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Questions tagged [lightning]

The tag has no usage guidance, but it has a tag wiki.

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Electricity and light bulbs [closed]

Kindly say if I am right? Case1: Current flow and light from an incandescent bulb. Reason for light due to current flow: Tungsten is an insulator (comparatively) so when sufficiently high ...
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1answer
34 views

Why and how fast does lightning propagate?

While looking at this youtube video of lightning in 1000 fps I was somewhat surprised that such a frame rate is enough to capture the propagation of lightning. I have no clue about photography of ...
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0answers
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How do scientists determine the width a thunderbolt?

As I searched on the internet, I found a website stating that the width of a typical lightening strike is $2.5~$cm wide and $8$ km long. I intuitively understand that scientists can measure the length ...
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1answer
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What would happen if lightning struck a salt deposit?

I'm not familiar with the formulae involved in lightning discharge, so please bear with me here. As far as I'm aware, lightning (that is, cloud-to-ground lightning) tends to do one of three things, ...
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1answer
44 views

Can lightning bend metal?

If lightning strikes a metal pole, will it bend because of the force exerted by Earth's magnetic field on the current?
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1answer
25 views

Why is the inductance of ionized air similar to inductance of wire?

Why is inductance of wire which is about 1 microHenry per meter similar to the inductance of air broken down by lightning (where the high voltage of a lightning strike breaks air down and it becomes a ...
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1answer
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How do lightnings have matter but light doesn’t?

if lightning is plasma which is a state of matter that means that lightnings have matter. but light is electromagnetic radiation and doesn’t have matter? can someone please explain? thanks
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3answers
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Can a lightning which doesnt make light be made?

I was wondering if there is a way to make a lightning (lab lightning, nothing as chaotic as the real thing) that doesnt eject any electromagnetic waves? For example: How would a strong negative magnet ...
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1answer
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For a building on a slope, should the earthed (grounded) lightning protection be downhill or uphill from the structure? [closed]

Would it be best to place the earth protection (the copper spike) for a building on a slope downhill (A) or uphill (B) from the structure? Assume that lightning is most likely to strike at (C), the ...
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0answers
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Do Multiple Localized Turns In a Helical Lightning Path Collapse To a Toroidal Plasma?

Lightning carries around 25,000A of current, so if the conductive path has kinks in it, the magnetic force on the plasma will be rather large and tend to produce a kink instability. The duration of a ...
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2answers
69 views

How large of a capacitor is needed to hold 5,000,000,000 J? [closed]

Given today's technology, what size of capacitor (in farads and physical size) would be required to hold 5,000,000,000 J of energy, the estimate for the amount of energy in the average lightning bolt?
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4answers
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Car hit by a lightning strike

In Griffiths' Introduction to Electrodynamics, at the Electrostatics chapter, in particular, in the conductors section, he says this after the stating that within an empty cavity surrounded by a ...
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1answer
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How do bulk regions of clouds conduct charges into a lightning bolt?

It's easy to find explanations of the theories of charge accumulation in clouds during storms, as well as ones describing suspected processes leading to lightning channel formation. What I have yet to ...
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3answers
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Is it possible for a lightning strike to hit the ground if there are high rise buildings nearby?

Say we have pointed conductors connected to the top of the high rise buildings. Will the strikes hit the nearby ground in such a case?
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2answers
87 views

Does lightning have pressure?

Hi do lightning have pressure if yes what is it ? Nikola tesla has invented the artificial lightning so can we make it ?
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3answers
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What determines the shape of lightning? [duplicate]

Everyone's seen lightning streaks, either in real life or in pictures and videos. My question is, why does it look the way it does? Does lightning spread in a random manner, or is there physics ...
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1answer
36 views

Reference frame(s) for return stroke of lightning bolts

A lightning bolt consists of two processes, one of them is slow -- the forward stroke, the other occurs at around a third of the speed of light $c$. Each little part of the lightning bolt looks kind ...
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1answer
64 views

Lightning strike on aircraft

Is an electromagnetic pulse sufficient to account for the complete dscharge of an aircraft struck by lightning?
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0answers
42 views

Why does Lightning have branches? [duplicate]

Why does lightning have branches? A straight line from the clouds to the ground should be the path of least resistance, then why does it branch out? If it is because of different gases present in air ...
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2answers
112 views

Why photon and electrons travel at same speed in thunder

They say light travels faster than sound. Lightning is just electrons, right? Then why are both electrons and photons traveling at the same speed when thunder storms occur?
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2answers
145 views

Is the speed of sound constant?

I was looking at lightning, and started to wonder if the speed of the thunder slowed down as it lost energy traveling far distances. I know the amplitude of sound decreases, perceived as volume. Im ...
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2answers
35 views

Lightning vs series of resistors

So I was wondering if, theoretically, can a series of resistors kill off lightning current or make it low enough to sustain a battery?
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1answer
93 views

Why sound is produced during lightning? [duplicate]

During lightning ,both light and sound is produced . I want to know why light and sound is produced?
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2answers
116 views

Is lightening a form of alternating or direct current? [closed]

Is lightening a form of alternating or direct current? I have no idea about this, so help me.
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2answers
169 views

Spark Length in Air vs. DC Voltage

How can I calculate the potential difference (in DC) needed to create an electric spark of a specific length (between 0-5mm) in air? The sparks are observed between 2.5cm metal spheres. Is there a ...
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3answers
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Tree vs lightning rod: why does one burn and the other not?

I have this simple question, but I cannot find the answer. I saw this video about a plane getting hit by lightning. In it, Captain Joe explains why people do not get electrocuted. This has a simple ...
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2answers
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Why do many animals die at the same time when lighting hits surroundings?

I have been reading about many cases in history of lighting striking and killing dozens even hundreds of animals, to be more specific quadruples, at the same time. Apparently this doesn't happen with ...
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2answers
394 views

Lightning on Burj Khalifa

Does Burj Khalifa, being the tallest building and the best route for lightning, experience most lightning? I suppose lightning in a radius around Burj Khalifa would only fall on it and nowhere else. ...
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2answers
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Does the lumen value of a light bulb take into account the inverse square law and volume of a room?

For example, I am trying to calculate the number of 800lm light bulbs required to light a 16sq meter bed room with a 2.5m celling that doubles as a study. Assuming 75 lux is required, this converts to ...
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1answer
837 views

How do electrons move in a lightning strike? [duplicate]

I know that a common lightning strike is an electric current and I believe air has high electrical resistance comparatively, detail is not important however I think friction caused a build up of ...
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3answers
2k views

Can Special Relativity hold even without motion?

I am having a bit of confusion, let us say there are two observers observing two simultaneous lightning strikes with a finite distance between them. Now one observer is located such that he is in ...
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1answer
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Is a lightening strike deterministic?

This relates to a previous question: Is a dice roll deterministic? Essentially, I'm trying to get a better understanding of how quantum indeterminacy interacts with the macro world. It seems to me ...
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2answers
315 views

How much power in a lightning strike?

The Biblical story of 1 Kings 18:20-40 relates how a lightning strike ignited a bulls carcass, as well as a wood pyre, both of which had been thoroughly wetted with abundant water. Is there enough ...
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1answer
163 views

Is wearing an insulated metal armor against a lightning safe?

Related: Is wearing metal armor during lightning safe? only partially answer my question. During a discussion in my question in Worldbuilding, this answer explain that as long as the metal armor is ...
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1answer
291 views

Noise heard simultaneously with lightning

During a recent thunderstorm in an urban area, I saw lightning strike within about half a mile, estimated as such because I heard the thunder about 2 seconds after I saw the strike. What surprised me ...
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2answers
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At what temperature do the laws of physics break down?

I heard that as approaching the temperature of a kugelblitz the laws of physics break down, I saw this in the video The Kugelblitz: A Black Hole Made From Light, by SciSchow Space.
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1answer
130 views

Lightning plasma density

According to [1], the plasma produced by lightning has a temperature ~ 28,000 K, and an electron density ~ $10^{24} / \rm m^3$. What is the density of the plasma in $\rm kg / m^3$? [1] https://www....
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1answer
36 views

Electric charges

It is known that why we see a small bit of lightning or an electrostatic shock is when placing a negatively charged conductor to a neutral conductor, isn't it? My question is why do feel hurt or ...
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1answer
573 views

What is 'arcing' at switch contacts in LR circuits when current changes instantaneously?

I am studying from Neil Storey's Electronics book and I can't understand the following paragraph: "We know that the current stabilises at a value of V/R. If the switch is now opened, this would ...
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1answer
82 views

lightning ground rod

I have a quick question about lightning ground rods. We had a Kohler generator large enough to power most of the house installed for my 82 year old mother. The installer ran the line connecting it to ...
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1answer
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How is the current of a lightning strike traveling a few times through the same channel?

Look at this video: Lightning travelling through the same channel It's clearly visible that some lightning strikes travel through the same channel more than once because the path has the less ...
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2answers
886 views

Could you use magnetic fields to direct a bolt of lightning?

Would it be possible to direct the flow of electrons in a lightning bolt in a certain direction, using magnetic fields? Furthermore, would it be possible to direct the lightning in a long straight ...
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1answer
356 views

How does static electricity produced in blizzards?

I've read that in strong blizzards static electricity can occur and even produce lightning. How friction between snowflakes can create distribution of electrical charge?
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0answers
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How friction between water and ice creates distribute charge in the cloud? [duplicate]

I've search in Google answer for it, but no one knows. Usually people say that when ice particles collide with water droplets, they get different charge. Small light particles get positive charge and ...
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1answer
91 views

why does lightning always come from the clouds?

I read in my school textbook that lightning strikes the ground because the buildings or trees gets charged by induction.so why dosent the static discharge go from the ground to the clouds?
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3answers
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lightnings and thunders [duplicate]

If I see a lightning I must wait many seconds to hear the thunder because of the different velocity of light and sound in the air. This is true, I think. But why thunders lasts 1-2 second and the ...
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3answers
7k views

How does a Faraday Cage work?

I was reading some articles about lightning and i came across the term "Faraday cage". I know that it refers to an enclosure made out of a conductor that can block electric fields. But what i want to ...
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1answer
100 views

Can rails on the ground or blimps in the air be positioned to collect lightning?

This question was inspired by Ben Franklin key on a kite string. There's A Place On Earth That Experiences 1.2 Million Lighting Strikes A Year. In a small area of northwestern Venezuela, where the ...
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1answer
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Should I be concerned about lightning hitting my balcony antennas?

I want to put three antennas on my balcony (first floor, separate building): two for LTE connection (1800/1900 MHz, if that matters) and one for ADS-B capture (1090 MHz). Should I be afraid (...
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2answers
2k views

Can lightning happen in a vacuum?

Can lightning occur in space artificially? Can lightning channel along a laser or proton beam in space?