"Relationship between Current, Voltage and Resistance" Ohm's Law PPT download

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"Relationship between Current, Voltage and Resistance" Ohm's Law PPT download

Part One Content: Basic Knowledge Key Points

Knowledge point 1: Explore the relationship between current and voltage

1. In the experiment of "Exploring the relationship between current and voltage in a conductor", when connecting the circuit, the voltmeter must be connected in parallel with the conductor (optional "series" or "parallel"); in the experiment, by changing the voltage at both ends of the conductor, multiple values ​​can be obtained Collect experimental data and draw experimental conclusions.

2. (Liangshan Prefecture High School Entrance Examination) The figure that can correctly reflect the relationship between the current passing through a certain resistor and the voltage across it is (C)

Knowledge point 2: Explore the relationship between current and resistance

3. When exploring the relationship between current, voltage, and resistance, if you want to explore the relationship between current and voltage, you need to control the resistance to be constant; when exploring the relationship between current and resistance, you need to control the voltage to be constant.

4. During the experiment of "Exploring the relationship between the current passing through the conductor and the resistance of the conductor", which of the following components should be observed to move the sliding varistor slide (B)

A. Sliding varistor slide B. Voltage indication number

C. Current representation D. Resistance

5. The picture shows the experimental circuit of "Exploring the Relationship between Current and Resistance". Regarding this experiment, which of the following statements is incorrect (C)

A. Close the switch and find that the current indication is too high. The reason may be that the resistance of the sliding rheostat connected to the circuit is too small.

B. The purpose of conducting multiple experiments is to draw scientific conclusions

C. During the experiment, after replacing the resistor with a larger resistance, the slider moved to the right appropriately.

D. The conclusion of the experiment is that when the voltage is constant, the current is inversely proportional to the resistance.

PPT on the relationship between current, voltage and resistance, part 2: improvement of comprehensive capabilities

6. When exploring "when the resistance of a conductor is constant, the relationship between the current in the conductor and the voltage at both ends of it", the function of the sliding rheostat is to change the voltage and current at both ends of the fixed-value resistor. After multiple measurements, a general rule can be obtained; When exploring "when the voltage of the conductor is constant, the relationship between the current in the conductor and the resistance of the conductor", the function of the sliding rheostat is to control the voltage across the resistor to remain constant.

7. As shown in the figure, when "exploring the relationship between current and resistance", if a 10 Ω resistor is used instead of a 5 Ω resistor during the experiment, the switch should be closed and turned to the left (optional "left" or "right") Adjust the slider of the sliding rheostat and look at the voltmeter until the readings on the voltmeter are consistent.

8. When a student was "exploring the relationship between current, voltage and resistance", he drew the image as shown in the figure based on the collected data. Which of the following conclusions is consistent with the image (C)

A. When the resistance is constant, the current increases as the voltage increases.

B. When the resistance is constant, the voltage increases as the current increases.

C. When the voltage is constant, the current decreases as the resistance increases.

D. When the voltage is constant, the resistance decreases as the current increases.

9. As shown in the figure, in the experiment of "exploring the relationship between current and resistance", which of the following statements is correct (A)

①The main scientific research method used in the experiment is the controlled variable method

② Before closing the switch, move the slide P to the far right to protect the circuit.

③After closing the switch, the function of moving the slider P is to control the current through the resistor to remain unchanged.

④After closing the switch, the purpose of moving the slide P is to take multiple measurements and average them to reduce errors.

A.①② B.②③

C.①③ D.②④

10. A certain study group used voltmeters and ammeters to measure multiple sets of data during an experimental study. The records are as shown in the table. Based on the data given in the table, please judge whether the circuit they used in the experiment may be (C)

11. (Liaocheng High School Entrance Examination) In the experiment of "exploring the relationship between current and voltage":

(1) Please draw a circuit diagram in the box that can change the voltage of the fixed value resistor and measure the voltage and current at the same time;

(2) Record the readings of the ammeter and voltmeter through experiments as shown in the table (R=10 Ω):

Analyze the data in the table. The data you think is wrong is experiment number 5. If you eliminate the wrong data, you can conclude that when the resistance of the conductor is constant, the current passing through the conductor is proportional to the voltage at both ends of the conductor;

(3) If you want to use this circuit to continue "exploring the relationship between current and resistance", you can adjust the "sliding rheostat" after each replacement of the resistor to keep the voltage across the resistor unchanged. The conclusion drawn from the experiment is that when the voltage across the conductor is constant, the current passing through the conductor is inversely proportional to the resistance of the conductor.

PPT on the relationship between current, voltage and resistance, part 3: Expansion, exploration and breakthrough

12. In the experiment of "Exploring the Relationship between Current and Resistance", the teacher provided 2 new dry batteries, an ammeter, a voltmeter, a switch, a sliding rheostat, one fixed-value resistor with a resistance of 10 Ω, 20 Ω and 40 Ω, and Some wires.

(1) Please draw lines according to Picture A to completely connect the actual picture (Picture B) (it is required that the wires do not cross. When the slider moves to the right, the resistance of the sliding rheostat becomes larger);

(2) Adjust the resistance of the sliding rheostat to the maximum value. After closing the switch, it is found that the voltmeter has a reading close to the power supply voltage, and the current reading is 0. The reason may be that the fixed value resistor is blocked;

(3) After troubleshooting, replace different fixed-value resistors for experiments, and fill in the measured data in the table below. The first reading of the ammeter is as shown in Figure C, and the reading is 0.2 A. During the experiment, the voltage indication number should be kept unchanged. If the voltage indication number is too small, the slider of the sliding rheostat should be slid to the left (optional "left" or "right");

(4) From the data in the table, it is concluded that when the voltage at both ends of the conductor is constant, the current passing through the conductor is inversely proportional to the resistance of the conductor (optional "direct proportion" or "inverse proportion").

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For more information about the PPT courseware "Ohm's Law: The Relationship between Current, Voltage and Resistance", please click the Ohm's Law ppt Relationship between Current, Voltage and Resistance ppt tag.

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Update Time: 2024-11-23

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