Electro Magnetic Induction

• Electro Magnetic Induction Was first discovered way back in 1830's by Michael Faraday
• Faraday noticed that when he moved a permanent magnet in and out of a coil or a single loop of wire it induced an emf, in other words a Voltage
• 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.
• This then led to a very important law linking electricity with magnetism, Faraday’s Law of Electromagnetic Induction.
• Magnetic fields are produced by electric currents,
• . The magnetic field B is defined in terms of force on moving charge in the Lorentz force law. The interaction of magnetic field with charge leads to many practical applications.
• Magnetic field sources are essentially dipolar in nature, having a north and south magnetic pole.
• The SI unit for magnetic field is the Tesla, which can be seen from the magnetic part of the Lorentz force law
• Electric current is the flow of electric charge through a conductor, such as wire or a circuit
• Electric current can be two types: Direct current, where the flow of electrons is constant and in one direction, and alternating current, where the flow of electrons periodically reverses
• A current is induced when a magnet is moved toward a coil, immediately increasing the magnetic field through the coil, or moved away from the coil momentarily decreasing the magnetic field through the coil