Monday, February 8, 2010
Why are birds able to perch on power lines without being electrocuted?
The reason is because...
for current to flow in the birds body, it needs a live and a neutral conductor.Secondly the circuit needs to be complete.When the bird is resting on the cable, which is live, cant be electrocuted simply because the circuit is not complete.The birds body will become charged for a short period. Should the bird make a wrong move like - while resting on the cable, let its tail feathers touch the second parallel cable, it will be instantly killed by the lethal current.Both lines being live will result in a short-circuit and the birds body will receive a large current.To reduce this transmission lines are spaced well enough for the birds.It is then safe to say that when you touch any of the cables and not be stepping on the ground (Earth), you may not be electrocuted.That's why a squirrel can run across an electrical line, but sadly die when its foot makes contact with the (grounded) transformer on the pole at wire's end.You may want to try at your own risk.
at 7:05 PM