OK, lets be conservative and say 400A ran at 120v till the conductive circuit, [ ie metal, plasma arc, etc. ] disrupted itself, and ignoring any voltage drop. Say for 100 milliseconds?

Energy = 400Ax120V= 48,000W. @ 100m/s = 0.0013kWh power.

That’s enough to practically instantaneously make a cubic inch of superheated steam at over 2000 psi gauge.

Alan

Wood work but can't!