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Authoritative PPT Summary
"Relationship between Current, Voltage and Resistance" Ohm's Law PPT
Part One: Guidance Design
Learning Point 1: Quantitatively understand the relationship between current, voltage, and resistance
Question 1: When the resistance is constant, the higher the voltage applied to both ends of the conductor, the more ______ the current in the conductor is; when the voltage is constant, the greater the resistance of the conductor, the more ______ the current in the conductor is.
Question 2: What do you think is the quantitative relationship between the current flowing through a conductor and the resistance of the conductor and the voltage applied across it? answer______________________________________________________________________.
[Instruction] Quantitative analysis refers to analyzing the quantitative relationship between the components contained in a research object or the quantitative relationship between its properties. It can also analyze certain properties, characteristics, and mutual relationships of several research objects. Analyze and compare quantitatively, and the results of the research are also described in terms of "quantity".
Learning point 2: Explore the relationship between current and voltage
Experimental design: Please follow the prompts to complete the design of this experimental circuit diagram.
Method 1: Image method. The obtained data is plotted into a graph, and the changing relationship between current and voltage is analyzed through the graph.
Method two: calculation method. The obtained data is processed and the relationship between current and voltage is analyzed using the ratio of voltage value to current value.
Learning point 3: Explore the relationship between current and resistance
Experimental design: Please follow the prompts to complete the design of this experimental circuit diagram.
Method 1: Image method. The obtained data is plotted into a graph, and the changing relationship between current and resistance is analyzed through the graph.
Method two: calculation method. The obtained data is processed and the relationship between current and resistance is analyzed using the product of resistance value and current value.
PPT on the relationship between current, voltage and resistance, part 2: summary of common exams
Type 1: Explore the relationship between current and voltage
Typical Example 1 [Heze High School Entrance Examination] Use the experimental circuit shown in Figure 17-1-14A to explore "the relationship between the current and voltage passing through the conductor".
(1) _____ fixed-value resistors are required in the experiment.
(2) The function of sliding rheostat is ____________________.
(3) The I-U relationship graph made using experimental data is closest to the _____ in Figure B.
[Commentary by Famous Teachers] When judging the relationship between two physical quantities, you should pay attention to the following two points: ① When one quantity changes with the change of another quantity, if the ratio of the two quantities does not change, then the two quantities Proportional; ② When one quantity changes with the change of another quantity, if the product of the two does not change, then the two quantities are inversely proportional.
Type 2: Explore the relationship between current and resistance
Typical Example 2 In the experiment of "exploring the relationship between current and resistance", the experimental equipment provided by the teacher is shown in Figure 17-1-15 (the voltage at both ends of each power supply remains unchanged, and the influence of temperature on each fixed-value resistor can be ignored ). Please choose appropriate equipment to complete the experimental investigation.
(1) What factors do you think the size of the current is related to? answer:________________________.
(2) In this experiment, ______________ needs to be kept unchanged.
(3) Draw the experimental circuit diagram you designed in the dotted box.
(4) A sliding rheostat was used in the experimental plan designed by Xiao Yang. In the experiment, the role that the sliding rheostat cannot play is ________ (fill in only the serial number before the option).
A． Control the current in the circuit and protect the circuit
B． Keep the voltage across the fixed-value resistor constant
C. change supply voltage
Type 3 Image method
Typical Example 3 At a certain temperature, the relationship between the current in the two conductors A and B connected in the circuit and the voltage at both ends is shown in Figure 17-1-17
shown. It can be seen from the information in the figure ( )
A． The resistance of conductor A is 10 Ω
B． The resistance of conductor B is 10 Ω
C. When the voltage across conductor A is 3 V, the current through conductor A is 0.3 A
D. When the voltage across conductor B is 3 V, the current through conductor B is 0.6 A
PPT on the relationship between current, voltage and resistance, part three: classroom feedback
1. Because voltage is what causes the directional movement of charges to form current, and resistance is the resistance of the conductor to current, we guess that the size of the current in the conductor should be related to the _________ at both ends of the conductor and the _________ of the conductor. Because it is conjectured that there is more than one factor that affects the magnitude of the current, the ____________ method should be used when exploring the factors that affect the magnitude of the current.
2. Table 1 and Table 2 are the experimental data recorded by Zhang Hua during the experiment to explore the relationship between current, voltage and resistance in the conductor based on the circuit shown in Figure 16-1.
3. In the experiment of studying the "relationship between current and voltage" and "the relationship between current and resistance", the main function of the sliding rheostat is ()
A． Make the voltage across the resistor R change in multiples
B． Keep the voltage across resistor R constant
C. The former keeps the voltage across the resistor R constant, and the latter changes the voltage across the resistor R.
D. The former changes the voltage across the resistor R, while the latter keeps the voltage across the resistor R constant.
[ Analysis When, the voltage across the resistor needs to be controlled to remain constant, so the function of the sliding rheostat is to keep the voltage across the resistor R constant.
4. Among the following images, the ones that can correctly reflect the relationship between the current in the conductor and the voltage and resistance at both ends are ( )
A． ①④ B. ①②
C. ③② D. ③④
[ Analysis The resistance decreases as the resistance increases, that is, the current in the conductor is inversely proportional to the resistance of the conductor, so the IR image is a single curve located in the first quadrant, ④ conforms to the law.
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"Relationship between Current, Voltage and Resistance" Ohm's Law PPT download:
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