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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3answers
68 views

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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2answers
68 views

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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2answers
52 views

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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30 views

Can I charge my phone using piezoelectricity or peliter [closed]

I was wondering If I could use the pressure from a phone case to make a piezoelectric module create electricity and then charge my phone. If that is not possible is it possible to charge my phone with ...
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2answers
58 views

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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1answer
41 views

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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2answers
66 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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0answers
28 views

Help with welder connector [migrated]

Hi I recently purchased a chicago electric 170A MIG welder. It runs on 240V and it draws 20A (single phase) but it has a 50a plug on it (nema 6-50). My dryer outlet is a four prong 240v 30a outlet (...
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1answer
51 views

Ohms law, resistance calculation

I'm new to electronics and I don't understand why you subtract source voltage by the components recommended voltage, but you just divide by the recommended amps... Why don't you subtract source amps ...
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2answers
54 views

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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1answer
56 views

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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0answers
77 views

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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1answer
40 views

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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1answer
23 views

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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1answer
44 views

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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1answer
66 views

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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2answers
210 views

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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2answers
63 views

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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1answer
74 views

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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1answer
39 views

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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3answers
121 views

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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0answers
28 views

Can I use the ground wire of the grid with the power from my inverter?

In other terms : Can i connect ground wires 1 and 2 together ? EDIT : I'm in France, Grid is connected to a ground rod. System is 230v AC.
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0answers
41 views

What is the process behind the forming of a low voltage electrical arc?

I am trying to understand the exact process undertaken when forming a low voltage high current electrical arc, such as in a welding scenario. My understanding at present is that without a high voltage,...
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1answer
104 views

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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1answer
106 views

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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1answer
41 views

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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2answers
62 views

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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0answers
21 views

Measurement of dissolved solids, dissolved oxygen and carbon dioxide

I am pretty new at this, so I apologize beforehand if this is a stupid question: I have a task where I have to measure dissolved solids, dissolved oxygen and carbon dioxide in water via a sensor. ...
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2answers
121 views

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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0answers
40 views

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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2answers
48 views

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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1answer
62 views

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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1answer
38 views

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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0answers
26 views

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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1answer
72 views

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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2answers
45 views

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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0answers
60 views

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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0answers
17 views

How do i set up an offset antenna?

How do i set up an offset antenna? I have two offset antennas. 1 for receiving and the other one for transmitting, they are at the same altitude. I don't know how to set up the angle because the beam ...
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3answers
66 views

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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2answers
51 views

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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1answer
24 views

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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1answer
34 views

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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2answers
59 views

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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2answers
66 views

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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1answer
35 views

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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3answers
541 views

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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12answers
5k views

Why is electricity consumption billed in watts and not amperes?

Basically the subject. Why would companies bill for wattage instead of amperes?
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2answers
57 views

What is the effect on power grid when utilization goes down some threshold?

Today (April 5th, 2020) at 9:00 PM IST, people across India are expected to switch off lights for 9 minutes. This has apparently raised concerns that there would be problems to the power-grid, due ...
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5answers
133 views

Does decrease in voltage decreases the speed of electrons in a series circuit?

Let's say we have a 5V battery and a ohmic conductor that consumes energy connected in a series circuit with constant resistance. When we increase the voltage, the number of electrons flow through a ...
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0answers
50 views

what is the dc male connector size that fits a dc005 2.0mm jack?

What should be the right size for the jack cable male connector to fit in a dc005(5.5mmx2.0mm)power socket? Should the cable be 5.5mmx2.1mm or 5.5mmx2.0mm?

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