Electric shock

theinfamousbob

Member

• Oct 26, 2005

• #21

good point...thank goodness im on 120vac

 

zachtheterrible

Active Member

• Oct 26, 2005

• #22

On the 12v battery I get arcs that are actually 1-2mm. Not just sparks. If I put my finger next to one of the terminals I will even get shocked. Kind of painful too. Weird huh?

Yes, sparks emit a lot of UV. I was fiddling around with my jacob's ladder and noticed that when there was an arc, the schematics pinned up on my wall were glowing as if I had a blacklight on them :lol:

 

Someone Electro

New Member

• Oct 27, 2005

• #23

An arc is wen the air gets ionised and starts conducting curent.

So to arc 2 mm you wod need about 2000V!!!That is to start the arc.And there is no way an car batery is going to do that.

So if you have 2000V the arc shot start wen the contacts are less than 2 mm a part

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Oct 27, 2005

• #24

Someone Electro said:

So to arc 2 mm you wod need about 2000V!!!That is to start the arc.And there is no way an car batery is going to do that.

Click to expand...

The arc from a car battery is when you disconnect it!, it tries to keep the current flowing, producing a small arc. This happens with switches and relay contacts as well, and is why they have a higher AC current rating than their DC one (because with AC the spark will automatically stop as the current falls to zero).

BTW, the value I've always used is 10,000V per cm (which is the same thing obviously), but this is in dry air - in damp air it takes considerably less.

 

M

madmikejt12

New Member

• Nov 4, 2005

• #25

ive been electricuted from a telephone wire in the house, i was fixing it for my nan and i got a shock and jumped off the ladder, it felt quite good actualy :lol: my finger was damp at the time....
does anyone know what voltage they are in the uk? (indoor telephone wire)

 

Someone Electro

New Member

• Nov 4, 2005

• #26

Someome has probobly called you.Becose to make the tlephone ring a high volatge is sen along the line.

I dont know exsactly what volatge .It is its soemware betwen 40-90 V

 

J

Jay.slovak

Active Member

• Nov 4, 2005

• #27

It should be arround 48V.
I got electricuted by telephone wires too, it has a lot of juice :lol:
I respect them since then.

 

akg

New Member

• Nov 4, 2005

• #28

normal telephone line voltage is 48-52v DC but during ring it will go around 75v AC .. that's when ur hair responds :lol:

 

Someone Electro

New Member

• Nov 4, 2005

• #29

I heard that an dogs chain got someohow shorted on the telephone line and broke conection whith the telephone.So wen the phone shod ring the dog started barking.And wen he pead then the dog got a beter conecton whith the ground and the telephone got enugh curent to ring.So they ware them wondring why dose the dog bark befor the telephone rings.And soemitnes it dosent ring.

 

Dr.EM

New Member

• Nov 4, 2005

• #30

I've heard that story before, almost forgotten about it though :lol:

 

M

madmikejt12

New Member

• Nov 4, 2005

• #31

yeh so have i, the woman apparently called someone in because she thaught her dog was psycic