Re: [OT] jumpstarting takes a few minutes of "charging"? by Mark Hanchey .

On 5/16/2012 8:55 PM, Sean Breheny wrote: > I agree, Bob. The resistance of good clamps on fairly clean metal is > going to be maybe 1 or 2 milliohms per connection. This would be 8 > milliohms max for the entire circuit. The resistance is not the problem, it is the small surface area making the connection on both ends. The clamps on most cables have very small contact area with the terminals. It would not surprise me if the contact area was equal to that of a 10AWG wire. The resistance may read as 0 but that will change when the metal begins to heat up from a lack of being able to handle the high currents. It is like trying to power a home using a needle at the end of the service wire and expecting all 200 amps to flow across the needles contact point. Mark