Questions tagged [electrical]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
1answer
198 views

Is this dimmer compatible a DC 12v power supply? [duplicate]

This power supply is used for LED strip lights I recently purchased. I want to know if the dimmer below can be used with the power supply. The PS is AC 100-240v (IN) to DC 12v (OUT), while the dimmer ...
-4
votes
1answer
62 views

Input voltage drop [closed]

I have a circuit, the characteristic of the load is unknown, most probably resistance and capacitance, the input for the circuit is %v and frequency is varying from 10 Hz to 30 MHz. once the input ...
1
vote
1answer
55 views

Creating a small range, small baseline varying resistor

I am doing a design project on making a passive varying resistor device. I have a flex sensor that increases in resistance when you bend it. It has a 10k ohm nominal resistance and increase to 110k ...
0
votes
1answer
41 views

Skin effect and mag field distribution inside an electric conductor

Magnetic field inside a current carrying conductor Suppose I took a circular current strip in a current carrying wire. At the centre I have marked the directions of magnetic field due to four points 1,...
1
vote
2answers
166 views

I need a power source for my DBD (Dielectric Barrier Discharge) [closed]

I need to make a circuit which gives me ac voltage in the range of 5-20 kV and frequency above 1 khz. The ac voltage which my lab gets is 50 hz 240 v. I need to somehow step up the voltage and ...
0
votes
1answer
99 views

Can Inductor force abrupt current change through another inductor?

Say the 3H branch of the circuit was connected to the 1V source for a long time such that 500mA current is flowing through the 3H inductor. Then after long time the switch was connected to 1H ...
2
votes
3answers
1k views

Safe use of Coiled Cable [duplicate]

So we have this machine at work, a strapping machine, and it has a long power lead which is left loose on the ground, and it's getting gradually destroyed - accident waiting to happen. I know that ...
-1
votes
1answer
252 views

Is this 230v Relay circuit design good enough? [closed]

I’m designing and building a small pcb circuit and have come to the stage where it is almost done. But since this is my first time I would like some feedback before I actually order it, maybe some ...
0
votes
1answer
36 views

Electrical Charisteristics of PIC24FJ1024GB610

I am reading the Electrical characteristics of PIC24FJ1024GB610 from it's Datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/30010074e.pdf (Page 419/468). it mentions: Maximum output ...
0
votes
2answers
113 views

Is there a requirement for Electrical Design Engineers to show all his/her design computation/analysis used on electrical plan?

There was a Terms of Reference requiring to provide 100% back-up Power on all residential units of a building. However, I noticed that the design-in-charge do not include provisional loads on his/her ...
2
votes
4answers
1k views

Voltage Drop Calculation (AC)

Hope someone can help me out and point me the right direction to solving this. I am trying to do a voltage drop calculation to see the VD % for the cable selected. The following are the values, ...
0
votes
1answer
493 views

What kind of motor is used in electric room heater?

I did enough surfing to know about the kind of motors used in electric room heater, but not able to finalize. The principle seems like working of an induction motor with a electromagnetic stator but ...
0
votes
2answers
89 views

Current flow from a charged capacitor [closed]

How does the electric field inside a charged capacitor force the electrons in a conductor to flow and establish electricity?
-1
votes
1answer
192 views

I don't quite understand how voltage and current work. Please help [closed]

So I've been reading a book about electrical engineering and I still don't understand this: In a series circuit, the current stays the same, right? But when there is a resistor, it resists the current ...
0
votes
2answers
188 views

Balanced star 3ph system

I have balanced star three phase generator 380V with junction point is connected to ground And current through from junction point to ground is I0=0 for that clearly say it is balanced system when i ...
0
votes
2answers
189 views

Inverter Surge Capacity -Technique Behind it

An inverter's surge capacity indicates how it handles short-term overload before "tripping". Surge capacity is essential to start up some large loads, especially motors that need 2-3 times their ...
0
votes
1answer
60 views

What is an electrical relay on a bus (vehicle) made of?

I was driving a bus and had the heaters and defroster on high. But this turned out to be too much amperage for this old bus -- an electrical relay caught fire and smoke was billowing into the bus. ...
0
votes
1answer
2k views

BLDC Calculation for Back EMF

I have a brushless DC Motor that i am considering buying from hobbyking.com with 2100Kv (RPM/v) i am trying to follow the equation on Wikipedia's motor constants page i have included the equation here ...
1
vote
1answer
40 views

2 wire to 3 wire system for ZWave

I’m looking at installing a zwave system in the UK. The relays I want use require a 3 wire system. They say most of the uk is wired via a 2 wire system This is the product http://www.vesternet.com/z-...
0
votes
1answer
40 views

How does a voltage controller specifically L7805CV work ( detailed )? [duplicate]

I have used this vc in a project but for the file I'm not able to find any info on how this thing works like how and which transistors are in it. Anyone knowing anything about it please share. Thank ...
0
votes
1answer
47 views

Mixer Audio output xlr small contact with pin power suply of guitar pedals , possible damages?

Last night after a gig my audio Mixer output cables has had a small contact with the pin of the power supply of my guitar pedals that was on electricity. The mixer was not on electricity but the VU ...
1
vote
1answer
92 views

Why the shape of rotor-poles of salient pole synchronous machines are designed as sinusoidal in shape?

I knew that this is done to eliminate harmonics. But I couldn't get its reason. So I am confused whether my conclusion was right or wrong.
0
votes
0answers
336 views

Electrical Machine Design: Why do open slots are allowed in synchronous machine while they are avoided in Inductio Machine

Why do open slots are allowed in stator and rotor of synchronous machine while they are avoided in stator of Induction Machine? Because flux from stator to rotor (IM) and from rotor to stator (in SM ...
0
votes
2answers
157 views

Can a capacitor prevent over-amperage of lithium ion batteries?

I have an electric motorcycle I've built, I have 7 Nissan Leaf battery packs in series to make 48v nominal. Unfortunately, after a month of enjoying the acceleration a bit too much, the batteries no ...
0
votes
1answer
51 views

LCD goes off for a moment [closed]

I have usually noticed that when ceiling fan of room is turned on, the screen of monitor or LCD goes black for a moment. Why is it? and It resumes from the same point i.e only monitor goes off and ...
0
votes
1answer
532 views

Can anyone please help me with this ETAP Project?

I'm trying to run the load flow study, but instead I'm getting this error. Error 101-01: [Bus 2] Bus base kV is out of 40% range from bus nominal kV. Error 722: [XFMR 1] 2W transformer secondary kV ...
2
votes
1answer
68 views

How would you design an electromagnet for maximum force when you have a fixed power available?

There are number of variables like current, wire dia, number of turns, dia and length of electromagnet. The distance at which force is applied is constant The distance is nearly 12 inches. Power is ...
1
vote
1answer
158 views

Electrical Engineering Prelab - Absolute value of gate voltage

A. In the circuit in the figure, the thermistor resistance is 50 kΩ. What is the absolute value of the gate voltage (voltage at node G) versus ground? B. How does your result change if the thermistor ...
-2
votes
1answer
103 views

What is this yellow circled component?

I'm designing a circuit for lightning detection. I want to know what is this component. CNT1
0
votes
1answer
398 views

varistor curve and voltage meaning

Could I get an explanation for these datasheet definitions for a varistor? 1) Max. applied voltage. 2) Min varistor peak volts. 3) Max varistor peak volts. 4) The clamping voltage is known to be ...
-2
votes
1answer
143 views

Does somebody know about this tool?

I'm very proud to be a part of this community. I'll be very thankful,if somebody does recongnize this simulation tool? (Please see image) Thank you very much for your help.
-2
votes
1answer
100 views

Electrical commutator for a coffee machine [closed]

i would like to understand the role of the commutator in the following diagram. NB: abbreviations: Co: commutator Re:heating element Pr: pressure switch Sa: heating element protection Ct: power ...
1
vote
1answer
35 views

Can I use per unit method for true, reactive, and apparent Power

I would like to show apparent power (S) in Cartesian coordinate system with a circle of radius 1, where x axis represents reactive power (Q), and y axis represents true power (P). There's the formula: ...
0
votes
2answers
136 views

What is Waveform of current in rl series AC circuit when operated for first time i.e. from time t =0?

(https://i.stack.imgur.com/fpWP4.jpg) What is Waveform of current in rl series AC circuit when operated for first time i.e. from time t =0? Is it 0 from 0 to 90 degree
1
vote
2answers
198 views

how to calculate resistors' value?

I'm new to electronic circuit, I'm solving some problems in the book and come across this one, but I cannot calculate the value of Rs and Rp according to the info provided. Can someone help me with ...
2
votes
1answer
153 views

Transformer rectifier set. A question about the schematic diagram

This is a high voltage transformer (53kV) and rectifier that is used to power an Electrostatic Precipitator. The schematic shows a jumper between terminals H1 and H2 with a label "Remove jumper for ...
0
votes
1answer
381 views

How to wire this transformer? I am not clear on what these wire colors mean and where they go

I read several color coding guides but I am not sure which wire goes where... My guess is that the black is the L wire, which stands for Live, and the white wire is the N, which stands for Neutral, ...
-6
votes
2answers
798 views

Using Wi-Fi during lightning [closed]

Is it safe to use Wifi during lightning or a thunderstorm ? How may I get electrocuted?
-9
votes
1answer
164 views

Curiosity in digital electronics [closed]

Do computers really understand binary language and if yes how?? ( I guess no because they don't have brain to do such tasks.)
4
votes
2answers
391 views

Calculating total torque of stepper motor to lift and rotate some weight

I am going to design a system that would be control remotely. The system consist of stepper motor and solid cylinder rod of about 30 inches long and needs to lift about 0.5 lb/0.223 kg mean up to 90\$^...
0
votes
0answers
457 views

Why is the chording angle 30 degrees, in a practical alternator?

So far what i have understood... Chording angle in Synchronous Generator/ Alternator is introduced to tackle the problem of harmonics that couldn't be taken care of during the design either in - ...
-3
votes
2answers
92 views

Diode and resistance electronic

Can you tell me what is different between two circuit: One AC source and resistance in series second AC source, diode and resistance in series either: Can you show the difference in equations? ...
1
vote
1answer
416 views

Calculating resistance for metal layer from LEF File

I have a .LEF File which has various metals description and their parasitics information. I am trying to calculate R. It is specified as RPERSQ = 0.278. In the File description it is written as ...
1
vote
1answer
110 views

Basic electric/wiring questions resources

I have a 12V DC motor that I want to power alongside a 40 Watt incandescent bulb (I might find an LED bulb that works aesthetically).  I need to run a single cord to power both.  Preferably with a ...
0
votes
2answers
65 views

DC distribution

My question is this that I am confused about the fact that we are feeding 220 V voltage from both ends of a distributor and then we are restricting that the maximum voltage should not exceed 6V what ...
0
votes
2answers
82 views

Current drain into wall at home

I checked the wall near a plug with a Non Contact Voltage tester, and it showed electricity is present in a 3 meter diameter from the plug, on the wall. I think the wire inside has some contact with ...
0
votes
2answers
2k views

AC RMS and DC average voltage

Imagine we're trying to get 120V output. For AC, we must have a source with a peak voltage of 169.7V to achieve an RMS voltage of 120Vac. (169.7V * 0.707). For pulsating DC, whether rectified by a ...
0
votes
3answers
74 views

Why are we substract V(BE) in Emitter Biased Configuration?

Guys I am working on electronics devices been a while but everything gets more complicated.I am confused.I can easily solve questions but I could not understand the main idea when we are writing the ...
0
votes
1answer
920 views

Can we use 125VAC 20A switch in place of 12VDC 20A switch?

Can we use 125VAC 20A switch in place of 12VDC 20A switch? I have searched my local market and found 125VAC 20A switch. Can i use this AC switch in place of 12V 20A switch as it is not available in ...
0
votes
3answers
132 views

name of one part in electrical cables

There is an extra plastic or wrapper piece at the end of the electrical cables. I asked one of my friends about it and he said its for insulation purposes but he does not know the technical name of it....