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