Maybe you could get and rig something at point of entry with the marker dye that banks use for money bags or something of that sort? If the visits are nocturnal caltrops may help.
Go Indiana Jones style and setup some booby traps. Put something expensive on a plate which sets off a huge boulder which rolls into the room when the item is lifted. Or have the doors lock and the walls slowly push inward, ending in a crushing death. If the expensive item doesn't attract attention, then throw some chicken on the plate. Maybe a bottle of Tanduay.
Resistance is akin to friction for electricity. The more resistance the more heat, heat is a loss of power. Loss of power =$$. V=IR As for an electric fence to draw "nothing", that is impossible......in the world we live in (not a science lab) there are no superconductors. Everything, including the most efficient conductors, have resistance. I suspect that barbed wire, made out of stainless steel, offers some high resistance.
You got your Ohms law there. But what is I in this case? Anything times 0 = 0 If you had to drive anything at the end of the wire, e.g. a light bulb, you would have a very inefficient circuit, with loss of power in the wire. But, this is an open circuit, with no draw at all. Air got even higher resistance than barbed wire, so then any receptacle will always draw lots of electricity. (In this case I ignore the fact the barbed wire will in fact work as a capacitor, and as we deal with AC, we will loose a very small amount of electricity, but here we talk some single pesos per month)
I have know a guy in most every city/municipality in the area that has had a break in. Some even had a guard on duty when the break in happen. My landlord is awesome, it's a nice place with a swimming pool, mostly quiet neighborhood and not that expensive. Solve this break in problem and I have absolutely no issues living here.
Let me put on my thinking cap here. Been awhile since I've done this. V=voltage I=current R=resistance Let's assume 220 volts and let's assume that the razor wire will be a good quality stainless steel (very unlikely here). Stainless steel has a resistance of 720 ρ*(nΩ*m), forget factoring in temperature because I'm just not smart enough to do the math. Steel, specifically stainless steel, is just not a good conductor Fill in the variables and you come out with 0.305 amps. Given the low quality steel here, plants that will inevitably touch the wire and rust that will be present after about one week your resistance will be much higher. The higher the resistance the higher the amperage. More amperage=more heat=more chance of fire. I could be way off here but this is my understanding of how conductors work. Resistance=$$
If I found some barbed wire made of pure silver it might be electrically efficient......but very expensive.
You are absolutely right, if it was a closed loop. But it isn't. The barb wire isn't connected between live and zero. It's only connected to live, with the ground (e.g. wall) being 0, and anyone touching the wire closing the loop. (So, theoretically there is a load as long as someone is touching the wire and ground at the same time, but lets hope that's not the case) What you have is an open loop, so resistance is virtually infinite. So 220v / infinte Ohm = 0 Amps And your assumption that higher resistance = higher amps is wrong. Try putting a higher number on R in the equation and you will see that I goes down. With unlimited R the I will be 0.
In an open loop, no difference what material you use. In a closed circuit, silver will draw more than steel, due to lower resistance. I = U / R, lower R=>Higher I, given U is fixed as 230v.
Ok. Agreed. Sorry it took me a while to catch on. No electricity is being "pushed" so resistance is irrelevant. I would suspect that trees/leaves/branches/dead rats/dead thieves (aka dead rats) going unnoticed and completing the circuit could cause a fire....and large electricity bills. Rain could cause some major sparking issues as well. Electrifying anything not meant to be electrified seems like a bad idea. A proper electric fence is going to have some safety devices to stop fires/death from occurring. I would rather spend a bit more for the safety aspect.
