Power lines Definition and 47 Threads

Hi, The photo shows some objects suspended on a power lines near an airfield Here is the location of those objects on a map: The 3 pink circles are the oranges balls in the photo. Which seem to be Aerial Marker Balls. QUESTION: The pink triangle is the cone shown in the photo. What is...

Here's an article(labeled as opinion) I just read from CNN: https://www.cnn.com/2023/08/16/opinions/chemicals-in-clothes-harmful-health-wicker/index.html This OP is only a starting point; I intend to look into the issue more deeply. But from what I see, this article (not unique these days) is...

@anorlunda suggested I start a new thread about this: See: https://www.physicsforums.com/threads/grim-day-on-the-texas-power-grid.999764/post-6521013

Hello All! I'm new in this forum, so if I select wrong subject or something then sorry. I'm very, very far from physic, so I need your help. In work, I have to calculate max current for HV power line. As input have conductor temperature [*C] and material parameters (the resistance in ohm of the...

I know the answer, because they are not grounded and do not complete any circut, but I have a different analysis that I would like to explore. First, why do you need a closed circuit? Because if you have a battery pushing current along a wire that ends, electrons will accumulate at the end of...

This is going to be a very basic question, but something that has bothered me for a while. It was triggered again by this thread from @OmCheeto: https://www.physicsforums.com/threads/new-deccan-trap-turns-out-to-be-downed-power-line.970313/ Why is it that when a power line is downed, there is...

Hello, I'm trying to send binary data over the power lines to a microcontroller, which triggers a relay turning on a light. I was wondering what kind of device would I need to use to achieve this? And how would I connect it up to the microcontroller? I'm fairly new to this, so if someone could...

Why does a turbine in an energy plant experience more resistance if the electrical load on the other end increases (electrical resistance decreases)? What I don't understand is how the force that drives for instance a washing machine gets through the power lines that don't seem to experience...

Hello Please give me some advice on a lot my wife and 2 kids are thinking on building our home on in SC. It will be located next to a large power line right of way. Its near a lake so we have those big metal towers. I'd say the nearest tower from my house will be like 50 to 75 yards. I took a...

Hi...Here is a GIF of some electrical explosions that I recorded with my full spectrum camera. These power lines supply power to a neighboring county so it didn't affect my area. In the upper atmosphere we see something similar in Transient Luminous Events (TLEs). In the case of the blue in Blue...

So I was messing with the induction from power lines and fluorescent bulbs, and I noticed all the plants under the power lines were dead but plants around it were fine. Do EMF's have something to do with this?

Has anyone got a good link to a guide to UK power lines? I hate looking up and not knowing what's there. For example, my house has several poles leading to it, strung with one live 240V and one neutral, the latter being tapped to Earth at each pole. What if there are two lines, strung...

Hi there, If I'm using the equation P_loss = P^2 * R / V^2 to calculation the power lost on a cable, where R = p(resistivity) * L(length) / A(cross sectional area), then how long is this power loss for exactly? Thanks, Sydney

Ok, so the title was pretty vague, I'm not sure how to succinctly describe the confusion. Anyway, so I've learned that the power lost is P=I2R, and so by increasing the voltage, as P=VI and is constant, the current will be lowered, and thus the power lost will decrease. I'm confused about a...

I’m confused: Long distance electric power lines are modeled with distributed impedance and are therefore modeled as transmission lines. Long distance electric power lines are considered to be a two wire line (for a single phase of the electric power line anyway). What other types of...

Hi, I have a question concerning the use of aluminium in power lines. I know that it's lighter than copper and thus cheaper, which is the main reason we prefer it above copper. But in fact alumunium has a lower conductivity than copper. Why is it then that one kg of aluminium can carry twice...

It just occurred to me that akin to electric power lines, which in the end just connect a voltage differential over a long distance and facilitate power exchange between the two end points, one could build "thermal power lines". That is, a well-insulated cable that internally consists of a...

I've been doing some bedtime reading in Chabay & Sherwood's Matter & Interactions textbook (https://www.amazon.com/gp/product/0470503475/?tag=pfamazon01-20) and have come across some interesting tidbits. Here they are: I've always pictured electrons pushing each other through a wire, kind of...

Hello to all of you. I have the following case to solve. I have three overhead power line towers. The first and the third are with tension insulator strings, and the second is with suspension insulator string. During the design process i noticed that the second tower is located incorrectly and...

Hello dears i want to know which is best for 132kv transmission line. advantages and disadvantages as in prectical use. but also consider economical factor wisely . what you chose if you are in my place... ACSR Conventional AAAC ( All Aluminium Alloy Conductors ) ACCC Aluminum Conductor...

Homework Statement You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that the two wires run about 30 m above the ground and about 2.9 m apart. A call to the local power company provides the information that the lines operate at 10 kV...

From textbook: "In much of the world (Europe, Australia, Asia) the rms voltage is 240 V, so the peak voltage is 340 V. The line voltage can vary, depending on the total load; the frequency of 60 Hz or 50 Hz, however, remains extremely steady" Why is it so important to keep it steady? what...

Hey everyone, This is quite a simple question, I think I'm just getting confused. 1. Homework Statement Given Data: Merlin: Resistance: 2 Ω / km, Maximum Current: 519 Pelican: Resistance: 1.5Ω/km, Maximum Current: 646 Penguin: Resistance: 4 Ω/km, Maximum Current: 357 Sparrow: Resistance...

Hello Forum, It is well known that the electrical power dissipated (in the form of heat) by a resistor of resistance R connected to a battery of voltage V is: P_diss = (V^2)/ R or equivalently P= (I^2)*(R) Clearly the smaller the resistance R, the more the dissipated power because R is at...

Homework Statement A conductive ball of diameter 0.4 [m] is charged equally with a concentration of \sigma=8 [micro-coulon/m^2]. What's the total number of electric field power lines, N, that extrude from the ball Homework Equations The electric field near a conductor is like in a capacitor...

Homework Statement A small power plant produces a voltage of 6.0 kV and 150 A. The voltage is stepped up to 240 kV by the transformer before it is transmitted to a substation. The resistance of the transmission line between the power plants and the substation is 75 Ohms. What percentage...

Electric current -- High voltage power lines buzzing Question: High voltage power lines string along roads often give off a faint buzzing sound. Use what you know about the motor principle to explain the source buzzing. ok, so i have no idea how to approach this. I've never heard...

Hello learned Engineers, Physicists, and people more useful than myself: Thank you in advance for reading. I would like to submit a more educated proposal to a utility company for a method that would allow it to install 500 kilovolt renewable power transmission lines through many residential...

Ok so I have read that power lines carry very high voltage to minimize loss through resistance, but when I take a look at the formula E=IxR E=Voltage I=Current R=Resistance Divide both sides to get E/I=R To minimize R we should make the numerator of the quotient smaller, and the...

I am having trouble understanding how a circuit is completed from the AC power plants over the high voltage power lines. In order for current to flow there must be a "neutral" conductor. I can only conclude that the ground is used somehow to make this current flow. In contrast, the wires...

I have a property with a 3 phase underground power line. The power line doesn't go near the house but happens to pass directly underneath the shed, which is in the form of a sea container. Whenever I'm working inside the container, I feel sick. The symptoms are similar to those described by...

Imagine a circuit with a cell and no resistors. If I connected a resistor to two points in the circuit, would a current flow through it? Does a bird on a power line act like this? Why does it not get electrocuted? Sorry if this is a stupid question - I'm terrible with electronics! :blushing:

How are power lines connected over canyons? Are they simply laid out on the canyon floor and then hoisted up and stretched to the towers? Just wondering. Thanks.

Downed power line kills 3 in San Bernardino I wonder if there's a special place in hell for those that make puns at the expense of people dying in a horrible accident.

Homework Statement You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that a transmission wire is about 25 m above the ground. The local power company tells you that the line operates a 12 kV and provide a maximum of 47 MW to the local...

So i know the whole picture starting from power from the generating plants that go all the way to our homes..and the ground serves as a return path to complete the circuit..What i don't get is...how does that current find its way back to the source through ground?..is the source somehow...

so the reason why alternating current is used to deliver energy to households is because for a given wire, the voltage drop is always less with ac rather than dc right? but when i calculate the voltage drop it coumes out to be the same! v=IR R=P(length of wire)/(cross section area of wire) i...

Homework Statement We know that current will flow whenever there is a potential difference. Sometimes when there are problems with high voltage lines - workers must work on them 'live' (not shut down). How do the workers manage to work on the wires without getting electrocuted by the high...

If the electric field at a point drops off in intensity as the inverse ratio of the square of distance from the source, how do power lines manage to carry current through such large distances?

I've long understood that voltage is stepped-up in power t-lines to decrease losses, however, I've never really understood the math reasoning behind it. Isn't P = V^2/R the same as P = I^2*R? If so, it seems that either increasing V or increasing I would invoke the same losses... Could...

I have a physics question that I'm hoping someone has enough free time and is intrigued enough to figure out for me! My sister just bought a house which is near some high voltage power lines. I've heard that people living near these types of lines can sometimes induce a current in wires...

I've never found any conclusive evidence suggesting that it does. Have there been any independant studies conducted?

Why is it that two power lines carrying anti parallel currents exert force away from each other as oppose to to each other?

What is the proper way to connect several ac power lines into one line. So let's say if you had 20 lines and each had a 10 volts and 1 amp of power so 10 watts AC. When connecting them into one line would you have 200 watts. Also with it being alternating what would happen when the current is in...

Homework Statement Well I just want to make sure I am right on this one. The question is how to steal electricity by placing a coil near a power line that carries alternating current in which the current varies sinusoidally. A.) For a single wire how should the coil be oriented to induce the...

[b]3. The Attempt at a Solution [/b Maybe because charge passes through the powerlines and doesn't stay at one spot?

when workers work on transimssion lines, they first use a rod to energerize themselves to avoid getting shock. But how come a bird doesn't get shock when it sits on the line without safely energizing itself first? Does current from transmission line flow to the helicopter when it is in the...