Lecture 8 Friday January 30 Capacitors and Review.

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Presentation transcript:

Lecture 8 Friday January 30 Capacitors and Review

Capacitors Can store electric charge Two conductors, one with +Q, the other with -Q and voltage difference ΔV Capacitance defined by Units C/V = 1 Farad = 1F

Plane Parallel Plate Capacitor Special case of plane parallel plate capacitor

Put dielectric spacer between plates Dielectric = insulator is the dielectric constant. See table 21.2 page 709. Also increases maximum voltage before break down. How would you make C large while keeping physical size of capacitor small?

Energy stored in capacitor U is the energy stored, book uses U C Energy stored in demonstration capacitor?

Problems for Review 20: CQ6, 9, CQ13, CQ15, 14, 25, 33, 35 WB 20: 1e, 7b, 13, 14, 18, 27 21: CQ4, 6, 10, 16, 20, 25, 33,36, 38, MC20, MC23-27 WB 21: 6b, 10b, 11b,