chp . 20 circuits : series and parallel
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Chp . 20 Circuits : Series and Parallel. Schematic Diagrams of Circuits:. Symbols *Copy Table 20-1 page 731. Symbol Conventions for Circuits. Schematic map keys for electronic components. emf. - PowerPoint PPT PresentationTRANSCRIPT
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Schematic Diagrams of Circuits: Symbols
*Copy Table 20-1 page 731
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Symbol Conventions for Circuits.Schematic
map keys for electronic components.
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emf The source of potential difference and electrical
energy is the circuit emf. (ie. Battery or outlet)The emf is the energy per unit charge supplied by
a source of electric current. (ie. Charge Pump)The terminal voltage is actually slightly less than
the emf. Unless otherwise stated , any reference in this book to potential difference across a battery should be thought of as the potential difference measured across the battery terminals. (ie. Potential difference across a load equals the terminal voltage.)
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Resistors in Series Circuits
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Resistors in SeriesPage 737 Figure 20-11
Req = R1 + R2 + R3 …
Equivalent resistance equals the total individual resistances in series
*Example 20A page 738
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Resistors in Parallel Circuits
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Resistors in ParallelPage 741-742 Fig. 20-14
1 = 1 + 1 + 1 Req R1 R2 R3
Equivalent resistance of resistors in parallel can be calculated
using a reciprocal relationship
* Example 20B page 743
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Homework Chp. 20 Chp. 20 BK
20A 1- 4 2. a. 24Ω b. 1A c. C.1A 4. a) 11.28 Ω =Req I= .798 A
b) V= 5.79 V V= 3.22 V
• 20B 1,3,4 4. a) 2.99Ω b)36V c)2A= I 6A=I3
Chp. 20 WKBK 20A 1,2,4,5 1. 2000 kΩ 2. 4.1 x 108 Ω
4. V= 20000 V 5. R 12 =8.5 Ω
R13 = 20.5 Ω
R23 = 20 Ω
• 20B 1,4 1. Req = 1.3 Ω 4. R= .1Ω