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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4answers
108 views

Can reversing AC polarity of one of two adjacent LED bulbs reduce overall flickering in a room?

Can reversing ac polarity of half of the bulbs in a chandelier bring the flickering out of sync (out of phase) so that half of the bulbs are ON while the others are OFF? I mean the AC polarity of the ...
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0answers
15 views

Identifying live and neutral wire of an old lamp [migrated]

So I have this old wall lamp with a different color code that I'm used to: There are 2 brown wires welded together and a separate dark brown wire. As seen on the picture the 2 brown wires leads to the ...
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3answers
4k views

How have my neighbours’ appliances been damaged?

In the aftermath of the recent storms in the UK, one of my neighbours reported a flash and loud bang from his local transformer station, and the power briefly cut out. After that, several households ...
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64 views

The best way to wind copper wire around rod for lowest resistance

So I have wound 200m copper wire around a rod which gives me 180 Ω, previously I got only ~80 Ω. Both of them were randomly shuffled and the first attempt was on bigger in diameter rod. How to make ...
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1answer
41 views

Electric potential Vss (negative) in Diodes, Mosfets and BJTs

I am studying electronics and I am in confusion with the way the book uses the Vss (negative) electric potential. In particular, let's say, I can imagine Vcc or Vdd as the electric potential obtained ...
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2answers
82 views

Role of the neutral conductor in three phase systems

In a symmetrical and balanced three phase system no current flows on the neutral conductor. Obviously the real electric power distribution systems are not perfectly balanced, so there is a current on ...
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1answer
490 views

Do dead CFL or LED light bulbs consume power and is it safe to leave them mounted?

Do burned-out CFL or LED light bulbs consume power when the switch is on? Is it safer to keep them in their sockets, removed or slightly unscrewed so the bottom center contact isn't touching? I ...
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1answer
57 views

How the electric water heater and stove works? [closed]

I notice that some appliances have heating elements such as electric stove and water heater. I know that both of them using heating elements maybe some type of a resistor or something. I want to know ...
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1answer
99 views

What happens to the electrical grid when I turn on a heavy load?

I'm trying to understand exactly how an electrical grid works, and I'm having one simple question that is challenging me. What happens when a new load appears on the grid? I know in practice that any ...
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5answers
4k views

Does coiling and straightening a wire change its resistance?

I’m looking to make my own kiln coils and I wanted to know why are the coils coiled? When the coils are stretched too far apart they run cold and when they are close together they run hot. What is ...
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1answer
57 views

If I have a device drawing 300mA @5V and I need to use a 15V PSU what current rating do I need for the PSU?

I have an application with multiple components and multiple voltages in use and current calculations are giving me a headache. A simplified version of my application would include: 1x device ...
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1answer
62 views

Fullsize HDMI vs microHDMI, electrical considerations

I'm going to use an HDMI cable in an industrial setting to connect a screen to a Raspberry Pi. We are considering using the Pi 4 instead of the Pi 3 which we have been using earlier. The Pi 4 has ...
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2answers
149 views

Can a switching power supply kill you?

I'm curious about one thing. Can a switching power supply with 24V - 4.5A output can kill you if you touch its outputs directly? As I know, just a 100mA may kill you too, so is it safe to use ...
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1answer
144 views

Cost to run an Arduino device 24/7, simple maths question

I have built an Arduino window automatic closer/opener. When the device is on stand by mode, it draws 12V DC 0.025A. My quesiton is, how much yearly I need to pay to have this on standby mode? Would ...
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1answer
31 views

Plastic Plugs in Surge Protectors or UPS

Would plugging 4 out of 7 outlets in a surge protector or UPS with plastic “safety plugs” to keep out dust/dirt harm the product in any way? I know that plastic is an insulator and it might affect ...
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2answers
90 views

Are ESD safe tools necessary with proper setup?

My current setup is an ESD mat and ESD wristband both connected via alligator clips to unpainted screws that are screwed into a secondary PC power supply (not mounted in a PC case.) This power supply ...
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1answer
43 views

Understanding CFLs in Electrical Circuits

I wish to have a better understanding of how CFLs work in a electrical circuit like a home. A CFL broke a little towards the top when I touched it. I noticed it light up at the bottom and then made ...
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1answer
75 views

Battery for Specialized Device

The battery on a specialized device has gone bad. The company wishes to charge me an exorbitant amount of money to replace it. I do know that it is a 12 volt battery, however I don't know the amperage ...
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2answers
113 views

Grounding Yourself When Working On Electronics

I was wanting to discuss if using a wrist strap connected to a in unpainted screw on a pc power supply (this screw is a mounting screw it is not touching anything inside the power supply) that is not ...
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1answer
42 views

How can I override a capacitive touch on-off switch? [closed]

I bought a floor lamp for use with a mechanical timer that turns electricity on and off using a set schedule (for example, when you're away but want to convince others that you're still at home). ...
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2answers
185 views

Why is the capacitor in this circuit not becoming an open circuit?

In this circuit you can find an RC circuit and 4A DC current source. I thought that if we use a DC voltage source instead of a DC current source, this circuit would become open circuit after a while. ...
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1answer
60 views

Converting Magnetism to electricity

I've been seeing a lot of videos online of people using neodymium magnets to make a motor spin to generate electricity. If we can generate electricity from magnets why isnt this being used more often?...
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1answer
77 views

Calculating the internal resistance [closed]

I have build a circuit: The power source is a battery. The rectangle (below the amperemeter) is a resistance. I have measured U (in Volt) and I (in Ampere) for the whole discharge process. Now I ...
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1answer
123 views

Why isn’t this way of generating electricity well documented / not at all?

After looking up different examples of inducing a voltage in a coil on Google and Youtube, I cannot find this being a known way of generating a voltage. In the image the brown arrow is the direction ...
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2answers
78 views

Why do LEDs have/need positive and negative nodes to function whereas say resistors don't? [closed]

I'm very much a beginner experimenting for the first time with electronics, and I'm still trying to grasp the basics. On my breadboard, my LEDs have to be setup in a very specific way for them to work,...
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1answer
133 views

Many three phase Identical motors connected in parallel but have different speed why? [closed]

My teacher asked me a question that many identical three phase motors are connected in parallel with same rating and also mechanically they are same but there is 2 motors which was running at slow ...
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1answer
75 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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2answers
69 views

Why do current transformers saturate with high short circuit currents?

When there is a severe short circuit current due to the faults in transmission lines ,sometimes current transformers get saturated.Voltage of the faulty line drops sharply but ct still saturates.As ...
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1answer
77 views

Microwave rotating plate

I noticed that the rotating plate of many microwave ovens usually rotates with a specific direction, even if sometimes this changes. What makes the plate rotating clockwise/counterclockwise? I know ...
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1answer
101 views

Electroconductive fabric

Just by looking at the pictures, can anyone help me identify what kind of blanket the copper strips are glued to? The kind of material and composition. Apparently seems to me to be a very thin glass ...
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1answer
47 views

How can I make a li-ion charger using logic gates with auto cut-off facilities? [closed]

I'm recently assigned a project to make a battery charger, using logic gates. But I have no idea how to proceed. I'm in need of guidance. I have basic knowledge but not so deep. So I think I can ...
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1answer
43 views

Voltage drop in a conductor

My textbook, Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk, says the following in section 2.3.1 The Mechanisms of Voltage: In regard to potential energies of free ...
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1answer
233 views

Understanding a Transformer Blowing

A transformer blew around my area. For what I can tell the power did not go out in my apartment but the other complex near me, their power went out. Would a transformer blowing near my complex cause ...
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1answer
65 views

Short Circuit Scenario to understand short circuits

I am trying to describe the best I can the scenario I came up with in order to try to understand a short circuit. Let’s say there is only one main circuit breaker and there are two outlets in the ...
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1answer
72 views

Crock pot on power inverter

I have a slow cooker crock pot thats uses 120 volts AC which range from 0.6 amps to 2 amps and consume electricity that ranges from 70 watts (low temperature) to 250 watts (high temperature). When I ...
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0answers
30 views

UPS vs Surge Protector regarding short circuits and quality of power

I did research before posting and it seems a UPS filters power so that it is constant and “filtered” additionally it seems to be able to protect against short circuits. Does a surge protector have ...
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2answers
82 views

AC Power Socket Connector without polarity connected to switching power supply module

I bought a switching power supply module to convert ac power from wall into dc for my electronic Projects. It looks like this: it looks like that without the case/cover: I plan to connect the module ...
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3answers
103 views

Further understanding Ohms Law

I posted a question earlier that helped me to understand Ohm's Law and how power is lost to length of wire due to resistance. So my original example was a 15A, 10ft cable surge protector plugged into ...
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1answer
71 views

Distance and voltage/watt loss?

I have read multiple posts on here regarding voltage/watt loss but I wanted to see how it would apply in this situation that I can not seem to solve using available resources. Maybe I just do not ...
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1answer
151 views

Slayer exciter(Mini Tesla Coil) Not Working[IRFZ44N]

I made a tesla coil as https://www.youtube.com/watch?v=Ca2e3evwVK0 's circuit. the MOSFET seems to be getting hot and current passes through the primary but I get no response from the secondary. ...
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0answers
45 views

Is it safe to make common ground between multiple voltage planes

I have a system where I have two power inputs and a single power output. One input from a battery(13v, 10A max) and one from solar cells(19v, 10A max). Then there is an 12v output which I connect to a ...
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2answers
96 views

How does the circuit close when I touch a live wire with grounded feet (touching the floor)?

When I touch the live wire from a power socket with my bare foot on the floor, how does the circuit close (how does the current return to the supply)? First of all, how do tiles in the house floor ...
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5answers
13k views

What is the speed of “electricity”?

In a distribution grid, what is the speed of energy signal Is it strictly the same? And how is synchronisation achieved? Is an electric grid essentially an orchestra where everyone is the chief ...
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3answers
94 views

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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1answer
42 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
59 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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2answers
61 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
99 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
31 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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