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

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

Part One Content: Basic Knowledge Key Points

Knowledge point 1: Resistance characteristics of series circuits

1. Two resistors with resistance values ​​of 20 Ω and 40 Ω are connected in series in the circuit, and their total resistance is 60 Ω. The scientific method used when introducing the concept of "total resistance" is the equivalent substitution (optional "equivalent substitution" or "control variable") method.

2. The following is a certain part of the circuit. Its connection method can be compared with the situation in the figure (B)

3. A sliding rheostat is marked with "1.5 A | 50 Ω". When it is connected to the circuit in series with a resistor with a resistance of 30 Ω, the variation range of the total resistance of the entire circuit is (D)

A.0~30 Ω B.0~50 Ω

C.0~80 Ω D.30 Ω~80 Ω

Knowledge point 2: Voltage division rules of series circuits

4. In the circuit shown in the figure, the supply voltage is 12 V. After closing the switch, the ammeter indicates 0.4 A and the voltmeter indicates 8 V. Then the resistance of resistor R2 is 10Ω. If the slider of sliding rheostat R1 is moved to the right, the voltmeter indication will become smaller. (Select "get bigger", "get smaller" or "unchange").

5. As shown in the figure, the power supply voltage remains unchanged, R2=6 Ω, when S1 and S2 are closed, the current is 1.5 A; when S1 is closed and S2 is open, the current is 0.6 A, then the power supply voltage is 9V, the resistance of R1 is 9Ω.

6. In the circuit as shown in the figure, move the slider to terminal a before closing the switch. When the switch is closed, the voltage is 4 V. If the slider is moved to the midpoint, the voltage is (B).

A. Equal to 2 V B. Greater than 2 V

C. Less than 2 V D. Unable to determine

PPT on the application of Ohm's law in series and parallel circuits, part 2: improvement of comprehensive capabilities

7. In the circuit as shown in the figure, the power supply voltage U=6 V is known, the resistance value range of the sliding rheostat is 0~20 Ω, the resistance R=15 Ω, the range of the voltmeter is 0~3 V; the range of the ammeter is 0~0.6 A. After closing the switch and moving the sliding rheostat slide, the current indication number will change in the range of 0.2 A~0.4 A.

8. (Suihua High School Entrance Examination) In the circuit shown in Figure A, the power supply voltage is constant, R0 is a fixed-value resistor, and R is a sliding rheostat. After closing the switch S, in the process of moving the slider P, the relationship between the resistance value of the ammeter indication I and R is as shown in Figure B. The relationship between the resistance values ​​of the voltmeter indication U and R is shown in Figure C. Then the resistance of R0 is 10Ω, and the power supply voltage is 24V.

9. (Guiyang High School Entrance Examination) In the circuit shown in the figure, the power supply voltage remains unchanged. When the switch S is closed and the slider P of the sliding rheostat is moved to a certain position, the ammeter's indication is I1; when the slider P is moved to another position, the ammeter's indication is I2 and the voltage indication is 1 V. If I1:I2=4:3, the ratio of the resistance values ​​of the two sliding varistors before and after is 2:3, then the power supply voltage is 4V.

10. As shown in the figure, the power supply voltage is always 6 V, R1 is a fixed-value resistor, and A and B are the two ends of the sliding rheostat R2. Close the switch, when the slider P moves to terminal A, the ammeter reads 0.6 A; when the slider P moves to terminal B, the ammeter reads 0.2 A. Then the maximum resistance values ​​of R1 and sliding rheostat R2 are respectively (B)

A.10 Ω,15 Ω B.10 Ω,20 Ω C.10 Ω,30 Ω D.30 Ω,10 Ω

11. There are two fixed-value resistors R1 and R2 with different resistances. The I-U images of their currents changing with the voltage are as shown in the figure. If the total resistance of R1 and R2 connected in series is R string, then the I-U image of R string The area is (A)

A.I area

B.II area

C.ⅢArea

D. None of the above are correct

12. As shown in the figure, the power supply voltage is constant. If the switches S1 and S2 are closed, the voltage representation is U1; if the switch S1 is closed and the switch S2 is opened, the voltage representation is U2. If U1∶U2=3∶2, then The ratio of the resistance values ​​of resistors R1 and R2 is (D)

A.3:2 B.3:1

C.1∶2 D.2∶1

Application of Ohm's Law in Series and Parallel Circuits PPT, Part 3: Expansion and Research Breakthroughs

14. In the circuit shown in Figure A, the power supply voltage remains unchanged. Close the switch S, and when the sliding plate P of the sliding rheostat slides from the right end to the left end, the I-U images of R1 and R2 are as shown in Figure B. beg:

(1)Power supply voltage;

(2) Resistance value of R1;

(3) The maximum resistance value of sliding rheostat R2.

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