People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition Ninth Grade Physics
Shanghai Science Edition 8th Grade Physics
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University eighth grade physics volume one
Lu Ke Edition High School Physics Compulsory Course One
Beijing Normal University Ninth Grade Physics Volume 1
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
Lu Jiao Edition Eighth Grade Physics Volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao edition eighth grade physics volume 1
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
Category | Format | Size |
---|---|---|
Shanghai Science Edition Ninth Grade Physics | pptx | 6 MB |
Description
"Series and Parallel Connections of Resistors" Exploring Circuit PPT Courseware 3
review:
Ohm's law:
1. Content: The current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.
2. Expression: I=U/R
3. Deformation formula: U=IR R=U/I
1. Characteristics of total resistance of series circuits
What are the rules for resistors in series circuits?
We can apply experiments and Ohm's law to study.
Derivation method:
As shown in the figure: Resistors R1 and R2 are connected in series. Let the total resistance be R. The voltages at both ends of R1 and R2 are U1 and U2 respectively. The total voltage is U and the current is I.
According to Ohm's law, we can get:
U=IR U1=IR1 U2=IR2
Because: U=U1 +U2
Therefore: IR=IR1 +IR2
Available: R=R1+R2
Conclusion: The total resistance of a series circuit is equal to the sum of the resistances of its parts.
2. Total resistance characteristics of parallel circuits
What are the rules for resistors in parallel circuits?
We can apply experiments and Ohm's law to study.
Reasoning method: As shown in the figure, resistors R1 and R2 are connected in parallel. Let the total resistance be R, the current in the main circuit be I, the currents passing through R1 and R2 are I1 and I2 respectively, and the voltage at both ends of the parallel circuit is U,
1. Total resistance characteristics of parallel circuits
The total resistance of the parallel circuit is less than the resistance of each branch, because the resistance in parallel is equivalent to increasing the cross-sectional area of the conductor.
2. n number of R0 resistors with the same resistance value are connected in parallel, the total resistance
R=1/n R0
practice
1. There are two conductors with resistances of 10 ohms and 30 ohms respectively. After they are connected in series, the current passing through the 10 ohm resistor is 0.5 A.
Question: ①What is the power supply voltage?
②What are the voltages on the two resistors?
③What is the relationship between resistance and voltage in a series circuit?
Solution: ① R=R1+R2=10Ω+30Ω=40Ω
I=I1=0.5A
U=IR=0.5A×40Ω=20V
② U1=I1R1=0.5A×10Ω=5V
U2=I2R2=0.5A×30Ω=15V
③What is the relationship between voltage and resistance in a series circuit?
Distribute the power supply voltage according to the resistance ratio
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"Series and Parallel Connections of Resistors" Exploring Circuit PPT Courseware 2:
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"Series and Parallel Connections of Resistors" Exploring Circuit PPT Courseware:
"Series Connection and Parallel Connection of Resistors" Exploring Circuit PPT Courseware 1. Exploring the Series Connection of Resistors Asks the question: Is the total resistance of two resistors connected in series larger or smaller than each resistor participating in the series connection? Conjecture and hypothesis: Several resistors connected in series are equivalent Due to the increase of _________ total...
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