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Callan Robson asked Describe two applications of electromagnetism and induction?
you may base your explanation around any two of the following: Inductors Transformers Motors Generators Relays Solenoids
And got the following answer:
Generators are basically motors being rotated by an external force rather than the motor rotating something external. A motor operates by using magnetic repulsion and attraction, current is supplied by a source, this electric current can be alternating or direct, (rectified or un-rectified), current is fed through wire which then exhibits an electromagnetic field "going around the wire" orient a wire to look like a . (period) then the magnetic field is a circle around that dot.The collection of these electromagnetic fields along with timed pulses in relation to the position of magnets causes rotation. In the generator aspect, when the magnets pass the coils, the magnetic field goes through the area of the wires and by eddy currents/induction energy is created. The dimensions / design of the generator determines the output of electricity whether it is 50Hz or 60Hz Transformers use the area of the cross section of the wires to increase or decrease power from incoming magnetic fields, a bigger loop will get more energy while a smaller loop (less area) receives less. Loop I mean cross sectional area, cut a coke can in half, look at it so it looks like a circle. Solenoids use electrical current to generate a magnetic field usually in a linear direction, coil wire around a nail, apply current and you have an electromagnet. Keep in mind the basic principle, a current goes through a wire, a magnetic field is produced. A piece of wire passes through a magnetic field, current is produced. The orientation / direction of travel does matter. Hence the design of the stator / rotors of most electric motors.
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