"Resistor" voltage resistance PPT courseware download

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"Resistor" voltage resistance PPT courseware download

Part One Content: A Classification Practice of Knowledge Key Points

Knowledge point 1 Resistor

1. Resistance represents the _________ effect of the conductor on the current. The greater the resistance of the conductor, the greater the _____________ of the conductor on the current. Different conductor resistances generally _________. The resistance of a conductor is usually represented by the letter ________. The unit of resistance is ________, referred to as ________, and the symbol is ________.

2. Complete the following unit conversions.

(1)0.3 kΩ=________Ω=________MΩ.

(2)1600Ω=__________MΩ=___________kΩ.

3. Connect copper wires and nichrome wires of the same length and thickness to the circuit shown in Figure 16-3-1. When ________ is connected to the circuit and the switch is closed, the small bulb will be brighter. , which means that the resistance of ____________ is greater. Of the two materials, ________ is more suitable for wires. (Please fill in "Copper Wire" or "Nichrome Wire")

Knowledge point 2 Factors affecting the size of resistance

4. The students are doing an experiment to "explore what factors are related to conductor resistance."

(1) As shown in Figure 16-3-2, compare the 1st, 2nd, and 3rd groups of wires and find that ________, ________, and ________ are different between them respectively; the students guessed that the resistance of the conductor may be different from that of the conductor. It is related to factors such as ________, ________, and ________.

(2) How to compare the resistance of conductors? Xiao Ming believes that under the same conditions, the smaller the resistance of a conductor, the greater the current passing through it. From this, he thought of comparing the resistance by the ________ indicator in series with the conductor.

(3) When exploring the question "What factors are related to the resistance of a conductor?", the teacher guided the students to conduct the following experiment: During the experiment, the students connected four metal wires a, b, c, and d to the circuit respectively. The research status is as follows:

①When ________ two metal wires are selected, the relationship between the conductor resistance and the conductor cross-sectional area can be explored.

② When two metal wires a and d are selected, the relationship between the conductor resistance and the conductor ________ can be explored.

③When choosing _____ two metal wires, the relationship between the conductor resistance and the conductor material can be explored.

5. Use a power supply, light bulb, wire, switch and tungsten filament to form a circuit as shown in Figure 16-3-3. Close the switch and the small light bulb will light up. Then use an alcohol lamp to heat the tungsten filament. You will find that the brightness of the light bulb dims because of the tungsten filament. As the temperature of the wire increases, its resistance becomes ________.

6． When the temperature is constant, regarding the resistance of the two copper wires, which of the following judgments is correct ()

A． Thin ones have large resistance

B． Longer ones have greater resistance

C. The thickness is the same, the longer one has greater resistance.

D. Same length, thicker one has greater resistance

Resistance PPT, part 2: Comprehensive practice of B-law method

9. In order to protect the rights and interests of consumers, a technical quality supervision department conducted spot checks on wire products on the market and found that the diameter of the copper core in a certain brand of wire was significantly smaller than the diameter specified in the wire specification, causing the resistance to be too high. Analyzing the factors that affect the conductor resistance, the main reason why the resistance of this wire does not meet the specifications is ()

A． The length of the wire b. cross-sectional area of ​​wire

C. The material of the wire D. wire temperature

10. You are given two nichrome wires of the same length but different cross-sectional areas, a power supply, an ammeter, a switch, and several wires. The topics that need to be studied are:

①The relationship between the resistance of a conductor and its cross-sectional area;

②The relationship between the resistance of a conductor and its length;

③The relationship between the resistance of a conductor and its material.

The research topics that can be completed using the above experimental equipment include ()

A． Only ① B. Only ②

C. ① and ② D. ①②③ are available

11. In order to compare the conductive properties of different materials, Xiao Ming designed the circuit diagram as shown in Figure 16-3-4. He connected the four materials between A and B respectively. The observed current expression and the light bulb luminescence were recorded in the following table. Which of the following substances has the strongest electrical conductivity? ()

A.Saline water B. Soy sauce C. vinegar d. peanut oil

12. A copper wire of uniform thickness has a resistance of R. If it is cut into two sections of the same length, and the resistance of each section is R1, then R1_______R; if the original wire is folded and twisted into one, its resistance is R2, then R2_______R. (Please fill in “＜” “＞” or “=")

13. After learning about electricity, Xiao Ming further explored some of the factors that affect the resistance. The equipment included: a switch, an ammeter, a power supply (the voltage is always 1.5 V), three identical alloy wires, and several wires. Connect the circuit as shown in Figure 16-3-5A. Connect the alloy wire between circuits A and B in different ways. After closing the switch S, record the data as shown in the table below.

Answer the following questions:

(1) Picture B shows the reading of the ammeter when an alloy wire is connected to the circuit. Please fill it in the table.

(2) The relationship between the conductor resistance and the conductor’s material, length, and cross-sectional area:

A． The relationship between the size of the resistor and the length is_______________________________________________;

B． The relationship between the size of the resistor and the cross-sectional area is_________________________________________.

(3)The purpose of conducting multiple measurements is ____________________.

Resistance PPT, the third part: Practical practice of C high-frequency examination questions

14. [2017·Guangxi]As shown in Figure 16-3-6, a pencil lead is connected to the circuit through two clips. When only the right end clip is moved to the left, the pencil lead is connected to the circuit. The resistance becomes smaller and the small bulb becomes brighter. The main factor that causes the resistance of the pencil lead to be connected to the circuit to become smaller is ()

A． Materials b. length

C. temperature d. Cross-sectional area

15． [2016·Hezhou] As shown in Figure 16-3-7, in the experiment of "exploring factors affecting the resistance of conductors", wires a, b, and c have the same thickness, while wires b and d have different thicknesses; a , b, and d have the same length. (a is manganese-copper alloy, b, c, d are nickel-chromium alloy)

(1) This experiment is to indirectly compare the resistance of wires by observing the indication of ________.

(2) The purpose of selecting wires a and b to be connected to the circuit separately is to explore the relationship between the resistance size and the _________ of the conductor.

(3) The purpose of selecting wires b and c to be connected to the circuit separately is to explore the relationship between the resistance size and the _________ of the conductor.

(4) The purpose of selecting wires to connect to the circuit separately is to explore the relationship between the resistance size and the cross-sectional area of ​​the conductor.

(5) In addition to the above factors, the conductor resistance may also be related to ________.

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Update Time: 2024-06-24

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