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PHYSICS - Power generation A generator requires a relative motion between a magnetic field and a coil. In power stations, an electromagnet is fed with a current to produce an induced EMF. Electromagnetic induction refers to how magnetic fields can be used to produce electric currents and the effect caused if, either the force is applied externally or the magnetic field is changed. When rotating a coil in a magnetic field, the flux through the coil varies as shown in a the below diagram: * A representation of this variation is as follows: * According to Faraday's Law, induced EMF E= -do/dt, which can be determined by the negative gradient of the previous graph. Therefore induced EMF varies with times as follows: * To provide a more even supply of power, generators are designed with three sets of coils, which produce three separate supplies of alternating current known as a three-phase generator. It is these...

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