Wrapping up chapter 12.1.

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Presentation transcript:

Wrapping up chapter 12.1

REMINDER Monday-April 18th (2011) YES, A Monday Examination #3 is scheduled for Monday-April 18th (2011) YES, A Monday

April 2011 1 2 3 4 Complete Induction 5 6 AC 7 8 Quiz? 9 10 11 OPTICS Sunday Monday Tuesday Wednesday Thursday Friday Saturday 1 2 3 4 Complete Induction 5 6 AC 7 8 Quiz? 9 10 11 OPTICS 12 13 OPTICS 14 15 OPTICS Quiz 16 17 18 EXAM #3 (No Optics) 19 20 OPTICS 21 22 OPTICS 23 24 25 (LAST LASS) 26 27 28 29 30 FINAL HPA 119 9:00 AM

Self-inductance – Any circuit which carries a varying current self-induced from it’s own magnetic field is said to have INDUCTANCE (L).

Faraday says this is the emf! If the FLUX changes a bit during a short time Dt, then the current will change by a small amount Di. Faraday says this is the emf! This is actually a calculus equation Inductance Defined 5/9/2019 Induction

So … E= The UNIT of “Inductance – L” of a coil is the henry. SYMBOL: (-) sign is Lenz’s Law The UNIT of “Inductance – L” of a coil is the henry. SYMBOL: 5/9/2019 Induction

Remember that a Capacitor stored ENERGY? U=(1/2)CV2 U=Area=(1/2)LI2 i Li LI Li DU i Di I Induction 5/9/2019 Induction

SO … Energy Stored in a capacitor The energy stored in a capacitor with capacitance C and a voltage V is U=(1/2)CV2 5/9/2019 Induction

The Energy stored is in the Magnetic Field Consider a solenoid with N turns that is very long. We assume that the field is uniform throughout its length, ignoring any “end effects”. For a long enough solenoid, we can get away with it for the following argument. Maybe. 5/9/2019 Induction

Energy Storage in Inductor 5/9/2019 Induction

Up and Down and Up and Down and …..

NEXT AC Circuits But …

Finish Working it…..

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