Souplex said:
There are several million threads about surviving a zombie apocalypse, but I haven't really seen any about surviving a robot uprising. How would you?
(Note: Before everyone shouts EMP! know that magnetic shielding exists and you would also need a reasonable method of obtaining one)
Shielding exists but like any defensive technology of the last half-millenia it remains at a disadvantage.
EMP works thanks to a remarkable feature of a conductive material and an electro-magnetic field. Simply put, if a conductor is in an EM field, it is possible that a current is produced. Since most electronics operate based largely on the principle of well controled voltage levels and wahtnot, introducing additional current can often damage or destroy a circuit (the smaller the circuit the lower the tolerance for changes, at least generally).
Shielding essentially comes in two flavors. The first, is the use of non-conductive shielding across the circuit. Most will have noticed that your average wire has a non-conductive covering, and while it's primary purpose is to control voltage flow it does provide a measure of defense against an EM field. The second mechanism is a method of control re-direction of the excess voltage. This latter way takes a number of forms, from a simple conductor placed around the actual wire itself (shielded Cat-5 cable demonstrates this) to a complex system built into the curcuit itself. Such means only increase the margin of failure however, and there is always a strength of EM field that will bypass any type of shielding.
Producing the EM field would probably prove the tricker bit. While it is, in fact, increadbly easy to generate a suitable EM field (just rotate a magnet for example. In fact, most power produced works on the prinicple of a magnet rotating inside a coil of wire), the strength is the key. While any electrical device produced an EM field, producing a field strong enough to actually do damage is quite difficult. The best examples of a probable effective EMP come courtesy of nuclear weapons, who generate an enormous emoung of energy along the entire electro-magnetic spectrum.
The most effective application against robots would likely leverage the cocnept of nuclear magnetic resonance. Simply put, if one can determine the resonance frequency of a critical circuit in a robot (which is a function of the material used in the creation of said circuit) one can generate a pulsing magnetic field that meets said resonance (essentially, all one needs is a few capacitors and a conductive coil). The problem here is, unfortuantely, power. While such a device could be activated "on command" one of the properties of magnetism is that it diminishes rapidly across a distance and as such would require significant power to affect a target over a long distance. There are ways to maximize a return, and the progress in super-conductor technology would prove most promising. Generally speaking, a material becomes super conductive at very low temperatures, but if a material can be super conductive at a temperature that is easier to reach and maintin, effecience would increase (since one wouldn't lose as much energy to heat). The volatage requirements at the target end along with a presumed range and knowledge of frequence could be used as the basis for a design. If the voltage fluctuation needed is low and brief, the device could probably be built readily and be put into production quickly. The biggest advantage of such a system is simply that magnetism is impossible to shield against (though the inclusion of a large quantity of conductive material of the given resonance would likely serve to a limited effect).
Other than that, simply remember that these robots must still use normal materials. Even if made out of the strongest materials known to man, there are weapons that would have an effect. An inch-thick plate of armor grade steel will only stop a .50 caliber machine gun round at 200+ meters for example. It takes several feet of armor to stop a 120mm sabot round fired from an American M1 at 1,500 meters. While robots would likley have an avantage over crewed vehicles and the like (in that they could reasonably sustain more damge without being completely inoperable - it's easier to kill a driver than halt an engine for example), we would have an avantage in numbers in the beginning at least. A robot army would still have supply lines and factories to bomb and would still have to follow the same principles of warfare that any nation faces so fighting them in a conventional fashion would certainly be possible in the beginning stages while specific weapons were developed.