24 Inductors

24 Inductors - Craig Ogilvie Craig Ogilvie 11 Summary of...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Summary of Lecture 23 Induced currents only happen because there is a force on mobile charges Electric force from E-field <= B-field changes in time Magnetic force, if loop moves in non-uniform B-field Applications of Faradays law of induction AC electricity generation , loop rotating in B-field energy supplied by external source energy dissipated by devices connected to circuit Eddy currents always act to oppose change brakes, falling magnets, metal detectors Craig Ogilvie Craig Ogilvie 22 Goals For Today/Wednesday Develop physics of inductors protect sensitive electronics from sudden spikes of current spark plug develops enough voltage to spark when its only power source is a 12 V battery Today: gain experience in calculating mutual inductance of two coils inductance of single solenoid/coil use of inductors in circuits Craig Ogilvie Craig Ogilvie 33 Two coils, i.e. solenoids Change the current in coil 1 B-field changes with time => induces E-field at coil 2 Current in coil 2 induced emf in coil 2 demo Craig Ogilvie Craig Ogilvie 44 Question: Given i1(t) what is voltage across coil 2, 1st round 1. 1 2. 2 3. 3 4. 4 t i 1 2 t t 2 t 2 t 2 0 of 300 Craig Ogilvie Craig Ogilvie 55 Question: Given i1(t) what is voltage across coil 2, 2nd round 1. 1 2. 2 3. 3 4. 4 1 2 3 4 0% 0% 0% 0% t i 1 2 t t 2 t 2 t 2 0 of 300 Change in B-field, flux followed by no change in flux Craig Ogilvie...
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24 Inductors - Craig Ogilvie Craig Ogilvie 11 Summary of...

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