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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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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
59 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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0answers
205 views

Does this strategy for crossing electrified water work? [closed]

Inspired by this question : Suppose there is a similarly electrified body of water (dangling wire or equivalent) and right now, the electrical current is sufficiently intense to kill me if I touch it....
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1answer
58 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
157 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 ...
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2answers
56 views

Averaging 1 min kW values

I have some time series data, with values of active power every minute in kW. Now, I am not an electrical engineer, and I would like to average them out per hour. My questions I guess are: do I ...
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1answer
56 views

Protect Inverter from Transformer's Inrush Current

Consider a "small" autonomous grid, which is based mainly on RES and has a few diesel generators, like in the following figure Everything runs smoothly, feeding the small load. Suddenly, the big ...
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1answer
81 views

Measuring resistivity of dielectric liquid

Is it possible to reliably determine the resistivity of a highly resistive liquid above the breakdown voltage (i.e. after ionising the substance)?
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2answers
33 views

Can I connect a 15A surge protector to a 13A extension cord?

As someone who’s studied engineering, I should be able to answer this question. However, a quick search online has me confused. Provided what I’m plugging in (a laptop drawing relatively little power)...
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41 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
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1answer
74 views

Calculate the turn-off delay of an LED in parallel with a capacitor

I am trying to create a Custom turn off delay for an LED. For this I take an Capacitor in parallel to an LED My Idea so far was: I have the General Equation for an Capacitor. And the General ...
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3answers
36 views

Predictions based on resistance measurements not matching reality?

I'm using my multimeter to measure the resistance of my tongue, and leaving it on there for a full minute it seems to average out at around 1.5 Million Ohms. However, when I put a 9 volt battery on ...
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5answers
147 views

Can a 9 volt battery through your bloodstream kill you? [closed]

I usually try to do some research before asking questions on this site, but everything I've found has been contradictory. If I were to direct the positive and negative ends of a 9 volt battery ...
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0answers
103 views

STM32CubeMX USB error “Unknown USB Device(Descriptor Request Failed)”

My STM32 project has an issue about VCP on a CubeMX generated project. When the USB cable is plugged in, the windows10 can't recognise it and in the device manager panel, it says "Unknown USB Device(...
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2answers
59 views

How to use a multimeter to test the resistance of my tongue?

I just purchased this cheap-o multimeter: https://www.amazon.com/AstroAI-Digital-Multimeter-Voltage-Tester/dp/B01ISAMUA6/ref=sr_1_1?keywords=astroai+am33d&qid=1551837071&s=gateway&sr=8-1 ...
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1answer
139 views

Why can my body conduct electricity from a 9 volt battery?

I've created a scenario represented identically in the attached image . My question is this: When I connect Jumper 1 to my left hand and Jumper 2 to my right, the LED turns on very faintly but I feel ...
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3answers
49 views

I have the following phasor −j3e^(−jβx). How can I find just the real part

−j3e^(−jβx) for this phasor I am trying to figure out what to do with the -j3 thats is being multiplied by the expodentional. I am not sure how I can find the real part with this being there.
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1answer
101 views

Strongest electrical wire at AWG 24

Is there any ultra strong electrical wire at about AWG24 (0.22mm)? I want something that would be strong as a steel wire rope but also with low resistance that can used as electrical wire.
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1answer
59 views

Clarity on dB SPL calculation

Based on this post, let me assume that I have a input source of 94 dB SPL / 1 Pa that a microphone is picking sounds from. The microphone has a sensitivity of -46dBV/Pa , this gives 0.005012 V RMS/ ...
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1answer
44 views

NPN Transistor 2N2222 fixed bias MULTISIM

I have been working on my school projects and I wanted to ask you if there is any way of editing BETA for transistor. When I click on transistor, Edit Model is not working. Anyone help me, please.. I ...
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1answer
34 views

Corona and conductor

We are decreasing corona by increasing conductor size and making it hollow but according to definition corona depends on level of voltage so eventhough you make it hollow and increase conductor size ...
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1answer
34 views

Induction loop resistance calculation

I have been trying to build a simple induction loop amplifier. I am using TDA2040 as an output stage and it delivers 10 W (I limited it for that). I am using about 14 meters (1 mm thickness) loop. My ...
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1answer
93 views

speaker problem with high volume

I am trying to build an audio system . I have a speaker which is rated 10 W and 8 Ohms . I am using a circuit from datasheet of TDA2040 with a pre-amplifier circuit with the microphone . when I ...
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1answer
75 views

Can a 125mw dual gang pot handle 10w audio output?

I want to build balance control for two audio amplifier circuits, and I want to use dual gang pot. I want to know if I connected it directly to the outputs of the two audio amplifiers circuit then to ...
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1answer
43 views

What does this bidirectional TVS diode do

This is a schematic for a crude taser design ive been studying. From what i can tell when the switch is on the relay turns on and off continuously, which charges up the LC circuit in which the ...
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1answer
75 views

What defines Volts, Amps, Watts and mAh?

My current understanding is as follows: Volts: Speed of electron flowing. Amps : Number of electrons flowing. Watts: Amps x Volts measured for "some" time. mAh: Very confused to come up with ...
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1answer
36 views

Powering a 12 Volt Air Pump to a 36 Volt Electric Forklift [closed]

I have a 12 Volt Air Pump (300 W) that I use to inflate products. Normally it is connected to a forklift battery with alligator clips and that's how we power it. We have had people ask how to use ...
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0answers
37 views

What if voltage is decreased for an electrical fan (DC Motor)

Will the speed of rotation decrease or increase? I have an idea of Lorentz Force and all that. Use P=VI and V=IR to explain this to me please. I can't understand what will be the outcome of decreasing/...
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4answers
9k views

Why can the regenerative brakes of the Oslo Metro only share energy with other trains if they are “nearby”?

I read on Wikipedia that the Oslo Metro has regenerative braking, but no batteries to store the energy. Therefore, the energy can only be utilized if there is another train "nearby" to utilize the ...
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2answers
87 views

Source and drain of a transistor

Sorry for this question but it's really confusing me everytime I want to solve the equations of transistors. The professor told us that in NMOS, the source is the small voltage, and the drain is the ...
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2answers
74 views

CMOS INVERTER basics

in brief, what's confusing me: whenever the transistor is ON, when I can say it's acting like idea switch? for example why when at cmos inverter if vin=5v then we say the output is 0 instantly, why? I ...
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3answers
72 views

Capacitor effects

I've read about capacitor and its operations, and I'm still confused about this question: lets assume I have circuit which I have source voltage parallel to capacitor and I've waited amount of time ...
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0answers
43 views

How electricity is consumed [duplicate]

I'm trying to understand something about electricity. Is electricity being wasted when you use it? I mean when you use an electrical appliance, you need to plug it into a socket right? So you create ...
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1answer
93 views

How does electricity travel through saltwater [closed]

I know that electricity through normal water is a bad idea. Why not saltwater?
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2answers
137 views

Voltage of capacitor

I'm totally confused why when I attach directly my capacitor to source voltage, the current towards the capacitor will stop at the time that voltage of capacitor reach my source voltage value ... any ...
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1answer
35 views

U.S. Electricity Generation and Consumption and Average Utilization

I would like to confirm that I am on the right track here with respect to electricity generation and consumption. Given that in 2016 the total United States consumption of electricity was 4,137,100 ...
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2answers
94 views

Does Putting More AC Transformers In Parallel = More Power?

I have two high voltage Microwave Oven Transformers (MOTs) and I need to have more power in my output. Since I don’t have two torn apart MOTs I will not be able to show a diagram for my idea. I can ...
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1answer
96 views

Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD

My main limitations here are with the amount of power needed, and of course the price. What I'm trying to do is to run a clothing dryer from the USA in another country, without burning out the drum ...
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2answers
71 views

Vampire power a.k.a Standby Power

What is the use of Vampire Power. Does it do any good?
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1answer
30 views

Considering power loss in a simple series connection due to cable

A friend and I are struggling on a simple electricity exercise: A heater is connected to a \$U = 230V\$ power network over a copper cable. The cable has a cross-section of \$A = 1.5mm^{2}\$ and a ...
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5answers
182 views

How is electricity wasted?

All i know is electric current travels in a loop. So how / where in its way does electricity (electric energy) get wasted? And what do we do on switching electric appliances off? If it's not electric ...
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0answers
93 views

What is the breakdown voltage of the following?

I actually have multiple questions and I decided it would be more efficient if I were to ask a question with multiple questions attached. Background I’m an experimenter that now has a new project in ...
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1answer
88 views

How to calculate current through a resistor and LED?

Question C asks how's to calculate the current over the led and 3k resistor? Can someone please help me understand how to do it?
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2answers
97 views

How current and potential propagate through electrical circuits?

I have something of a theoretical question. In any given electrical/electronic circuit there seems to be an electric field developed inside (and outside the conductors?) to push the electrons in the ...
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4answers
113 views

Can I calculate how much time it will take for an electrical signal to propagate through a TTL circuit?

Given a particular circuit of TTL, can I calculate how much time it will take for an electrical signal to propagate through some section, or all of, the circuit? If I wanted to know how long it ...
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1answer
390 views

Tesla coil troubleshooting help

I'm trying to make a Tesla coil with approximately 200 turns in the secondary coil using 28 gauge enameled copper wire. My primary coil has 3-6 turns with a thicker wire. I've made all the connections ...
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1answer
42 views

Block bids and offers in electricity markets

Why are offer curves and willingness-to-pay (or bidding) curves represented as blocks in electricity markets? What does each block signify? I'm trying to simulate an electricity market using MATPOWER ...
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2answers
491 views

Is the speed of electrical signals always constant within a CPU? [closed]

Microprocessors rely on assumptions about how long it takes for electrical signals to propagate through combinational logic circuits. As far as I understand from reading "Modern processor design", ...
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2answers
61 views

How do 24v or 48v solar/battery inverters provide power for houses that rely on 110v?

I've been learning about solar systems and I keep seeing that the systems feed power in to batteries, which is then fed in to the house via an inverter, typically 24v or 48v. However, most houshold ...