Questions tagged [electrical]

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70 views

Does anybody recognizes this Electrical Engineering textbook?

today i'm writting this post to ask for some help, not in terms of an exercise or in theory in general, it is just some help to find this textbook, my teacher recommended me to do some exercises for ...
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1answer
44 views

Earth Leakage current understanding

In our design used TRIAC to control the load, As per the product field test setup i should short the neutral and earth connect together also the digital GND is connected with chassis. The input AC ...
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56 views

Meter room safety question [closed]

Is it safe to live right next to a meter room in a 18 floor condominium built in 1970? There is a meter room on every other floor. What is typically in these meter rooms. I know this question is off ...
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1answer
61 views

PCB trace width

I am trying to design a PCB circuit in altium designer. My circuit consists of one ATmega8a, one NRF24l01 and three magnetic relays (mini relay 12V MPR-S-112-A.) I want to set the trace width to 0....
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0answers
28 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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0answers
50 views

Code for N-bit leading zero detector circuit in hardware?

I can write up for 8 bit, but am unsure about N-bit. ...
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2answers
103 views

Is there a way to trade off amperage for voltage? [closed]

I was planning on buying a motorcycle battery or some other large battery to charge my laptop, but most of the batteries I found are 12v or lower, and I need around 20v to charge my laptop. Is there a ...
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0answers
41 views

Are my calculations correct? [duplicate]

The input to this circuit is a periodic square wave with a peak amplitude of 5V and a frequency of 10kHz. Have I calculated the peak output voltage correctly? I get a peak of 4.95V.
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1answer
31 views

Flyback Converter Transformer Leakage Inductance

We are in the process of designing an inverter , in which designing a step up flyback converter is crucial. The problem, we initially faced was there were more step down transformers available than ...
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3answers
79 views

What happens when we connect battery to a circuit?

Example setup: I have a piece if metal and I have 12v battery. When battery is connected to the metal current flows through the metal. So, my question is, does electrons from battery move through ...
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1answer
64 views

Isolation transformer Confusion

I’m hoping someone can clear up some confusion.I understand how an earth reference transformer works and how if there was an earth fault there would be a large rush of current through ground and back ...
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0answers
25 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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1answer
37 views

How to Measure differential conductance dI/dV experimentally?

Numerical derivation of IV curve is always a possibility to deduce dI/dV graph. How to measure it directly in voltage bias mode? What concept is required for it? What instrument are required to ...
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3answers
92 views

Wind turbine charger controller

I need help on my design which includes a wind turbine, charge controller, battery and load. The question is, what will happen to the load if the wind turbine is charging the battery and while it is ...
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2answers
36 views

Looking for Connection Ideas for 12V Battery Pack

I'm working on a project that's requiring the use of a battery pack made from 18650s. 3 of them in series connected to a BMS. It's a 12V supply that is housed in a 3D printed part, length wise of the ...
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1answer
41 views

SPI pins logic level issue [closed]

I have ESP32 and the popular dot matrix module MAX7219 8*8 module to interface. It is connected through SPI pins. After a sample word printing on the maxtix it shows garbage outputs. Is it happening ...
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2answers
60 views

Why we see a spark when we connect a plug into an already switched “ON” socket?

Why we see a spark when we connect a plug into an already switched "ON" socket? But I've also noticed that this isn't the case always, ie. sometimes when connecting a plug into a socket which is ...
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1answer
43 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
29 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
62 views

Can not recognise this piece of equipment. It is attached to the mains

It is normally quite noisy, but has gone silent.
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3answers
101 views

Testing and safety requirements for selling homemade electricals

I am currently researching and designing electrical audio equipment, example devices: Tube and solid state guitar amplifiers Guitar effects pedals Mixing / filtering units Synthesizers Some of these ...
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0answers
37 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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3answers
63 views

220V/1ph/60Hz equipment to operate on 208V/3ph/60Hz

Can an equipment built for 220V/1ph/60 Hz be connected to a 208V/3 ph/60Hz grid by using only two lines of the 110V each across the load?
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1answer
56 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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5answers
110 views

Voltage signal and Current Signal

Please give an intuitive explanation of difference between how a signal or data is carried using voltage and current? I'm wondering even though current and voltage inevitability co-exist, why do we ...
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2answers
36 views

Contact on substrate of a MOSFET

Why do we want to have an ohmic contact on a substrate terminal of mosfet? What would happen if we used schottky contact instead?
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3answers
118 views

why is transformer not considered as an amplifier?

I know that in a transformer the power is conserved on both sides, and hence there's no power amplification as such. That's fine! But if I instead want only a voltage amplification, then choosing ...
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1answer
72 views

Can you connect transistors directly to high voltages or is there precautions neccesary?

I understand that the circuit above will simply work, but what if the voltage input from the battery is significantly higher and the necessary voltage for the motor is high as well? Can you still ...
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3answers
240 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
26 views

Choosing the appropriate power plug for a given fan motor

In a fan motor I have, the written specifications are as follow : "dual power: 110/230v 50/60Hz 22/20w". I would like to power the motor directly, without electronic parts between any 220V wall ...
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1answer
30 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 ...
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0answers
24 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? ...
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2answers
44 views

shorting method of current source and voltage source

I'm learning electronic circuit and sometimes we need to short just the current sources and sometimes we want to short source voltage. my question is: why if I want to short the current source then we ...
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1answer
40 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 ...
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2answers
72 views

Should startup torque be higher in value than full load torque in an induction motor?

I found out values of my 3 phase delta connected induction motor for full load torque, maximum torque and startup torque. My maximum torque was higher than my full load torque, but the thing I'm ...
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1answer
64 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
40 views

Finding value of slip in an 3-phase delta connected induction motor

I know the equation for slip is s= (Ns-Nr/ns)x100 and that to find Ns is Ns= f/p. I have been given ...
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0answers
18 views

How does electrical noise affects signal and distribution power?

What is electrical noise and mechanical noise How does it interfere with power? - signal power - Power distribution/ transmission
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2answers
67 views

How to apply supermesh to this?

Since there is a current in the circuit, supermesh is much preferred. However, how do I do that as the current source is not in between 2 loops? Do I just open circuit at the current source and I will ...
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1answer
34 views

Soldering back the disconnected wires from the charger board [closed]

The attached link images are the front and back photo of the board inside my charger. This charger is used to charger my son's toy car. Unfortunately, the wire soldered on this chip got disconnected. ...
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5answers
177 views

If ground and neutral are bonded at main panel, why aren't all grounded device chassis energized?

I know this is a question with variants that have been asked countless times on the internet and on this site. Believe me that I have scoured through these questions and answers in search for a ...
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3answers
128 views

How to figure out what resistors are in the E12 and E24 series?

Is there a way, other then remembering, to figure out what resistors are in both of these series?
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2answers
203 views

Phasing Order in IEC Color Codes

Currently, IEC 60445 international standard is used for conductor terminal color identifications. I've obtained different versions of the standard (2017 being the latest) and also IEC 60446, which was ...
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1answer
71 views

Impedance load matching

So I've done this so far, and know one of the components is a 50ohm resistor. However I dont know where to go from here. How do i decide if its an inductor or a capacitor? This is a past paper exam ...
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0answers
40 views

Maximum power transfer theorem [duplicate]

Im very stuck on where to go with this question. The examples in class used complex numbers, where as this doesn't seem to need them. Im aware that Zs = Zl, but does Zl=Cl+Rl? Any help with how to ...
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1answer
63 views

Styrofoam cooler/chest ok for electronics project?

I'm building a DIY power supply using 6 server power supplies. I've been looking for a case/enclosure to hold them and the necessary wiring and came across a styrofoam cooler that's the perfect size ...
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2answers
87 views

How current is steady after pinch off voltage?

I was studying the JFET. In the books and other material it is mentioned that when the voltage between the drain and source is increased then drain current is also increased. After a certain point (...
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1answer
78 views

Maximum safe working voltage of capacitors

The answer is 30kV. My method led to an answer of 41KV, where did I go wrong? I believe I cant just add the Vmax(s) at the end, but what would I do instead and why?
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0answers
56 views

Help with determining the open circuit voltage

Can someone go through why Vxy= -84mV? Given the values off VB=180mv R1=22ohms R2=68ohms R3=150 ohms. Many thanks
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1answer
65 views

Compensated vs uncompensated Op Amps [closed]

What are the advantages/disadvantages of compensated and uncompensated op amps? Thank you in advance.