voltage (potential) difference and current is just the voltage (or charge) passing per ...
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1answer
44 views

Harmonics produced by LCC converters

Considering an LCC HVDC system and that the flow of power is ALWAYS in the direction shown in the figure. I know that converters in general produce harmonics. My questions are: Does this HVDC system ...
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3answers
50 views

Single capacitor for Powerline communication - AC coupling

First of all: I am not talking about traditional powerline communication (ethernet protocol etc) but about a very simple and primitive communication, like serial data transmission (https://en....
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3answers
51 views

Do switches induce voltage spikes in the AC power grid?

I know that DC inductive loads create back EMF when turned off and that's why we use a freewheeling diode. Does this also true for AC inductive loads and AC loads in general? I know we can't use a ...
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4answers
451 views

How are the -3dB point and the pole of an op-amp related?

I have been looking at AC frequency responses for op-amps and I was wondering how an op-amp's pole and the frequency at the -3dB point are the same? They both mark the location where the gain starts ...
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2answers
55 views

Is this LDR and TRIAC circuit advisable for real time application?

Would you suggest below circuit? Will it work for a long time? What are the advantage and disadvantages of this circuit? https://envirementalb.com/automatic-street-light-circuit/
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1answer
99 views

Why do some motors have both 50Hz and 60Hz on their nameplate, and some do not?

I have seen some induction motors have information on their nameplate listed for 50hz and 60hz. While I've read a requirement that the Voltage/Frequency ratio be consistent, using these nameplate ...
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7answers
1k views

Why do single transistor oscillators work to power a transformer, if a transformer needs AC?

I have been making some high voltage projects lately, such as a spark gap Tesla coil, slayer exciter, and a flyback transformer HV supply. The flyback transformer uses a single transistor circuit, ...
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9answers
5k views

Is this an AC or DC signal?

My teacher says that this signal is DC, but if the polarity varies from 0V to -8V , shouldn't it be AC? He says that DC + AC = DC
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1answer
68 views

AC vs DC refrigerator [closed]

I’m looking to purchase a refrigerator for my van. I plan to have an inverter installed and a battery bank. AC refrigerators are much cheaper than DC so I prefer to go that route if possible. The ...
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1answer
26 views

Rated voltages for the Cage clamp connectors?

what does the rated voltage for a connector means? How should we select the connector for a 230V AC application? Let us say can I use this connector for my 230V AV application? https://www....
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1answer
40 views

Inverter dc to ac

I want to controll electronics made for AC with DC. In the specs it says 60 volt AC and 5W. Is it possible to use an inverter for translating 60 vdc to 60 vac? Or how can I calculate this? My idea is ...
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3answers
88 views

Please clarify something about electrical transformers

Please have a look at the following picture and tell me what I am not seeing properly. This is a core type transformer. However, I don't quite understand "One-half low voltage winding and one-...
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2answers
60 views

Use a AC plugged device with a battery [closed]

I have an electronic drumkit, which is plugged to the AC plug. I want to put it in a room without any access to the AC grid, and I would want to use batteries instead. The device is called Roland Td15,...
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2answers
36 views

Time varying voltages [closed]

Hi I am in an introductory circuit analysis course and we just got to the portion over time varying voltages and currents through inductors and capacitors. We aren’t on the alternating current section ...
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0answers
53 views

AC signal gets unwanted DC offset when connected to circuit

Hi im a 4th year ELE student and I am creating a circuit which outputs 120khz square wave burst when it detects zero crossings from the input ac signal. Here is the circuit diagram Op amp 1 converts ...
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4answers
171 views

How to combine wall outlets for higher amperage?

I have a large single phase AC motor that draws 30 amps at 125v. I only have access to NEMA 5-15R outlets (which are rated for 15 amps). However, several outlets are on different lines (different ...
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2answers
73 views

Is AC coming from a DC powersupply normal?

I recently bought a Oubel Laboratory Power Supply 60V/5A, that I'd like to use for hardware diagnosis. When measuring the - and + outlets, the oscilloscope picks up ac voltage, that propagates through ...
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2answers
78 views

What does an AC signal look like when it is grounded with a DC signal?

Sorry if something doesn't make sense, I am not an electronic engineer, if I need to clarify something, please tell me to :) I am upgrading the light on my motorcycle to an LED light. My problem is ...

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