OH MY GOD!! Check this out. I just learned about some tank armor designed by the British (but obviously secretly intended for KILLER ROBOTS!!) formed in layers that uses an electrically grounded bullet proof exterior followed by an insulating core and a powerfully charged interior layer. So if anything penetrates the armor it completes the curcuit and WHOOSH!! Vaporizes!! Here is an excerpt from an article on it...
The new electric armour is made up of a highly-charged capacitor that is connected to two separate metal plates on the tank's exterior. The outer plate, which is bullet-proof and made from an unspecified alloy, is earthed while the insulated inner plate is live.
The electric armour runs off the tank's own power supply. When the tank commander feels he is in a dangerous area, he simply switches on the current to the inner plate.
When the warhead fires its jet of molten copper, it penetrates both the outer plate and the insulation of the inner plate. This makes a connection and thousands of amps of electricity vaporises most of the molten copper. The rest of the copper is dispersed harmlessly against the vehicle's hull.
But despite the high charge, the electrical load on the battery is no more than that caused by starting the engine on a cold morning.
In a recent demonstration of the electric armour for senior Army officers, an APC protected by the new British system survived repeated attacks by rocket-propelled grenades that would normally have destroyed it several times over.
Many of the grenades were fired from point-blank range but the only damage to the APC was cosmetic. The vehicle was driven away under its own power.
This seems surprisingly low tech. Two sheets of metal separated by an insulating layer and a big freaking capacitor. Heck, if it weren't for my biologically derived survival instinct, I might try to make some of this stuff at home
. And once your killer robot has this armor, why even bother attacking your opponent? Let him attack you and get his sorry butt vaporized. Now THAT would make for some damned good TV.