Minimum Voltage and Current for Electric Arc at One Inch Distance

[force]

What would be the minimum direct or alternating voltage and current needed to produce an electric arc in air at a distance of one inch ?

 

[ZapperZ]

What would be the minimum direct or alternating voltage and current needed to produce an electric arc in air at a distance of one inch ?

The ballpark figure that is often quoted is of the order of 10^6 V/m. So you can scale that for whatever distance you want.

http://hypertextbook.com/facts/2000/AliceHong.shtml

Zz.