| Category | Format | Size |
|---|---|---|
| Beijing Normal University Ninth Grade Physics Volume 1 | pptx | 6 MB |
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 2
Description
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 2
Series and Parallel Resistors Equivalent Substitution Method
Resistors in series are equivalent to increasing the length of the conductor
The total series resistance is greater than any of the partial resistances
Resistors in parallel are equivalent to increasing the cross-sectional area of the conductor
The total resistance in parallel is smaller than any of the partial resistances
Special cases of series and parallel connection of resistors
The total resistance of the series circuit is equal to the sum of the series resistances R string = R1 + R2
n resistors R0 with the same resistance are connected in series, the total resistance R=nR0
The reciprocal of the total resistance of a parallel circuit is equal to the sum of the reciprocals of the parallel resistances
1/R union=1/R1+1/R2 R union=R1R2/R1+R2
n resistors with the same resistance are connected in parallel, the total resistance R and = R0/n
Combined training
Example 1. As shown in the figure, it is known that R1=8Ω, R2=12Ω, and the power supply voltage U=6V. Find
(1) Current in the circuit;
(2) What is the voltage across R1 and R2?
(3) What is the ratio of the voltages divided by the two resistors?
Example 2. As shown in the figure, the power supply voltage is 12V, R1=20Ω, R2=5Ω. Find (1) the total resistance R and the total current in the main circuit? (2) What is the ratio of the currents passing through the two resistors?
Example 3. As shown in the figure, it is known that R1=9Ω and R2=12Ω. When the switch S is open, the current is expressed as I. When the switch S is closed, the current is expressed as I�. Find I:I�.
Example 4: As shown in the figure, the power supply voltage is 10V and remains unchanged. The resistance R1=20Ω. The maximum resistance of the sliding rheostat is 30Ω. When the slider slides from terminal a to terminal b, find the readings of the ammeter and voltmeter. variation range?
Exercise 1
There is a small light bulb. The resistance of the filament is 8.3Ω when it lights normally, and the voltage is 2.5V when it works normally. If there is only a power supply with a voltage of 6V, to make the small light bulb work normally, do I need to connect a resistor in series or in parallel? What's the resistance?
Exercise 2
As shown in the figure, the reading of ammeter A1 is 0.4A, and the reading of ammeter A2 is 0.5A. It is known that R2=80Ω. Find the resistance of R1?
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For more information about the "Ohm's Law ppt Resistance Relationship in Series and Parallel Circuits" PPT courseware, please click the Ohm's Law ppt Resistance Relationship in Series and Parallel Circuits ppt tag.
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 6:
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 6 Project Main Contents Equivalent Resistance Connect the resistors R1 and R2 to a circuit with a voltage of U (series or parallel). The current in the circuit is I; if a resistor is used R replaces these two resistors and is connected to the circuit in the circuit.
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 5:
"Relationship between Resistances in Series and Parallel Circuits" Ohm's Law PPT Courseware 5 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. This law is called Ohm's law. 2. Formula: I＝U/R single...
"Relationship between Resistors in Series and Parallel Circuits" Ohm's Law PPT Courseware 4:
"Relationship between Resistances in Series and Parallel Circuits" Ohm's Law PPT Courseware 4 Thinking In actual circuits, there are usually several or more conductors forming a circuit. What is the total resistance after several conductors are connected in series? What is the relationship between total resistance and partial resistance? The electrician is repairing household appliances...
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Update Time: 2024-07-30
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