Questions tagged [electrical]

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25 views

Can anyone explain how to solve this circuit for V and I at the given locations? [closed]

I was given this circuit and need to solve it for the current and the voltage at the indicated locations. Can anyone explain the method to do this?
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1answer
409 views

Whats a N (+,N,-) terminal on battery connection to UPS?

We have a 3 phase ABB powerline series in our site, and we are installing it. In connecting external batteries to the UPS, 4 terminals are given +,N,- and PE. I understand +,- and PE, but for what "N"...
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2answers
230 views

Best way to power 120 VAC fog machine with DC?

OLD: I have a 120 VAC 400 W fog machine. I want to mount this on a robot that can supply 12 volts. Can I just reuse a $10 car inverter from Amazon or is there a better way to do this? UPDATE: So I ...
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2answers
38 views

Calculation of Relay current

I am using Relay OJE series SPST and I want to drive the relay with V=5v and the resistance through the coil is 125 ohm. From microcontroller 3.3v and 1k resistor. The NPN type is BC817-25 and the max ...
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1answer
171 views

Synchronous Motor Power and Frequency Relationships

I'm having a difficult time trying to understand what effect the frequency of a power supply has on the power of a synchronous motor. For example, if the supply frequency were to increase from 50Hz ...
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1answer
32 views

Confusing regarding sub domains of main specializations EE?

I want to apply for masters program in Hungary in EE As shown attached snapshot, there are listed 3 secondary specializations: Smart city Smart systems integration Optical Communication I know ...
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1answer
191 views

Why does a turbine with PMSG and full converter system draws reactive power when turbine is stopped or there is no wind?

Our turbine has a permanent magnet synchronous generator and full converter system (rectifier diods for rectification and IGBTs for chopping dc link voltage and as inverters) which means its generator ...
2
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1answer
82 views

Does cutting the covering of subwoofer wire affect the sound quality?

I have Sony 5.1 channel sound system. There is some cut on covering of subwoofer wire. The copper wire is not affected at all. So, I am curious to know whether it will leak the passage of sound and ...
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2answers
128 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 ...
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2answers
2k views

Are there gate-level ways to produce the min or max of two binary values?

Some basics of digital logic are the half-adder and full-adder. We know how to produce the sum of two binary values at the level of AND/OR/NOT gates, in a straightforward way presented in many ...
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1answer
62 views

Crock pot on power inverter

I have a slow cooker crock pot thats uses 120 volts AC which range from 0.6 amps to 2 amps and consume electricity that ranges from 70 watts (low temperature) to 250 watts (high temperature). When I ...
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0answers
30 views

UPS vs Surge Protector regarding short circuits and quality of power

I did research before posting and it seems a UPS filters power so that it is constant and “filtered” additionally it seems to be able to protect against short circuits. Does a surge protector have ...
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0answers
46 views

Design of a 5kW residential Solar system with battery- need help with electrcial diagram

A design project asks for a design proposal of 5kW solar panel with inverter and battery system for a residential house. I have completed the energy estimation, panel size, orientation, and selected ...
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2answers
114 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
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0answers
23 views

Battery Charge and Discharge Time Calculations

I am performing some calculations but struck with confusion whether I am doing it correct or wrong due to contradictions of these calculations on different calculators websites. I hope here someone ...
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38 views

Syntax error in VHDL Code 1 error

I am getting 1 error that states "Keyword 'is' expected" and I cant figure out what it means. Can anyone help?
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1answer
69 views

Distance and voltage/watt loss?

I have read multiple posts on here regarding voltage/watt loss but I wanted to see how it would apply in this situation that I can not seem to solve using available resources. Maybe I just do not ...
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1answer
55 views

Can I change the battery connector on this model aircraft safely?

I am working on a project, and am required to build an autonomous glider (no propulsion). Weight is limited to 9oz, and we are using the Pixhawk 4 mini for flight controls. The power management board ...
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1answer
42 views

How do you wire a Marx Generator?

I have seen videos of people actually being able to power on a Marx generator with no problems whatsoever but however they never show the complete setup and diagram of their circuit and real physical ...
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1answer
58 views

First design with EEPROM

I want to get an idea of how to use a chip, code it and burn it. So an and gate could be a good choice. I've thought about using AT27C01024-70PU or AT89LP4052-20PU. Got this burner in mind: https://...
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1answer
35 views

Noise in transmission system

Does external noise (not electrical noise) affect system voltage? If so how does a source of sound energy distort a voltage waveform? https://youtu.be/4TCnYYpZxEc What exactly is happening in this ...
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1answer
35 views

Solar Module Voltage when bypass diode activate?

What happen to the voltage level when a solar module is shaded and one of its bypass diode is activated? Assuming this solar module has 3 bypass diodes. I have been reading and can't seem to ...
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4answers
71 views

How does energy dissipates in a purely reactive circuit?

Suppose in a home, power factor drops to zero. It means that the circuit becomes purely inductive. If the energy meter is connected at incoming power supply point,will the energy meter still keep on ...
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2answers
370 views

How do designers know about kilowatt power of wind turbine generators like 1.5 MW?

Generators and transformers are always designed in kVA because designers never know about the load it will provide power to. Then how do we know the wind turbine generator will deliver 1500 kW or 2 MW ...
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1answer
35 views

How to prevent circuit from shutting down when motor drain too much power

I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
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1answer
127 views

Will resistance of wire increase with age due to some effects?

Today I had an electrical problem at my home not yet resolved. I will explain the problem. The switch for water motor and switch for lamp are nearby in same board. When I turn ON the lamp switch, the ...
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1answer
121 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 ...
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2answers
132 views

How do I connect an LED with floating DC voltage?

I want to connected an LED at the output of 500V DC. This DC power supply is made by 3phase DC rectifier and is floating. I would like to have a display on the front panel of the supply which will ...
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1answer
37 views

Graph theory for Networks

To use the formula, [Bf][Zb][Bf'][I] = [Bf][Zb][Is] - [Bf][Vs] for the concerned, or any tree, should [Vs] and [Is], be written with respect to the directed tree I've taken, or with respect to the ...
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1answer
57 views

Oscillator connection

I have two questions here for how to connect the oscillator to a microcontroller (SPC584b): How can I determine the values of the capacitors? What is the need of SB2 & SB3?
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0answers
37 views

Can we use the Halbach array configuration in an electromagnet?

I tried asking this question in several forums but didn't find any answers as i expected. It's very hard to find information about halbach array in google, especially in the electromagnetic field. We ...
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0answers
74 views

Can a circuit have capacitors in both series and parallel?

From my understanding, two capacitors (or any electrical elements) are in series if the same current goes through them. Two capacitors are in parallel if they are connected to the same wires on both ...
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1answer
242 views

Digital compatibility of logic gates

I started an applied electronics course at my university and my teacher assigned us this assignment after a lecture on how to check the compatibility of two or more gates: Output electrical ...
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0answers
30 views

Superposition analysis with VCCS

I have just started doing electrical engineering course in the university. And I really don't understand how to treat those dependent sources when doing the superposition analysis of the circuit. Here ...
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58 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
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2answers
47 views

Does ideal Transformer transfer DC input voltage to secondary side, under NO-Load and Loaded condition?

Does ideal Transformer transfer DC input voltage to the secondary side, under NO-Load and Loaded condition? please you take DC input for a long time. Also consider two more conditions, 1st: for ...
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1answer
47 views

whats voltage drop on 40 yards of ws2815 leds

We are working on a project of using ws2815 led strips and our concern is how to handle the voltage drop?
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3answers
103 views

Is the electric current delayed

simulate this circuit – Schematic created using CircuitLab -Suppose that the distance between "D1" and "D2" is too large. -Does "D2" give a delayed response compared to "D1"?
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3answers
246 views

Dependent voltage/current sources

I'm so sorry for that questions, but we need to understand what's going on behind the concept/theoretical of using device "dependent voltage/current source"! My question: Yes, we are using dependent ...
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1answer
145 views

splitting sensor signal line

Is it possible in circuit design to split like say a temperature sensor line reading into 2 wires, and read by 2 different system/circuitry? My motive is to tap the signal line in a safe way without ...
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0answers
66 views

What is the off-white powdery material found at the base of GU5.3 light bulbs?

I've noticed most GU5.3 light bulbs, both halogen and LED, contain a granular material at the base. There seems to be considerable variation in how much of this powder is present, even within the ...
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0answers
24 views

Assistance with getting VM3558T motor running

Good afternoon, I've spent quite a while trying to figure out this problem but this field is not my expertise. I'm trying to build an ABS plastic shredding machine for recycling - I've got ...
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1answer
105 views

Torque in a 3-phase delta connected induction motor

I know the equation for torque is T=[m*(N2/N1)^2/2*pi*Ns]*[s*E1^2*R2/R2^2+(s*X2)^2] N2/N1 is the effecting rotor-stator turns ratio. I have it written ...
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1answer
52 views

Flash in MCCB when switched off

Recently I switched off several molded case circuit breaker (MCCB) and saw a flash at the back of the breaker for an instant. This happened to all the MCCB on-site (around 14). The MCCB are all rated ...
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2answers
41 views

Total Dissipated Power

Please help look into to the below question where total dissipated power is to be calculated. In the solution given in the text they have added the under root of the power and then squared the result. ...
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1answer
151 views

What symbol is this?

Does anyone know what this step between the two lines mean?
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0answers
33 views

Difference between magnetizing inductance and primary inductance

What is difference between magnetising inductance(Lm) and primary inductance(Lp) of transformer?
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2answers
118 views

Multiplication of average voltage and current?

Multiplication of \$V_{rms}\$ and \$I_{rms}\$ gives average power. What things we get if we multiply \$V_{avg}\$ and \$I_{avg}\$??
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1answer
60 views

Please help guide if my understanding is correct

Please help check if my understanding is correct for the above circuits. As per my understanding the Voc=4v, since we have opened the circuit and there is no current flow. If that was not the case we ...
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1answer
27 views

AC Load Detection with auxiliary power supply

Is it possible to detect a load in an a.c. circuit before switching the main power supply supply on? Perhaps by using an auxiliary circuit which has it's own power supply, like a multimeter?