Questions tagged [electrical]

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2
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1answer
92 views

Is this a good design for a 0…7 counter?

My daughter's electronics teacher recommends to realize a counter from 0...7 as follows: It shall give an output pulse (for a subsequent circuit) when the button is hit the 8-th time. For me this ...
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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
38 views

Switchgear dielectric testing and impulse polarity

What is difference between negative and positive polarity impulse test? Why Negative only done for internal dielectric strength and positive polarity impulse only for external dielectric strength? ...
2
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1answer
280 views

VA rating of Wall receptacle

What does VA rating of a wall receptacle means ? Just started using Revit for Electrical Design (120V/208V) and came across wall receptacle rated as 180 VA. Just trying to wrap my head around that ...
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0answers
20 views

Finding the impedance of a distribution line from R,X,C values

I have real industry data of distribution feeder with line data consisting of r ,x and c values as shown in the attached figure. ...
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1answer
46 views

Is there a RF signal device for a 120 or 240 vac wire to start and stop a standby generator?

Our standby generators automatically start when a switch in the automatic transfer switch closes and the gen stops when that switch opens. Usually we bury 2 16ga wires along with two 120/240v hot and ...
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0answers
48 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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0answers
54 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
76 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
61 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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0answers
33 views

LCD Dimmer with Variable Resistance Circuit

essentially I'm trying to make a very basic circuit where a 3.7 volt battery is wired to a liquid crystal display, (or LCD), and the brightness of said display is controlled by a pentiometer to ...
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1answer
79 views

Does these terms consider the same Voltage, electric potential, and potential difference

What are the differences between these terms ? do they are considered the same
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1answer
78 views

Gain of a Dual Gate MOSFET

simulate this circuit – Schematic created using CircuitLab This is the schematic of the circuit but tried to find the gain of this circuit, assuming 50 % of the Duty Cycle for the LO, and M2 ...
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1answer
31 views

The best way to test a solar panel generation

Is there any way to test how much a solar panel on a given position can generate for let say a day or few days. Like a multimeter that can automatically test the wattage days example? Or create a ...
1
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1answer
118 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
85 views

What is the relationship between Ground Potential Rise (GPR) and Source Voltage?

I am looking at the results for an earth grid study for a 50Hz substation. Primary Voltage (Vp) = 11,000V Secondary Voltage (Vs) = 415V Secondary Fault Current (If)= 24kA Secondary Grid Current (...
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1answer
31 views

How to know if a motorcycle battery and power generator is enough to keep an device turned on without discharging the battery?

I have an arduino project in mind but I have some questions before I can start to make it. I need to plug an arduino Uno on my motorcycle, but I dont know if it will consume too much energy and lower ...
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0answers
107 views

What is the definition of hull voltage?

I'm studying the subject Electrical Safety in Engineering and a special term really drew my attention. When I tried to google it, no any option was suggested but hull protection. In the presentation ...
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0answers
99 views

Transparent Conductive Paint

Does anyone know of a transparent conductive paint? I am creating some home made electroluminescent panels and I need something what would work with water based polyurethane. Ive had some luck with ...
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0answers
116 views

Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
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1answer
57 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 ...
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1answer
466 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
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1answer
122 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 ...
1
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1answer
527 views

Interface Submersible water pump with microcontroller using Contactor Relay

I am making a automatic water level controller for my home,I am new to Electrical Engineering and learning things. I am using a MCU to turn ON/OFF submersible water pumps using some float switch to ...
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0answers
3k views

Ultrasonic Sensor HC-SR04 without Arduino

I am trying to build a circuitry of obstacle detection. So, till now my research says, I need : ...
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2answers
63 views

How does a transistor sweep generator work?

In particular I'm wondering about oscilloscope sweep generators, but the concept I don't understand remains the same for any type, which is, what does the triggering? I know a transistor can be ...
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0answers
16 views

Measuring consumption of energy supplied from solar plant

I have solar plants installed across multiple rooftops in my space. The output of the 3 phase inverter in each building is connected to the electrical panel board of the same building. The output of ...
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1answer
24 views

Which case count as leading PF in Salient plot generator?

In the figure above we can see the location of two armature currents. In case 1, \$I_{a1}\$ is leading \$Vt\$ (terminal voltage) but lagging \$E_f\$ (excitation voltage). In case 2, it is obvious that ...
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1answer
62 views

Fullsize HDMI vs microHDMI, electrical considerations

I'm going to use an HDMI cable in an industrial setting to connect a screen to a Raspberry Pi. We are considering using the Pi 4 instead of the Pi 3 which we have been using earlier. The Pi 4 has ...
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1answer
87 views

How to calculate voltage and current of this circuit?

I already know the answer of question 1, 2 and 3. 1) 448 ohm 2) 1.6 V 3) 0.13 V About the question 4, why 6V/300 = 0.02A = 20mA is wrong? Can I use current divider like 0.01339 * (3.3 * 10^3 / (...
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0answers
54 views

Need help with capacitor

Hello I have a circuit here that turns on an led when the switch at the bottom opens up. My first problem is that I would like a NO push button that turns off the LED when it’s hit. But I would also ...
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0answers
38 views

Can electrodes be used to transport currents generated by piezo crystals floating inside conductive gel

I have an idea and want to know if this is feasible. The idea is to put little piezo PZT crystals inside a conductive gel, the gel itself is contained by a membrane which receives stress from outside ...
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0answers
21 views

Does zero sequence current flow in line to line faults?

Assuming that there is a prefault load on a line,does zero sequence current flow during phase to phase faults ?
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29 views

Master Control Unit Design

I am designing MCU Board with four layers stackup 1. signal. 2. GND. 3. PWR. 4. Signal This board will supply six Radar sensors each with (12V and 4A maximum current), this board have a power ...
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1answer
44 views

Identifying Correct Power Cable Extension

I have the following power cable for a projector: I need either an extension for the part that goes in to the projector (with the yellow pin) or a whole new power cable and block with a longer cable ...
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2answers
46 views

Digital predistortion of bipolar power amplifiers

What is the peak power limit of a signal beyond which a digital baseband pre-distorter will not be able to correct for nonlinearities: P1 dB of an amplifier? P3 dB? and why is there a limit?
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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
24 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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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
35 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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0answers
61 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
53 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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0answers
26 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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2answers
47 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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0answers
44 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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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?
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47 views

How to develop Differential Conductance dI/dV measurement setup?

I have a Lock-in as sinusoidal Voltage source, DC Current source and Multimeter. Can you please help me to develop a functional setup for dI/dV measurements. How can I design the circuit? What ...
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0answers
40 views

Ballast Power Draw

I am trying to calculate the current draw for 6 florescent bulbs and ballasts. There is one ballast per 36W bulb. I know that the current draw for each bulb would be 36/240 =0.15A (0.6A total) How ...
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1answer
59 views

AC noise to electronic circuitry

I find some random issues that is still unknown. I'm using mean well SMPS 12v, 3A for supply and charging 2 cell battery 7.4v with a charging current 1.2A. The supplies are parallel which is switched ...
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1answer
103 views

Find rotor stator loss in a 3 phase delta connected induction motor?

I'm trying to work out stator input power of a 3 phase delta connected induction motor. I have the equation Stator Input Power (P1), where P1= Pm + rotor copper loss + rotor stator loss. I have Pm ...