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chapter28 - Chapter 28 Direct Current Circuits 1 2 3 4 5 R...

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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 :" 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 circle6 In series circle6 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 circle6 Use the active figure to vary the battery voltage and the resistor values circle6 Observe the effect on the currents and voltages of the individual resistors PLAY ACTIVE FIGURE
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Resistors in Parallel – Example circle6
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