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chapter28

# 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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:" g °1 " 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:
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: = = = ∆ + ∆ 1 2 1 2 I I I V V V + ∆ = = +♠ + 1 2 1 2 1 2 1 2 eq V V V V V R R R I I I I 1 V 2 V In parallel. Condition: = + = ∆ = ∆ 1 2 1 2 I I I V V V + = = +♠ + 1 2 1 2 1 2 1 2 1 1 1 eq I I I I I R V V V V R R 1 V 2 V
Resistor connections In series, : voltage sharing power sharing = 1 1 2 2 V R V R = 1 1 2 2 P R P R In parallel, : current sharing power sharing = = Q 1 2 I I I 1 V 2 V = ∆ = ∆ Q 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 In series In parallel ... = + + + 1 2 3 eq R R R R ... = + + + 1 2 3 1 1 1 1 eq R R R R = 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
Resistors in Series – Example Use the active figure to vary the battery voltage and the resistor values Observe the effect on the currents and voltages of the individual resistors PLAY ACTIVE FIGURE

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