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 Faraday’s 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 ε 2 t t ε 2 t ε 2 t ε 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 ε 2 t t ε 2 t ε 2 t ε 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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