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Electromagnetic Induction Electromagnetic Induction Motion of a magnet in a coil or loop creates (induces) ____________ If coil is connected to complete circuit, _________ flows __________ motion is needed—it doesn’t matter which moves, the magnet or the coil Amount of voltage depends on __________ and ________________ in coil Faraday’s Law The induced voltage is proportional to the ______________ times the rate of change of the _________________ Magnetic field is changed by __________ or by changing the strength of the field in an __________________ Generators Rotating a coil in a magnetic field will create __________________ As coil rotates, amount of magnetic field ______________ by loop changes, inducing a changing voltage Frequency of alternating current is the same as ____________ of rotation of the coil Energy is converted from some ____________ form to ____________ Motors and Generators Both have same parts Motors convert ____________ energy to _____________ movement using the magnetic force on a moving charge to move the coil Generators convert _____________ to ___________- by using the magnetic force due to the coil movement to move the charges through the wire Transformers Two coils of wire wound on the same iron core so that changes in the magnetic field of the first coil (primary) induce ___________ across the second coil (secondary) If ac flows through primary, ac is ___________ in secondary Voltage in secondary depends on ______________ between primary and secondary If secondary has more turns, than transformer is called __________ and voltage is ______________ If secondary has fewer turns, then is called __________ and voltage is ____________ Power is not increased so if voltage is stepped up, current is ___________ Transformer Equations Primary turns = Primary voltage Secondary turns Secondary voltage (Voltage x current)p = (voltage x current)s Power Transmission Almost all electrical energy is sold as _____ because it is easy to change _________________ using __________________ High voltage and fairly low _________________are used to transmit power over long distances This reduces losses due to _________________ in the wires Voltage is stepped down to _________________ for homes Electric and Magnetic Fields Faraday’s law holds even if no _________________ is present A changing _________________ field induces an _________________ field Maxwell extended Faraday’s idea to say a changing _________________ field induces a _________________ field Electrical and magnetic fields are _________________ to each other Magnitude of _________________ field is proportional to _________________ of the other field Explained operation of __________________________________ __________________________________is the only speed where induction will continue without energy gain or loss