Sorry but barbed wire for predator protection is a waste. As some other said, it will not phase them. Many of us have grown up around barbed wire. It is used to keep certain animals in. It will not phase a predator and it will not phase your chickens. Your chickens will go right through it.
Electric wire or netting works great to keep predators out as long as it is maintained. They touch it, figure it is made out of raw lightning, and want nothing to do with it.
Chickens can walk through electric fencing if the holes are big enough. Their feathers so insulate them. If they touch it with their combs or wattles they will get a shock. They tend to learn to not do that too often. I use electric netting to keep my chickens in and land based predators out. It doesn’t do much for hawks or owls.
The electric current is not a steady current. It pulses, sending out a very brief current about 50 times a minute. If it were a steady current it would be dangerous and we would not be using it. If the current is steady you can’t turn loose. Since it pulses that gives the animal or us a chance to turn loose. Trust me, if you ever touch it, you will turn loose.
A few days ago I saw a hen pick a grasshopper off my electric netting. She obviously touched the netting with her comb or wattles just as it pulsed. She jumped back and up a few feet and squawked, then went about her business not hurt at all. She kept the grasshopper by the way.