1. Chapter 18: Electric Potential and Capacitance
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2. Goals for Chapter 18 To calculate electrical potential energy.
To define potential.
To study equipotential surfaces.
To examine capacitors.
To determine electrical field energy.
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3. Electrical Potential and Voltage … Obvious and Not
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4. Electrical and Gravitational Forces − Figures 18.1−18.2
The forces are similar and conservative.
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5. Work and Energy Changes − Figure 18.3
Work is done on the charge by the field.
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6. Very High Energies Are Needed to Span Large Potentials
Lightning arcs represent billions of joules of energy.
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7. Parallel Plates and Energy Conservation –Example 18.2
See Figure 18.8 and the worked example on page 568.
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8. Potential of Point and Plate Charges –Examples 18.3 and 18.4
Refer to Figures 18.9 and with worked examples on pages 570 and 571.
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9. The Equipotential Map Around Charges –Figure 18.11
Around a charge or arrangement of charges, regions of equal potential may be drawn as equipotential lines.
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10. Equipotential Lines May Not Cross – Figure 18.12
Considering conduction and geometry one may prove why the lines do not cross.
Refer to page 573 in your text.
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11. The Capacitor – Figures 18.17 and 18.18
Devices may be constructed which separate two conductors of various sizes with materials of various conductance.
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12. The Symbol and Units of Capacitance –Figure 18.19
Refer to pages 575–578 in your text.
Define the Farad and follow Examples 18.6 and 18.7.
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13. Capacitors Are Often Joined – Figure 18.21
Like resistors, capacitors may be combined sequentially (in series).
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14. Capacitors Are Often Joined – Figure 18.22
Like resistors, capacitors may be combined in simultaneous fashion (in parallel).
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15. Capacitors Store Energy – Example 18.9
This is the whine you can hear while an electronic flash charges.
Refer to the worked example on pages 602–603.
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16. What Is Between the Conductors? – Figures 18.26 and 18.27
As we stated on an earlier slide, the amount of charge that may be stored in a capacitor depends in part on the "filler."
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17. Capacitors with Different Dialectrics – Figure 18.28
Select the dialelectric from Table 18.1.
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18. Calculation with a Specific Dialectric – Example 18.10
Refer to Figure and the worked example on page 585.
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