chapter28

chapter28 - Chapter 28 Direct Current Circuits 1. 2. 3. 4....

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Chapter 28 Direct Current Circuits 1. R connections in series and in parallel 2. Define DC (direct current), AC (alternating current) 3. Model of a battery 4. Circuits with 2+ batteries – Kirchhoff’s Rules 5. RC circuit
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子曰 子曰 :" 温故而知新 " Confucius says, reviewing helps one learn new knowledge. Concepts: Charge: positive, negative, conserve, induction. potential Electric: field flux Electrostatic equilibrium: no moving charge. Current: moving charge Capacitance: potential over charge Resistance: potential over current Resistance and Resistivity (conductivity) and temperature:
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Laws: Coulomb's: force and charge. Gauss’s: electric flux and charge. Ohm’s: electric potential and current. Circuits and components: Symbols: wire, battery, C, Switch… Power: current time potential difference: Capacitor: in parallel in series Resistor: discuss today
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Resistor connections In series. Condition: = = Δ = Δ + Δ 1 2 1 2 I I I V V V Δ + Δ Δ Δ Δ = = + + 1 2 1 2 1 2 1 2 eq V V V V V R R R I I I I Δ 1 V Δ 2 V In parallel. Condition: = + Δ = Δ = Δ 1 2 1 2 I I I V V V + = = + + Δ Δ Δ Δ 1 2 1 2 1 2 1 2 1 1 1 eq I I I I I R V V V V R R Δ 1 V Δ 2 V
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Resistor connections In series, : voltage sharing power sharing Δ = Δ 1 1 2 2 V R V R = 1 1 2 2 P R P R In parallel, : current sharing power sharing = = 1 2 I I I Δ 1 V Δ 2 V Δ = Δ = Δ 1 2 V V V = = 1 2 1 1 2 2 2 1 , or I R I R I R I R = = 1 2 1 1 2 2 2 1 , or P R PR P R P R
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Resistors connections, summary c In series c In parallel ... = + + + 1 2 3 eq R R R R ... = + + + 1 2 3 1 1 1 1 eq R R R R Δ = Δ 1 1 2 2 V R V R = 1 1 2 2 P R P R = 1 1 2 2 I R I R = 1 1 2 2 PR P R
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Resistors in Series – Example c Use the active figure to vary the battery voltage and the
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This note was uploaded on 05/06/2008 for the course PHYS 1304 taught by Professor Ye during the Spring '08 term at SMU.

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chapter28 - Chapter 28 Direct Current Circuits 1. 2. 3. 4....

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