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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 ...

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85 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
103 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
65 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
35 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
479 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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0answers
57 views
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2answers
33 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 ...
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1answer
31 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
29 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.
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1answer
48 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 ...
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0answers
21 views

Loading and Off-Loading Query

I work in an off-grid building (fully off-grid!), and I there is a situation now. We have got six resistive heating elements, and each one consumes 6kW (total 36kW for all six). Whenever we have ...
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0answers
30 views

What is the advantage of a double pole switch over a single pole switch? [closed]

I know that a double pole switch is used to cut off the current in both live and neutral wire simultaneously, but by using a single pole switch,if you switch off the current through the live wire, the ...
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0answers
36 views

In NMOS inverter with enhancement load, why the load is always saturated?

Why the load in NMOS with enhancement is always in saturated mode?
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1answer
30 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
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3answers
133 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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3answers
142 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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0answers
60 views

How would you explain electron pressure across this circuit?

A book I am reading about electronics provides a diagram that depicts regions of high and low electron pressure, and thus voltage, across different sections of conductors in a circuit. Here is the ...
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0answers
49 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 ...
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3answers
65 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
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1answer
58 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 ...
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1answer
26 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 ...
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1answer
88 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 ...
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3answers
121 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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1answer
142 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 ...
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2answers
80 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
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1answer
45 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 ...
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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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0answers
32 views

How to test an EMI Filter & Power Mains Lead using a multimeter

I'm currently trying to repair an iMac A1311 (Mid 2011). None of the diagnostic LEDs come on so I believe the problem is a power issue. Tech aside, how can I test that an EMI Filter & Power Mains ...
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2answers
38 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?
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1answer
58 views

Are watts consumed in wireless electricity? [closed]

If I put a transistor on a coil of wire connected to a 120v AC circuit, and made it so my toaster was now wirelessly powered, if I turned the toaster on would it consume watts that are able to be ...
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3answers
67 views

Is a 5V DC Voltage @ 30mA applied, applied to water, unsafe?

As my question states, I have 5V DC, with an input current of 30mA, being applied across two exposed metal electrodes which are inserted into water. I am trying to measure the conductivity of water ...
2
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3answers
75 views

In what kind of circuit does current flow?

In what kind of circuits do current flow? For a circuit to be "closed" does the end point have to return to the start point like in the first image? If you have a straight line conductor between two ...
10
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6answers
8k views

Am I compensated by the electricity company for electricity that exits my home on the neutral wire? [closed]

DISCLAIMER: I am not an electrician or electrical engineer. Let's say that all I have running in my home is a 10 watt LED light bulb (nothing else). This bulb uses very little of the electricity ...
0
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2answers
261 views

How to compare mAh to Watt hours?

I have a laptop with a battery described as: 3 cell Li-Ion 57Wh I would like to know how this compares to a powerbank with 26500 mAh capacity. How do you perform these kind of comparisons? What ...
2
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1answer
110 views

Electrical circuit with capacitors and transistor

I don't know how this circuit works. So I would like someone to explain me. I know that the qustion is too general, but I am new in electricity and I don't know someone who can answer me how this ...
0
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2answers
48 views

Using OR controller TPS2115A

I have put together a circuit with TPS2115A, it's feeding a camera from two 5V 20Ah (USB) power banks. The IC (TPS2115A) is used in automatic mode, i.e. whichever supply is higher is sourcing current, ...
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4answers
158 views

Measuring voltage across short circuit

Assume a simple short circuit with the probes on a multimeter at any point along the circuit: Can we assume that the voltage read will be 0v, as all points along the wire have the same voltage? If ...
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0answers
49 views

Power calculation for given load

Peak Load Normal/Actual load Currently available 300kW 180kW 200 Amperes The system is currently running on 200A connection ...
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5answers
201 views

Noob questions: I'm confused about conventional current and electron flow and how it runs through and powers a circuit. Can someone please explain?

My apologies if these questions have already been asked and answered, if it has then I haven't found the thread so please link me to it if it exists. I've just started learning about electricity as I'...
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8answers
8k views

Where exactly does the power company cut my power when I fail to pay my electric bill? [closed]

I only have a somewhat vague understanding how the electrical grid works. I know the basics of energy production, and that the electricity comes to our homes using power lines resting upon those big ...
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1answer
72 views

Can I use a capacitor which has 275v +-10% tolerance in a 9V circuit?

I am trying to get parts for a circuit i want to make and I'm very new at making circuits. As a result i'm unsure if i can use a 150nF capacitor with 275v+-10% tolerance in the following circuit or ...
6
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1answer
111 views

Sparks on grounded metal bodies on lighting strikes in the nearby (two miles)

I have a strange phenomenon in our mountain cabin, on the Italian alps: lightning strike on the nearby (not so near: < 2 miles) causes audible / visible sparks on: electric / fire wood water ...
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1answer
63 views

Replacing standard PVC wires with silicone wires

So I got my hands on a piece of silicone wire and I love that it's so flexible and puffy. And seems lighter too. Would it be a good idea to replace standard PVC cables from various small devices that ...
0
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1answer
92 views

How to properly read Watt of a bulb power?

I'm confused about reading the terms Watt, Wh, and Ws of bulbs. Here is the quoted text taken from an electrical book that I'm currently reading on : Now I'm take out some points from the remarks ...
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1answer
122 views

Capacitors in parallel with Voltage Source

Why can't capacitors be connected in parallel with ideal voltage source. In various questions involving it we were asked to ignore the capacitors, by our teachers without valid explanations.
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0answers
37 views

What keeps a delay-off timer energized when you cut off the power?

I've come to understand the function of the delay off timer as follows: When it is energized, it instantly changes its contacts. And when you "de-energize" it, it delays for a preset time and only ...
3
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3answers
1k views

So which direction do electrons really flow?

As I understand it, electrons (which are negatively charged) flow towards positive. As a convention, we say that current flows from positive to negative. Is this to say that what you connect the ...
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2answers
40 views

Network Theorems on DC and AC

Are network theorems (KVL, KCL, Thevenin, Norton, Superposition, Max Power Transfer) applicable on both DC and AC networks
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1answer
159 views

Why does a wind turbine deliver reactive power to the grid during no winds or when turbine is stopped?

An answer to a previous question explained that a turbine in stop mode may deliver reactive power to the grid. It also takes active power from the grid to run its control system, lighting system and ...
0
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1answer
30 views

Circuit direction of flow according to tutorial

I'm following an introduction in circuit electronics, and there seems to be a contradiction in its explanation of the direction electricity flows. First it says that electricity is the movement of ...