Electromagnetic induction is all around us.Even at this moment, as you read these lines from the screen of your electronic device on the cells of the body are affected.However, this experience is not necessary, because its intensity is so small that is only of theoretical interest.However, under certain conditions, the electromagnetic induction can be increased up to dangerous levels.As you know, human security depends primarily on himself.Therefore, you must have at least a general idea of what is electromagnetic induction.
Let's put a simple thought experiment.For this we need the metal ring-hoop, in which the gap has consistently included a sensitive ammeter and low-power light bulbs.This ring will be closed loop through which can flow an alternating electric current.The ring itself is isolated, for example, is nestled in a plastic jacket.The second essential element - a long wire through which the current flows.The voltage should be raised here.Place a hoop in one room, and a wire - in the other.Obviously, the current meter in a metal ring will show zero - indeed, it will be taken from the current ?!Now put the wire directly to the ring ... At this point, if the voltage is not too small, needle deviates from zero.Miracles!For electrons with the wires can not jump on the metal ring, as the last thing we particularly pointed isolated non-conductive plastic.Let's complicate our experiment: Wind the wire on the hoop.Now arrow ammeter clearly indicates the presence of a ring of electric current.The reason for this - electromagnetic induction.To explain what is happening from a scientific point of view, it is necessary to make a small excursion into history.
discovery of electromagnetic induction in 1831 is attributed to Michael Faraday.Ten years before that, he set out to convert the magnetic field into electrical energy and, apparently, cope with it brilliantly.Already while physicists been known that there are two types of fields - magnetic and electric.If the carriers are moved, the recorded magnetic field of nature, and if you are immobile, the electrostatic.Many people assumed that the margins should be somehow linked, but confirming this practical experience and made it his study Faraday.He moved a smaller within the larger coil.The findings of one of them were connected to a meter, and the other on coils of constant current.The emergence of the particle motion in the circuit called induced (induced) current.If you have charged particles move directionally, that appears around a magnetic field.To occurred induction, the line tension of the field to cross the conductive circuit.Can he move like a contour, and the field - the result is the same.Replacement DC (Faraday's experience) to alternating avoids any mechanical movement, as generated by the field itself changes over time.Application of electromagnetic induction possible to create electrical power transformers.Perhaps electrical would never have reached the heights of today, do not be such devices.
What is the danger to humans?Some power lines transmit thousands of volts.Because of this, the existing field around the wires may extend a few meters.The man caught in a variable field, the water molecules are oriented along the lines of tension.Prolonged exposure to these conditions adversely affects many body systems.
