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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Change capacitor

I have got a question about capacitor.Used in monitor. Here is my "Broken" capacitor And here is my "New" capacitor. With same parameters but they both have a different I don't ...
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What actually flows, current electricity or charge?

I'm new to electricity and electronics, I started with the essentials on Sparkfun but I'm a little bit confused. On What is Electricity? under Current Electricity: Current electricity is the form of ...
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What is the best way to convert a 10V power supply into a 5V power supply?

If you were given a 10V power supply and wanted to power USB devices with it, how would you convert it to 5V? Would using a voltage divider splitting it into 2 5V lines be the best? What ohm resistors ...
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3 answers
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Is there a way to prevent blowing incandescent bulbs from tripping the fuse/MCB?

As this is the main cause for MCB tripping in my home is there a way to prevent this from happening (either by lowering the voltage or being able to tell when a bulb is close to the burnout point?) ...
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Can a machine be powered with food energy? [closed]

Would it be possible, in principle, to create a machine that digests food in a similar way as humans do, extracts energy from the food, and stores it as electrical energy in a battery to power its own ...
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How to trace a wire hidden behind plywood wall? [closed]

I have multiple electrical lines running behind my plywood wall. Unfortunately, some wires got lost behind the wall and the electrician is unable to trace them. Now the wire which I want to trace has ...
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Can power outlet be taken as a current source?

Consider a situation where I have a power outlet and I am completely unaware of the internal circuits and the fact that the electricity comes from an ac voltage source supplied by some company. I just ...
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How do electric utilities determine the Load Demand on the network?

Provided that electric utilities are tasked with ensuring that the load demand is always met, how do these utilities determine load demand to be met in the first place in real time rather than using ...
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1 answer
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What is the relationship between Power Generated in the grid and Voltage delivered?

I am trying to understand how the grid works. Lets say we have some gas turbines, where we have a combination of air and fuel being used to turn turbine blades which in turn drives a generator to ...
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14 answers
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What, exactly, is voltage?

I'm 15 and recently started electronics and I'm having trouble understanding voltage. I've read so many articles and watched so many videos about voltage and they all give different answers. Some of ...
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Does the negative terminal of a battery have a higher concentration of electrons?

I'm 15 and recently started electronics and I just had a question about batteries. According to a video I watched by "The Engineering Mindset", a battery creates potential difference by ...
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What happens when base voltage is higher than the collector voltage in a bipolar NPN transistor?

Does the base voltage has to always be (0.7v) in order for a bipolar NPN transistor to work? what happens if the base voltage increases or decreases? I'm really not into the technical stuff I'm just ...
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Ground Earth Resistance explained in electrical system

I have several questions about the electrical systems used in the field and the grounding mechanisms. So, as far as I understand there are multiple systems that can be used to distribute electrical ...
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Is it possible that the line frequency can change along the distribution network?

We use single-phase 220-230V~/50Hz here in Turkey. The line frequency may vary ±5%. One of my colleagues told me that he measured the line frequency in a factory (probably a customer's factory that we ...
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How to select a Relay that can handle a load of 42V, 3A DC?

I want a relay that can be controlled by a Raspberry Pi and can handle a load up to 42V and 3A DC. I was looking at this: relay which is rated at DC 30V/10A. Although, 30V is less than 42V but I was ...
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Actual power consumption of a smartphone charger

When I search on the Internet "How much power does a smartphone charger consume?" it shows "3-7W". I know Power = Voltage x Current. Based on the equation and the input ratings (...
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601 views

Led ON on Spike Guard Even When Switch is OFF [closed]

I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the ...
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Need to check ON or OFF state of a wire using non-invasive method

We have a GSM SMS alert system (mod bus) that needs a signal that a wire (any wire from 3-phase) has current (maximum 15 amperes in ON state) or not, so we can know if the system is ON or OFF. There ...
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Building a Bio-impedance system

I currently have a project that has integrated sensors to monitor human health and related biomarkers, my domain is human-performance so giving athletes the tools to get better at their respective ...
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Voltage doubler operation

I searched the voltage doubler circuit and I understoond how it should operate but I don't understand something. simulate this circuit – Schematic created using CircuitLab This is a voltage ...
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2 answers
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2-wire vs. 3-wire watt-hour meter?

A kWh meter (electromechanical induction meter) is installed in front of each room in our apartment to measure the electricity usage of each room. Each room has its own breaker box to set up the 110-V ...
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Is it ok to work with cigarette lighter power supply directly [closed]

I need a way to test some 12v appliances; so to get the 12v I am thinking of getting a cigarette lighter power supply adaptor which converts 240v to 12v. But I don't need the cigarette socket; just ...
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About signal conversion

Question is weird but it's about something that I really want to try. AC power here in India has 50Hz frequency. What I really want to try is to make a series path with two continuous conversions. In ...
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1 answer
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Voice changing chips [closed]

I have seen this video: https://youtu.be/FMsdEfou_kc?t=44 on youtube. And I was wondering if something like these voice changing chips are electrically possible. I have tried googling for something ...
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3 votes
2 answers
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Why do we connect neutral and ground at the transformer? [closed]

Why do we connect neutral to ground at the transformer, why can't we just connect that neutral to the ground at our house?
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How to choose cables for different amps

I am trying to make a diagram for caravan electric system.As a part of it I have to recharge my batteries from shore/main current. I am thinking of using 230Ah AGM batteries. I will use a 30A 12V ...
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Can we use Litz multi-strand wire as Tesla coil secondary?

I am making a mini Tesla coil as a proof of concept. I was thinking, can we use multiple enameled copper wires as the secondary? (Edit: Every wire is individually enameled and the ends sanded to ...
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1 answer
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Why stationary armature is preferred for commercial use

While reading a book on electrical machines, I found a point that says that for power generation, a stationary armature is the preferred type. If in any generator, there must be moving parts, why is ...
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What's the use of neutral wire in single phase home supply? [duplicate]

I am aware that the neurtal wire provides a return path for the current to the power source. But that neutral wire too, is connected to the ground at somewhere between the load and the source. My ...
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1 answer
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Is this scenario an efficient way of generating electricity?

I will try my best in order to provide information which could help you imagine the scenario. Accurate results are not compulsory. I am generating electricity using a 5kW alternator but for the ...
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Can anybody tell me what these three white boxes are at the bottom of the power pole?

Can anybody tell me what these three white boxes are at the bottom of the pole? And how can I tell the number of the circuits on the electrical power pole and what voltages they have? Also, can I see ...
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Relationship between resistance, amperage, and propagation length of signal

n electrons sent into a wire of length L, and n/2 electrons sent into a wire of length L/2, diameter unchanged and wire material unchanged, does the "signal" of electron propagation reach twice as far ...
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Can i use welding cable as primary coil for Tesla coil?

I am trying to make DRSSTC (see NOTE1) and struggle to find copper tube for my Tesla coil, so I'm looking for other stuff that I can use for the primary coil. Now I think, can I use welding cable like ...
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What can cause oven’s heating element to deform?

What can cause a heating element to deform this way? My oven is tripping the breaker whenever I turn on the heating, LCD and light are working fine, the front LED flickers though! The model of the ...
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New to AC to DC conversion!

I'm new to this forum, so apologies if I am posting this in the wrong place. I am looking to start a DIY project, and this entails electricity and water; I know, two things that shouldn't ever be ...
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Electric frequency conversion from very low frequencies

I have designs for diy home generator that at the scale I’m currently building will output a very small amount of power at a very low frequency, varying between <1 and ~2 hertz using 2 pole magnets....
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-4 votes
1 answer
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Can you use an extension cord for Induction Cooktop and any Mosquito Repllent device? [closed]

I have this kind of extension cord. And I have this 2000 W induction cooktop. The mosquito repellent I mentioned is like this: Can I use them safely on extension cord instead of using them directly ...
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Equivalent resistance problem

By the use of symmetry, I have found that equal currents will flow through opposite edges like A-C and C'A', but still, the use of kirchoff's current and voltage laws lead to four equations in four ...
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Converting 110V AC to 12V DC [duplicate]

I am currently moving to a location for work that has a 110v electrical connection but no water connection. I was attempting to use an RV water pump in order to create a plumbing system for my sink ...
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-2 votes
1 answer
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How to detect if the logic PCB can successfully communicate with the power PCB

In most devices (As washers, refrigerators etc.) you find a logical board (The one the user interacts with and mostly has the buttons and a digital or an LCD screens etc.) and you find the power board ...
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2 answers
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Minimal information energy conversions [closed]

I am trying to make a generator and before making it, I would need to know how many kWh it generates, in order to make sure it is actually feasible or if I should redesign it. I am just a highschooler ...
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How to connect a home to the government electrical network

I want to connect my home to the government electrical network, I used twisted cable, my home is 200m meters from the nearest electric pole. How do I calculate the twisted cable section?
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3 answers
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Help in choosing correct power supply for LED matrix

I'm quite new to electricity and electric components. I'm building an LED matrix from scratch on a small PCB. I will be using an IC for multiplexing, Transistor for controlling external power supply ...
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2 answers
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How to calculate the safe AC frequency at high Voltages?

If someone wanted to build some kind of machine which produces HUGE and completely safe electric arcs, how would you calculate the frequency of the AC current in relation to Volt to make it safe? Why ...
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How will equivalent EMF and resistance of cells be calculated

In the image, three cells are arranged in a circuit. But the cell in the centre is installed such that the positive terminal is connected to the positive terminal of one cell and the negative terminal ...
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How to calculate the cell constant for a flow-through conductivity cell?

I need to design a flow-through cell but I don't know how to calculate the cell constant for such a cell. It needs to have 2 ring electrodes within an insulating tube (see pic below). One of the ...
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How to calculate V in the following questions? What does the two arrows mean?

What does the two arrows means in the following questions?
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Electromagnetic compatibility problem with an hairdryer

I wanted to ask you if you could give me an explanation of this electromagnetic compatibility problem. I connected my (fully working) TV to a certain electrical socket in my house. I have also a ...
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Do pieces of wire or metal in general affect the inside of a Faraday cage

Building a Faraday cage and wanted to know do the dozens of metal staples and several small pieces of wire have any effect in terms of acting as an antenna?
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5 votes
3 answers
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Hybrid gas electric drone

I have a nitro engine that’s idling at 1600 RPM. As the title says , I also have a BLDC coupled directly to the nitro engine working as a generator. That generator is capable of producing 3.5kW of ...
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