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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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44 views

how produce electricity from a spring mechanical energy? [duplicate]

anyone guys have an idea about producing some electricity from a spring mechanical energy ? i have done a research in this site i found a non answered question: How to produce electricity with ...
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4answers
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USA Split Phase considerations?

Much of USA residential is split phase, 120V x 2 and neutral. It’s my understanding the phase difference is 180 degrees of time domain. How are the split phase legs combine to equal 220V? Related: ...
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Building a phone charger 500 years ago [migrated]

Imagine a theoretical scenario where I am transported backawards in time 500 years with nothing but a mobile phone containing all of human knowledge. Clearly I want access to this valuable resource ...
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1answer
41 views

Determine the total electric power of the circuit with 2 types of voltage?

When 3 lightbulb have an electric power of 60, 100, 150 respectively V= 220Voltz. Determine the electric power consumed for each lightbulb that are connected in series when the V=380Votlz I am ...
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0answers
58 views

How is AC load distributed across on-site generation and the utility?

I’m trying to understand the physics behind AC load distribution when distributed on-site generation is installed and the load is also connected to the grid. In the diagram below, I have a building ...
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0answers
11 views

Automatically turn off power to home appliances power supply switches to backup generator [migrated]

Scenario at my home: In my home, refrigerator, washing machine etc and other heavy duty appliances(16A current) and lights and fans are connected to the same power line. It was a mistake done during ...
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2answers
45 views

Finding the waveform of current in a circuit

How do you find the waveform of current i1(t) in the following? Do I need to find the capacitive and inductive reactance then find the current i1(t)?
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1answer
90 views

Can I use a 24V, 1A fuse for a 5V application?

I have a 5V power supply which needs protection. I only have a 24V, 1A fuse. Can I use this fuse for the 5V power supply. As Watt = R * I * I = V * I. As rated W is constant for a given fuse, will ...
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1answer
30 views

Circuit that acts like a NO DPST relay, but only allows switching back to closed when a reset button is pushed

I have a water pump in my van that is activated by a DPST relay when a water level switch in a water container closes. When I drive the van, the water in the tank will slosh around causing the water ...
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1answer
134 views

Are electrical properties measured using the International system of units (SI)?

What measurement system is used to measure electrical properties such as voltage, current, etc.? I understand the units are defined by SI (at least according to this article), but is that considered ...
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0answers
37 views

Booting up a Lomvum T28B multimeter!

I have the above mentioned multimeter; I know this seems trivial but I'm new to this how in the world do I switch it on. There is no indication in its manual of where the power button is. Am I missing ...
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3answers
145 views

What causes a thorn like feeling when your put your hand in water in electronic appliances?

I live in India, the voltage supply in houses is 220V. Sometimes, for example in my washing machine, when it is full of water and I put my hand in it, I get a feeling like a thorn/tiny nail is ...
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1answer
87 views

Why do we not get shocked by neutral wire and how can it behave as it does? [closed]

I read some articles and watched videos regarding 1 phase and 3 phase ac. And later found that for most home appliances we need 1 phase ac. Then I came to know about live and neutral wires. Few ...
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2answers
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What does “reconductor” or “reconductoring” refer to?

This is a term that I seem to remember hearing in reference to electric transmission. I'm pretty sure it has something to do with upgrading a set of transmission lines to carry more current, but I'm ...
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8answers
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What is negative current?

I understand that voltage is relative to ground, so that can be negative. However, I'm currently looking at current-sensors (ACS712 current sensor) and in the performance characteristics table, it ...
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2answers
99 views

Can an electrified wire ever be safe against bare skin?

This could sound ridiculous to someone with an ounce of experience, but I'm just getting started, so here we go ;) Full question is 3 parts... First, what is the lowest amperage needed to light an ...
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6answers
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How can electricity be positive when electrons are negative?

I don't understand how can a for example a battery be positive charged when the electrons are negative charged? I've read that protons are positive but they can't move so are all electricity negative?
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2answers
71 views

How can I connect a sensor to two LEDs so that one will work when the sensor's output is HIGH and the other when it's LOW? [closed]

(Moved from the Arduino stackexchange) Let OUT be the sensor's output. If I connect LED1 to BAT+ and OUT LED2 to BAT- and OUT is this Ok? Instead of LEDs those could be units that need even ...
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1answer
48 views

Help finding voltage between two points

So, how should I proceed to find U_ab (or V_ab)? I have found I = -0.5mA, U_1=-2.5V, U_2 = -0.5V, U_3 = 2.0V. How would I even find U_a and U_b separately so I can apply U_ab = U_a - U_b? Also, ...
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2answers
34 views

The lifetime of a WSN [duplicate]

What formula(s) should be used to determine the lifetime value of a wireless sensor node, charged up by a supercapacitor(its capacitance value its known), with a given power/energy consumption? It is ...
43
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2answers
6k 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 don't the electrons jump the wires and take ...
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1answer
50 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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6answers
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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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1answer
69 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
124 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
443 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
39 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 ...
2
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1answer
160 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
35 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
62 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 ...
0
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2answers
86 views

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
62 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
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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0answers
48 views

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
96 views

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 ...
2
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4answers
84 views

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
153 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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0answers
41 views

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
65 views

“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
141 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
56 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/...
0
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1answer
56 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 ...
0
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4answers
103 views

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
100 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 ...
0
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2answers
72 views

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
76 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
143 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 ...
2
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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?