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Chapter 20 Electric Circuits Emf & Current [20.1] charge - - PowerPoint PPT Presentation
Chapter 20 Electric Circuits Emf & Current [20.1] charge - - PowerPoint PPT Presentation
Chapter 20 Electric Circuits Emf & Current [20.1] charge current time q I t Relationship between V, I, R [20.1] Ohm's Law: voltage ( Current ) Resistance ( ) V ( ) R I ( ) Resistance & Resistivity [20.3]
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current charge time I q t
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Relationship between V, I, R [20.1]
Ohm's Law: voltage Current ( ) Resistance ( ) V I ( ) R ( )
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Resistance & Resistivity [20.3]
Resistiv ity Equation: Resistance Resistivity ( ) Length ( ) Area R
L
( ) A
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Using Dimensional Analysis, find the units for Resistivity
Resistiv ity Equation: Resistance Resistivity ( ) Length ( ) Area R
L
( ) A
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R
L
( ) A R A L
- hms m2
m
- hm m
m
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Electric Power [20.4]
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Voltage work charge W q J coul work charge ( ) Voltage ( ) work q ( ) V ( ) Power work time q t
V I V P I V
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Equating Power with Resistance with the Help Of Ohm’s Law
P I V V I R P I I R ( ) I2 R P V R
V V2 R
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Series Circuits [20.6]
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Current is everywhere the same throughout.
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There is a voltage drop across each resistor.
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Equiv alent Resistance V I R1
I R2
I R
I Req Req R1 R2 R3 .. V I Req
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Equivalent Resistanc
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Parallel Circuits [20.7]
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Same Thing as:
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Voltage is everywhere the same throughout:
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Itotal I1 I2
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Itotal I1 I2 V R1 V R2 Itotal V 1 R1 1 R2
where 1 Req 1 R1 1 R2 Itotal V 1 Req
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“Product Over Sum” Rule:
1 Req 1 R1 1 R2 Itotal V 1 Req
Req R1
R2
R1 R2
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Practice:
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1 Req 1 R1 1 R2 1 Req 1 4 1 8 2 8 1 8 3 8 Req 8 3 2.67
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Product Ov er Sum Rule Itotal V 1 Req
Req 4 ( ) 8 ( ) 4 8 ( ) 32 12 2.67
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Complex Circuits [20.8]
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Kirchhoff’s Laws [20.10]
- Junction Rule: What
goes in equals what comes out.
- Loop Rule: Voltage rises
equals voltage drops.
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Junction Rule [20.10]
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Loop Rule [20.10]
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Measuring V, I, R [20.11]
- Voltmeter
- Ammeter, Galvanometer
- Wheatstone Bridge
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Proper Setup
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R x R 1 R v R 2
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Capacitors in Series & Parallel [20.12]
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Page 654 # 61
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Page 654 # 61
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Page 654 # 63 Find Req
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Page 654 # 63 Find Req
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Page 654 # 65 Find Req
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Page 654 # 65 Find Req
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Page 654 # 67 Find Req
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Page 655 # 69 Find Req
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