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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.

2
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1answer
99 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.
0
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1answer
47 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
37 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 ...
0
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1answer
30 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 ...
8
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0answers
815 views

Monitor/screen that blanks due to static electricity in my chair [migrated]

I come to you today for a rather special request, but you may be the best people to answer it. I am a developer and I have an Ikea standing desk (automatic one) in an open space. I have a big static ...
1
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1answer
32 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 ...
0
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1answer
68 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 ...
0
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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 ...
0
votes
1answer
34 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 ...
0
votes
1answer
71 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 ...
0
votes
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 ...
0
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0answers
33 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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votes
2answers
70 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
70 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
42 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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votes
1answer
92 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
135 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 ...
0
votes
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 ...
0
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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 ...
2
votes
1answer
93 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 ...
0
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2answers
69 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
29 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 ...
0
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5answers
139 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 ...
0
votes
1answer
81 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
94 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 ...
1
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4answers
110 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 ...
0
votes
1answer
229 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 ...
1
vote
1answer
38 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 ...
1
vote
2answers
485 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", ...
0
votes
2answers
46 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 ...
0
votes
1answer
42 views

Input offset voltage for microphone circuit

Does anyone know what's the input offset voltage (oscillated 2.5V) to the op-amp in the circuit for? From my understanding, the input offset voltage needs to be extremely small so that output DC ...
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1answer
31 views

Conductivity formula for Metals

Is there any expression for the direct change in conductivity of metals with temperature ? I am aware of change in resistivity with temperature.
0
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1answer
62 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
1
vote
1answer
34 views

Stochastic Processes wtih respect to the electric load demand [closed]

I am required to look at the statistics (stationarity, mean, standard deviation etc) of the electric load profile. I decided to use the load data for the IEEE reliability test system as it has all ...
3
votes
3answers
186 views

how does this occupancy-sensor switch not need neutral?

Note, I don't think this belongs in DIY; it's a bit more complicated than that. I bought a Lutron Maestro occupancy sensor switch, and was perplexed to learn that it doesn't need a neutral in the ...
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votes
3answers
189 views

Can 10-100mA kill a person / be deadly? [duplicate]

According to various sources something as little as 0.01A = 10mA can be painful, at 0.1A = 100mA you can expierence * "ventricular fibrillation of the heart". "an uncoordinated twitching of the walls ...
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vote
0answers
52 views

A few questions about copper coils, magnets and induction

So I've been into electronics and electricity in general, lately. I've been trying to understand induction. Here's a few questions I had pertaining to it. In what way are coils connected together to ...
1
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3answers
72 views

Electrical Power production response to complete transition to electric vehicles [closed]

Just wondering if current world wide power grid capacity could handle a complete transition to electrical vehicles. If every existing vehicle was electric would the existing power production handle it ...
1
vote
1answer
61 views

Elements' order in a circuit

I was reading about source transformations and came across an example where there was a change in the order of two series elements, is this always possible? The same for in parallel elements but that ...
1
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1answer
27 views

How to know if a motorcycle battery and power generator is enough to keep an device turned on without discharging the battery?

I have an arduino project in mind but I have some questions before I can start to make it. I need to plug an arduino Uno on my motorcycle, but I dont know if it will consume too much energy and lower ...
0
votes
1answer
93 views

Have i understood voltage correctly?

I am not from an engineering background, so this may be very simple and stupid but: Voltage is the difference in electric potential between 2 points Voltage drop describes the reduction in energy of ...
1
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3answers
128 views

Is there any difference between voltage drop and voltage across a component?

Voltage drop across a component describes the reduction of energy when current moves through passive elements, is this the same as voltage across? What about for capacitors, technically current does ...
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votes
1answer
459 views

Would you get electrocuted if you touched a car battery? [duplicate]

Lets say that you have a connected car battery. If you remove the negative lead first and then touched it would the current go through you to the earth (GND)? What is i then attached a wire which is ...
0
votes
2answers
83 views

insulated wire giving shock

I'm having some problems at my new girlfriend's house. There was a extension cord that was giving shock and I changed to another. This one wasn't giving shock, but when I test it with that screwdriver ...
0
votes
1answer
90 views

Can a house battery share common ground with the starter battery without interference?

I am quite new at this so bear with my questions. I have purchased two 12 volt batteries which I will connect in series for 24 volt and to be used as house batteries. I drive a truck which has a 24 ...
15
votes
4answers
3k views

What is this electric thing, hanging on an electric pole?

Recently I found this plastic thing on a pillar in the village: Looks like it is not finally connected yet, just attached with tape to the pillar. What is it's purpose? 4 cables go down to this ...
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2answers
40 views

How does the chassis ground on an automobile protect against lightning

How does the chassis neutralize the excess of electrons from a lightning strike?