"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware

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"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware

Explore the relationship between current, voltage, and resistance

1. Research plan: (1) Control _____ unchanged and explore the relationship between current and voltage; (2) Control _____ unchanged and explore the relationship between current and resistance.

2. Explore the conclusion: (1) When the resistance is kept constant, the current and the voltage have a _____ relationship; (2) When the voltage is kept constant, the current and the resistance have a _____ relationship.

Key points of the experiment "Exploring the relationship between current, voltage and resistance"

1. Research plan: Use the method of controlling variables and use the circuit as shown in the figure to explore in two situations: ① keep the resistance constant and explore the relationship between current and voltage; ② keep the voltage constant and explore the relationship between current and resistance .

2. The role of the sliding rheostat: In experiment ①, adjust and change the voltage at both ends of the fixed value resistor R to facilitate obtaining multiple sets of U and I data; in experiment ②, after replacing the fixed value resistor R with different resistance values, adjust and change Keep the indication of the voltmeter (the voltage across R) unchanged to ensure the experimental condition of "keeping the voltage constant".

[Example question] Xiao Ming wanted to explore "the relationship between current and resistance in a circuit" and designed the circuit diagram as shown in Figure A (the power supply voltage is always 6 V).

(1) According to the picture A designed by Xiao Ming, use a pencil to connect the physical picture of picture B completely.

(2) Xiao Ming filled in the data obtained from the first experiment into the table below, then changed the resistance between points E and F from 10 Ω to 20 Ω, and adjusted the sliding plate P of the sliding rheostat to _____ (fill in " A" or "B") move until _____. At this time, the pointer position of the ammeter is as shown in Figure C. Please fill in the measured current value in the table below.

Experiment No. Voltage/V Resistance/Ω Current/A

1 4 10 0.4

2 4 20

(3) Xiao Ming came to the following conclusion based on experimental data: current is inversely proportional to resistance. Please evaluate the above research process and write two comments: __________; __________.

Analysis: Since current is related to voltage and resistance, in the experiment to explore the relationship between current and resistance, the voltage at both ends of the resistor must be kept constant when changing the resistance. At the same time, the relationship between current and resistance must be obtained. It is not necessary to conduct one or two experiments. To be reliable, multiple experiments must be conducted to draw conclusions.

1. A fixed-value resistor is connected to a certain circuit. When the voltage is 1.5 V, the current flowing through it is 0.15 A; when the voltage increases to twice the original value, the following statement is correct: ()

A. The current is doubled. B. The resistance is doubled.

C. The current is 1/2 of the original value D. The resistance is 1/2 of the original value

2. Xiaojun used the circuit as shown in the figure to study "the relationship between the current passing through a conductor and its resistance." He conducted two experiments with resistances of 5 Ω and 10 Ω respectively. After completing the first experiment, Xiaojun The military changes the resistance R between points A and B from 5 Ω to 10 Ω. After closing the switch, the sliding rheostat should ()

A. Keep the varistor slide stationary

B. Move the rheostat slide to the right

C. Move the rheostat slide to the left

D. Replace the sliding rheostat with a larger resistance value

3. Student Xiaogang used the circuit diagram as shown in the figure to study the relationship between current and resistance. During the experiment, when the resistance between points A and B is changed from 5 Ω to 10 Ω, his next operation is ()

A. Record the readings of the ammeter and voltmeter

B. Adjust the sliding rheostat

C. Reduce the number of batteries

D. Increase the number of batteries

4. When exploring the relationship between the voltage across the resistor and the current passing through the resistor, Xiaodong chose two fixed-value resistors R1 and R2 to conduct experiments respectively. Based on the experimental data, he drew the image as shown in the figure. Please follow the The image compares the sizes of resistors R1 and R2, then R1______ (optional "greater than", "equal to" or "less than") R2.

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"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 4:

"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 4 Knowledge Preparation You must still remember: 1. Voltage is the cause of _______. 2. Resistance represents the resistance of a conductor to ________. Question: So the current flowing through a conductor is related to the...

"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 3:

"Scientific Inquiry: Ohm's Law" Exploring Circuit PPT Courseware 3 Review What did we learn in the last lesson? 1. Resistance 2. Factors affecting resistance 1. Cross-sectional area of ​​the conductor 2. Length of the conductor 3. Material of the conductor 4: Sliding varistor can play a role in the circuit...

"Scientific Exploration: Ohm's Law" Exploring Circuit PPT Courseware 2:

"Scientific Exploration: Ohm's Law" Exploration Circuit PPT Courseware 2 Ohm's Law and its Application 1. Content: The current in a conductor is _____ to the voltage across the conductor and _____ to the resistance of the conductor. 2. Formula: I=U/R The meaning and unit of each letter in the formula are: U voltage _____( ..

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Update Time: 2024-11-14

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