![]() ![]() This then lead to a very important law linking electricity with magnetism, Faraday’s Law of Electromagnetic Induction. ![]() So what Michael Faraday discovered was a way of producing an electrical current in a circuit by using only the force of a magnetic field and not batteries. Faraday noticed that when he moved a permanent magnet in and out of a coil or a single loop of wire it induced an Electro Motive Force or emf, in other words a Voltage, and therefore a current was produced. Then by either moving the wire or changing the magnetic field we can induce a voltage and current within the coil and this process is known as Electromagnetic Induction and is the basic principle of operation of transformers, motors and generators.Įlectromagnetic Induction was first discovered way back in the 1830’s by Michael Faraday. Likewise, if we kept the bar magnet stationary and moved the coil back and forth within the magnetic field an electric current would be induced in the coil. By moving this bar magnet “in” and “out” of the coil a current would be induced into the coil by the physical movement of the magnetic flux inside it. With more turns of wire within the coil, the greater the strength of the static magnetic field around it.īut what if we reversed this idea by disconnecting the electrical current from the coil and instead of a hollow core we placed a bar magnet inside the core of the coil of wire. Therefore, the magnetic field strength of a coil is determined by the ampere turns of the coil. ![]()
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