"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT teaching courseware

Description

"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT teaching courseware

Part One: Knowledge Management

1. series connection of resistors

Total resistance: The total resistance of a series circuit is equal to the sum of the resistances of each part of the circuit.

Formula: R＝R1＋R2.

Explanation: When several conductors are connected in series, it is equivalent to increasing the length of the conductor; when several conductors are connected in series, the total resistance is greater than any one resistance; the relationship between the total resistance R and R0 of n identical resistances R0 connected in series: R=nR0.

The voltage division rule: U1/U2=R1/R2.

Application: If the total voltage in the circuit is greater than the voltage of the electrical appliance during normal operation, a resistor can be connected in series in the circuit to divide the excess voltage to protect the electrical appliance.

2. Resistors in parallel

Total resistance: The reciprocal of the total resistance of a parallel circuit is equal to the sum of the reciprocals of the parallel resistances____________.

Formula: 1R＝1R1＋1R2.

Explanation: When several conductors are connected in parallel, it is equivalent to increasing the cross-sectional area of ​​the conductor; when several conductors are connected in parallel, the total resistance is smaller than any one resistance; the total resistance of n identical resistors R0 connected in parallel is R=R0n; two resistors In parallel, the total resistance R=R1R2R1+R2.

Application of Ohm's Law in Series and Parallel Circuits PPT, Part 2: Classification and Research

Type One: Application of Ohm’s Law in Series Circuits

[2017•Changde, Hunan]As shown in the figure, R0 is a fixed-value resistor, R1 is a sliding rheostat, and V1 and V2 are commonly used voltmeters in the laboratory (the terminals are marked with "-" and "3" , "15"), after closing the switch, adjust the slide P so that the pointers of the two voltmeters point to the same position. Which of the following statements is correct (D)

A． The ratio of the indications of voltmeter V1 and V2 is 1:5

B． The ratio of the current through the two resistors is 4:1

C. The ratio of the voltages across R0 and R1 is 1:5

D. The ratio of the resistance values ​​of R0 and R1 is 1:4

Type 2: Application of Ohm’s Law in Parallel Circuits

[2018•Beijing]As shown in the figure, the voltage U across the power supply is 9 V and remains unchanged, and the resistance of resistor R1 is 10 Ω. After closing the switch S, the ammeter A reads 1.2 A. beg:

(1) The indication I1 of ammeter A1;

(2) The resistance of resistor R2.

Application of Ohm's Law in Series and Parallel Circuits PPT, Part Three: In-Class Evaluation

1. [2017•Fujian]Which of the following statements is correct (B)

A． The total resistance of a parallel circuit is equal to the sum of the reciprocals of each resistance

B． Any resistance in a series circuit is less than the total resistance of the series

C. The greater the resistance in a series circuit, the smaller the voltage across it

D. The greater the resistance in a parallel circuit, the greater the current through it

2. [2017•Beijing] Regarding parallel circuits, which of the following statements is correct (C)

A． The more electrical appliances used in a parallel circuit, the greater the total resistance.

B． The current in a conductor in a parallel circuit is proportional to the resistance

C. In a circuit with two resistors connected in parallel, if one resistance remains unchanged and the other resistance becomes larger, the total resistance must become larger.

D. The total resistance of a parallel circuit is equal to the sum of the reciprocals of the resistances of the parallel conductors

3. [2018•Guangxi Baise]As shown in the figure is the I-U image of resistors A and B. The following statement is correct (　C　)

A． The supply voltage is 9 V

B． The resistance of the fixed value resistor R is 6 Ω

C. The resistance range of the sliding rheostat is 0 ~ 18 Ω

D. If there is poor contact in the fixed value resistor R, the current

The representation number is 0, and the voltage representation number is 9 V.

Application of Ohm's Law in Series and Parallel Circuits PPT, Part 4: Layered Operations

1. [2018•Hunan Shaoyang]It is known that R1:R2=2:3, connect them in a circuit with a power supply voltage of 12 V as shown in the figure, close S, then the ratio of the currents passing through them is The ratio of the voltages across them is (A)

2. [2018•Hunan Loudi] Figure A is the I-U image of the light bulb L and the fixed value resistor R. Connect L and R to the same power supply in two ways: Figure B and Figure C. If In picture B, U1:U2=m, in picture C, I1:I2=n, then the following option is correct (B)

A． m=n B. m>n

C. m

3. [2018•Jiangsu Suqian]As shown in the figure, the power supply voltage remains unchanged, first close the switch S1, the voltage representation is U1; then close the switch S2, the voltage representation is U2, the resistance R1, R2 The ratio of resistance is (D)

A． U1∶U2

B． U2:U1

C. U2: (U2－U1)

D. U1:(U2－U1)

4. [2018•Panzhihua, Sichuan]The picture shows the relationship between the voltage and current of the two resistors R1 and R2. It can be seen from the picture that the resistance of resistor R1 is 10 Ω. If the two resistors are connected in parallel and then connected At both ends of the 3 V power supply, the dry circuit current is 0.9 A.

Keywords: Free download of PPT courseware for ninth-grade physics from the People's Education Press, PPT download on the application of Ohm's law in series and parallel circuits, PPT download of Ohm's law, .PPT format;

For more information about "Ohm's Law Application of Ohm's Law in Series and Parallel Circuits" PPT courseware, please click Ohm's Law ppt Application of Ohm's Law in Series and Parallel Circuits ppt tag.

"End of Chapter Summary and Improvement" Ohm's Law PPT:

"End of Chapter Summary and Improvement" Ohm's Law PPT Part One Content: Key Breakthrough Type 1 The relationship between current, voltage and resistance 1. As shown in the figure, in the experiment to study the relationship between current, voltage and resistance, a fixed value should be selected first Resistance, by changing the sliding rheostat..

"Application of Ohm's Law in Series and Parallel Circuits" Download Ohm's Law PPT (Lesson 2):

"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT Download (Lesson 2) Part One Content: Knowledge Points Basic Knowledge Point 1 Resistance Characteristics of Parallel Circuits 1. As shown in the figure, when switch S is closed and opened , the ratio of the indications of the ammeter is 3:1, then the electric...

"Application of Ohm's Law in Series and Parallel Circuits" Download Ohm's Law PPT (Lesson 1):

"Application of Ohm's Law in Series and Parallel Circuits" Ohm's Law PPT Download (Lesson 1) Part One Content: Knowledge Points Basic Knowledge Point 1 Resistance Characteristics of Series Circuits 1. Two resistors with resistances of 20 and 40 are connected in series. In the circuit, its total resistance is 60. lead..

File Info

Update Time: 2024-10-06

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

Preview