Lightning/Sparks

[5614]

we all know lightning does not strike in straight lines, it zig-zags around.... why is this?

 

is it because of variable composition in the air? like one part will have less resistance so it'll take a d-tour via that part or what?

if that was the case surely the additional distance travelled would counteract this lower resistance and thus remove the advantage of the taking that route?

 

(once i get an answer to that i've got a question on sparks too!)

[Lance]

I would guess that its the variable resistance. Keep in mind that wind can also affect the resistance.

[5614]

ok, in that case can somone go through ALL the steps that happen when a spark occurs?

 

like including, high potential difference, ionisation of air (causing decreased air resistance), flow of electrons.

 

i think i know it, but i have a problem with it, so i'll ask that first, and then ask my 2nd question after!

[YT2095]

most of all lightening occurs in the clouds and only a small 10% or less actualy ever reaches earth, and then it strikes from the earth upwards after a "Feeler" is sent.

 

then as mentioned, electricity will take the path of least resistance, and that path may not ALWAYS be a straight line

[coquina]

http://www.publicaffairs.noaa.gov/grounders/lightningsafety.html

 

 

How Lightning Works

Lightning is caused by the attraction between positive and negative charges in the atmosphere, resulting in the buildup and discharge of electrical energy. This rapid heating and cooling of the air produces the shock wave that results in thunder. During a storm, raindrops can acquire extra electrons, which are negatively charged. These surplus electrons seek out a positive charge from the ground. As they flow from the clouds, they knock other electrons free, creating a conductive path. This path follows a zigzag shape that jumps between randomly distributed clumps of charged particles in the air. When the two charges connect, current surges through that jagged path, creating the lightning bolt.

 

[5614]

ok, thanks guys, just to repeat the question so it isnt 'lost':

 

can somone go through ALL the steps that happen when a spark occurs?

 

like including, high potential difference, ionisation of air (causing decreased air resistance), flow of electrons. (and anything else, i just made that lot up)

 

i think i know it, but i have a problem with it, so i'll ask that first, and then ask my 2nd question after!

[ed84c]

i dont see why not. There arnt any 'random' influences in this case, if thats what you mean.