Questions tagged [electricity]

For EE.SE purposes, the creation (battery/generator/solar cells), storage, control and transmission of electrons. This can be broken down into sub-topics such as voltage, current, reactance and ohms. These can be broken down into more sub-topics such as electromagnets, coronas, heat, ESR, EMF. This excerpt just touches on all the endless fields electrons are involved in, including physics.

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1answer
26 views

Why don't electrons take the shorter path in coils

Below is a copper coil presumably forming an electromagnet. From my understanding the electrons travel around the coil to produce a magnetic field. But why dont the electrons jump the wires and take ...
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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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Meter room safety question [on hold]

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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Will using a resistor in series with a LED to control its voltage increase the total energy expenditure? [duplicate]

This might sound like a stupid question, but I want a confirmation. I watched a video on Youtube about using LEDs. Those LEDs required a voltage around 2 volts at 20 mA. In order to power one LED ...
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65 views

How electric poles are distributed and placed

Complete newbie to anything electricity-related so would appreciate an answer I could easily understand! I'm wondering how electric poles are placed around an area by an electric utility company? ...
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2answers
121 views

Is there such a thing as a 24V DC computer? [closed]

Same as the title : Is there such a thing as a 24V DC computer ? There is a 5V computer called raspberry PI, but I'm looking for something like 800W-1000W computer working with 24V DC.
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1answer
441 views

How long does it take for electricity to be considered OFF by general appliances?

I'm looking for an ATS (or DIY) to switch between my solar and grid power. I've seen some automatic ATS like here I've seen on youtube someone uses this model and his computer is switching between ...
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0answers
38 views

measuring resistance vs measuring current

I'm doing a dc resistivity test and have the option of measuring resistance or current to calculate the resistivity of a sample where a known constant voltage is applied. Is there an advantage of ...
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1answer
106 views

Why does the voltage of a lead-acid battery drop with load?

My solar power system contains a lead-acid battery but as soon as I use the inverter to power some load, the voltage drops instantly by 1 volt. Why does this happen? And is it proportional to the ...
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1answer
31 views

Gauss' law for two point charges?

When we model electric field as something that represents the "flow" of something that is conserved, we can prove that the flux due to a single point charge, through the following surface, Flux ...
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1answer
61 views

Is Mica non-conductive?

Are mica flakes like ones found in makeup and body lotions completely non conductive and should I be worried if it gets inside the components of my computer? Or should I be more concerned about ...
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2answers
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Why do stoves need not be connected under the earth leakage?

On some stoves I've seen stickers stating that the stove doesn't need to be connected under the earth leakage... Which is rather confusing since we need to earth it in case of earth faults. I'm just ...
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2answers
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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
42 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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Question about Biot Savart Law using vectors

This is a Biot savart law question using vectors and I tried this question and I want to check my answer is correct or not. And please show me the correct answer if wrong. I uploaded my Answer. ...
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4answers
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How do I successfully connect a 3 phase motor using single phase 220 v?

I have a plastic crusher with a three phase motor and I will like to operate it using single phase 220v. Can anyone please help me out with instructions on how to connect it? Also, I want to know ...
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4answers
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Earth potential and grounding

Electrician apprentice here. Earth potential is said to be 0 volts. Let’s say I have a star-configured transformer which supplies me with voltage. Let’s also say that the transformer is perfectly ...
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5answers
146 views

When you connect two batteries in series, why doesn't the middle short?

When you connect two batteries in series, why doesn't the middle short? The connection between the positive terminal on one battery and the negative terminal on the other battery has no load, so ...
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Why does no current flow when GND of one battery is connected to VCC of other battery? [duplicate]

I have enough experience with electronics to design and solder working circuits. I never quite understood though why circuits must be closed for current to flow. I alway understood electrical current ...
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1answer
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“Ground” in electronics [closed]

I have GND on the circuit as a reference. Let's assume I have source voltage connected serial with resistor RS and resistor RD and then connected back to the source voltage. in brief the source ...
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1answer
48 views

Equations of KVL of the circuit [closed]

There is something really confusing me. If I have acquired an equation from my circuit (electronic circuit) of KVL like ID=VSS-RS*IS then can I assume, for example,...
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5answers
109 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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1answer
50 views

How many hours should I charge this battery? [closed]

I have a charger and two batteries, the charger has output 250mA with voltage 2.4V, the battery is 1900mAh with voltage 1.2V, how many hours should I charge this battery? Should I charge 1900*1.2/250/...
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1answer
55 views

Why does a dielectric liquid need to immerse the parallel plates in a conductivity cell?

For a parallel plate conductivity cell with a liquid dielectric in between, after filling the liquid to the point where it is just enough to fill the space between the two electrodes, does the liquid ...
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4answers
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Why are replacement plugs in the US only rated at 125V even though many of our devices can also be run on 220V?

When I search for replacement plugs at Home Depot or Amazon (US), all I see are plugs rated at 125V. Even plugs marketed as "heavy duty" are still only 125V. Here is one such example. The only ones I'...
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2answers
97 views

Cannot jump-start car directly when I disconnect the dead battery

So I have a car B with a dead battery and a good functioning car A. I remove the dead battery from B and connect the terminal directly to car A's battery terminals. I cannot start car B. I tried to ...
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2answers
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When jumpstarting a car, why do I need to wait a bit for the bad battery to charge a bit?

So I have a car A with dead battery but good everything else and a car B with good battery. What I did was disconnect car A's dead battery, connect car A's terminals directly to car B's battery. When ...
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2answers
75 views

How can I make a failing relay more reliable?

I have a non-accessible relay that I believe is failing and working intermittently. It doesn't need to actuate more than once or twice a week. It is activated with 12v and switches 12v 15amps. If I ...
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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
139 views

Signal filtering, what's wrong with the circuit?

I have this circuit where I receive a protocol signal: The +L_IN signal is this: This signal has a 28V DC voltage. The signal at ...
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1answer
110 views

Are there any electrical components which may keep electricity inside them after the device is turned off?

Is there any electrical component where electricity may remain after a device is turned off?
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25 views

Concentric cylinder cell constant

For a concentric cylinder cell (with liquid dielectric), mathematically the equation for the cell constant will always yield a lower value than for the parallel plate case for the same volume of fluid....
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1answer
59 views

Assembling and Dis-assembling a Charged Capacitor

If I have an electrolytic capacitor, which is a cylindrical body in which the two plates are rolled-up with a dielectric paper in between them, of very high value (say 1F) and I charge it using a DC ...
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Nidaq Timing Issue? Sensor Readings Consistently Early

Testing our sensor via Nidaq. When target gas interacts with sensor electrode, electrical impulse given and read to nidaq, basic setup. Our readings are consistently showing detection early - ~8 or ...
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1answer
24 views

Fringe field effect: calibrating vs guard electrode

Which method is more effective at limiting errors associated with the fringe field effect when performing a liquid conductivity measurement, using a guard electrode or using a reference liquid to ...
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1answer
24 views

Fringe field effect in cylinder conductivity cell

In a coaxial cylinder conductivity cell with the inner electrode electrified and a dielectric liquid between them, how is the fringe field effect dealt with? Is the effect as severe as in a parallel ...
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0answers
24 views

Cell constant and conductivity cell design

When comparing a concentric cylinder and parallel plate design for a liquid conductivity cell, which design is more favorable to get a smaller cell constant in a practical setting and why? (See below ...
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44 views

Adequate Power Supply for 300 Daisy-Chained LEDs [closed]

I have 300 LEDs (ws2812b) wired in a series. They were sold as 150 LED/5 meters and rated to power at 9W/m, so 45W/5m strip. I would need 90 Watts to power my entire 300 LED strip. I have a 3-rail ...
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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
83 views

Wireless Electricity Transmission model not working. Why?

I made wireless electricity transmission model using the principle of magnetic inductive coupling to transfer electricity between two separate coils. The model is very simple, known to everyone and ...
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0answers
41 views

Choosing the right power-switch with LED for a simple electrical design

I want to add an ON/OFF switch with an integrated indicator LED to a very simple electronic design, between a 9v battery and the connected module that it powers. What should I be looking at to select ...
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1answer
68 views

How to calculate the 3dB point?

I understand this until the final two lines. How does he get from 27.8766 to 1149.8hz and 7224.7rad/s?
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what is the difference between active and reactive power?

What is active and reactive power ? does the active power means power flows from source to load and reactive power as its vice-versa?
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2answers
55 views

Nodal analysis of a basic DC circuit

I am trying to find the v1, v2, v3 and i5 using nodal analysis. I gave the name to the current over the respective resistors i3 and i4 and put it as i0 - i3 - i4 = 0 also write the equations as i3 = (...
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1answer
48 views

200AH lead acid battery

I have a 12V 200AH lead acid battery and I want my load be a power resistor and a bulb. Does the batter draw current based on the load resistance? so meaning the current that will be drawn in this ...
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0answers
51 views

Difference between DC and AC liquid resistivity measurement

After reading a bit online it seems for more conductive liquids AC current is used to measure the resistivity which is apparently to do with polarisation effects, while this effect is negligible in ...
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1answer
63 views

Current flow in circuits and nature

This video shows that current only travels in circuits or "circles". This is in a way intuitive because a battery needs the electrons to return otherwise the reactions inside won't continue (I guess). ...
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6answers
1k views

Could transporting electricity using plastic water pipes be feasible?

Normally a household is connected with 3 different connections: Waterpipes Electric cables Internet fiber Water conducts electricity (and can also transport light), why aren't we transporting ...
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1answer
66 views

How does peer-to-peer energy trading work?

I am relatively new to the topic, with not the greatest electrical engineering background, so these questions may sound simple, but I still cannot figure out how certain platforms such as piclo, ...
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3answers
160 views

Static Electricity Accumulation

I don't know much about electricity. I live in an old building experiencing bizarre electric phenomenon. The building might have bad wiring, I live near elevators and power distribution for the entire ...