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chap212 - PHYS 1302 Introductory Physics II Chapter...

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1 PHYS 1302 Introductory Physics II Chapter 21:Electric current & DC circuits
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7/13/09 LAU/PHYS 1302 chap21 12-2 Topics square6 Concept of electric current square6 Ohm’s Law square6 Electric power and energy square6 DC circuits square6 Kirchhoff’s Laws square6 Capacitors square6 RC circuit
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7/13/09 LAU/PHYS 1302 chap21 12-3 Electric current I = Δ Q Δ t Mechanical Analog Work done by battery W = Δ Q ε ε : electromotive force, emf SI unit: coulomb / second = Ampere (A) 1 A = 1 C / s
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7/13/09 LAU/PHYS 1302 chap21 12-4 Example of source of constant potential difference A Voltaic cell (a chemical battery) is a source of constant potential difference by using chemical energy to separate positive and negative charges. PbO 2 (anode) Pb (cathode) H 2 SO 4 + H 2 O Discharing: Anode: PbO 2 + H 2 SO 4 + 2e + 2H + PbSO 4 + 2H 2 O Cathode: Pb + SO 4 -- PbSO 4 + 2e
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7/13/09 LAU/PHYS 1302 chap21 12-5 Electric resistance & Ohm’s Law V I Ohm' s Law V = IR R = V I R is the electrical resistance. SI unit for R: Ohm = Volt / Ampere 1 ohm ( Ω ) = 1V 1A
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7/13/09 LAU/PHYS 1302 chap21 12-6 Example 21-2 A Current-Carrying Wire
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7/13/09 LAU/PHYS 1302 chap21 12-7 Resistivity R = ρ L A L: length of wire A: area of wire ρ copper = 1.72 × 10 - 8 Ω⋅ m ρ : resistivity SI unit: Ω⋅ m
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7/13/09 LAU/PHYS 1302 chap21 12-8
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