Essential LearningsA current-carrying wire issurrounded by anelectromagnetic field.
Essential LearningsAn electromagnet isproduced when currentpasses through a wirecoiled around an iron orsteel rod
Essential LearningsForces of repulsion andattraction cause motionwhen magnetic fieldsinteract.
Essential Learnings Motors transform electricalenergy into mechanicalenergy.
Essential Learnings Inside the motor–Current creates twoopposing electromagnetson the armature (thecopper coil and iron partthat spins)
Essential LearningsInside the motor–The electromagnets on thearmature repel thestationary magnets inposition around thearmature
Essential Learnings Generators transformmechanical energy intoelectrical energy.
Essential Learnings Inside the generator–electromagnetic inductionoccurs as a copper coilpasses through a magneticfield, creating electriccurrent
Essential Learnings Both motors and generatorshave the same basic partsbut their operations arereverse
Essential Learnings Internal components ofmotors and generators– A coil of copper wire wrappedaround a soft iron core(armature)– A set of permanent magnets thatcreate a magnetic field
Essential Learnings The differences betweenthem is the direction of theenergy flow and the energytransformation order
Why “The Big Switch” ?The term “switch” refers to thechangeover from motor togenerator of what is basically thesame device.As the direction of the energytransformation “switches” thedevice’s purpose “switches”
A Windmill (Wind Turbine)Windmills generators transformmechanical energy to electricalenergy.Done by creating an electric fieldinside the generator (electromagnetinduction) when a copper coil passesthrough a magnetic field