Download 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
 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.)
Resistors in Series Circuits
Resistors in Series
 Page 737 Figure 20-11
Req = R1 + R2 + R3 …
Equivalent resistance equals the total individual resistances in series
*Example 20A page 738
Resistors in Parallel Circuits
Resistors in Parallel
 Page 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
Homework Chp. 20
Chp. 20 BK
 20A 1- 4
• 20B 1,3,4
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
4. a) 2.99Ω b)36V c)2A= I 6A=I3
Chp. 20 WKBK
 20A 1,2,4,5
• 20B 1,4
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
1. Req = 1.3 Ω
4. R= .1Ω