"Exploration-Factors Affecting Conductor Resistance" Simple Circuit PPT Courseware 3

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"Exploration-Factors Affecting Conductor Resistance" Simple Circuit PPT Courseware 3

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Factors affecting resistance size

The resistance of a conductor is a ______ of the conductor itself. Its size is related to the ______, ______ and ______ of the conductor. Conductors made of the same material with the same thickness have a greater resistance if their length is ______; Conductors made of the same material with the same length have a cross-sectional area of ​​______ and have a smaller resistance

Resistance and temperature

In addition to being affected by its own factors, the conductor resistance is also related to______

superconductor

When the temperature drops to a certain temperature, the resistance of the substance becomes zero. This phenomenon is called ______ phenomenon. The substance that can produce ______ phenomenon is called ______

Research process of factors affecting resistance size

Take nickel-chromium alloy wires and manganese-copper wires with the same length and cross-sectional area and connect them in the circuit

The current passing through the manganese copper wire is large, indicating that the resistance of the manganese copper wire is small

Take nickel-chromium alloy wires of the same length and different cross-sectional areas and connect them in the circuit

The current passing through the nichrome wire with a large cross-sectional area is large, indicating that the resistance of the nichrome wire with a large cross-sectional area is small

[Example] Under the condition of a certain temperature, when doing the experiment of "studying the factors that determine the size of resistance", the method of controlling variables was adopted, that is, two suitable wires were selected each time, the currents passing through them were measured, and then compared. get conclusion. The table below shows the wires used in the experiment.

Conductor code A B C D E F G

Material manganese copper tungsten nickel chromium wire manganese copper tungsten manganese copper nickel chromium wire

Length/m 1.0 0.5 1.5 1.0 1.2 1.5 0.5

Cross-sectional area/mm2 3.2 0.8 1.2 0.8 1.2 1.2 1.2

(1) In order to study whether the wire resistance is related to the material, the two wires that should be selected are _________.

(2) In order to study whether the wire resistance is related to the length, the two wires that should be selected are _________.

(3) In order to study whether the conductor resistance is related to the cross-sectional area, the two wires that should be selected are ________.

Analysis: This question examines the factors that affect the size of the resistor. The factors that affect the resistance include the material, length and cross-sectional area of ​​the conductor. When studying one of the factors, the other factors should be controlled unchanged. Under certain temperature conditions, the factors that affect the resistance of a conductor are the material, length and cross-sectional area of ​​the conductor. If you want to study whether the wire resistance is related to the material, you should choose two wires with the same length and cross-sectional area but different materials; if you want to study whether the wire resistance is related to the length, you should choose two wires with the same material and cross-sectional area but different lengths. Wires; if you want to study whether wire resistance is related to cross-sectional area, you should use two wires of the same length and material but different cross-sectional areas.

1. The resistance of a conductor has nothing to do with which of the following factors ()

A. Material of conductor B. Cross-sectional area of ​​conductor

C.The length of the conductor D.The current in the conductor

2. Regarding the hindering effect of conductors on current flow, the correct statement is ()

A. Only when there is current in a conductor can the conductor have resistance.

B. The resistance of a conductor depends on the magnitude of the current passing through it.

C. Conductor resistance is a property of the conductor itself and has nothing to do with the passing current.

D. The resistance of a conductor is only related to the length of the conductor

3. Which of the following statements is correct ()

A. The resistance of copper wire is greater than that of iron wire

B. Two wires of the same thickness, the longer wire has greater resistance

C. Two wires of the same length, the thin wire has greater resistance

D. At normal temperature, among wires of the same length and made of the same material, the resistance of thin wires is greater.

4. Resistance is a type of ________ of the conductor itself, and its size is determined by the ________, ________, and ________ of the conductor.

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"Exploration-Factors Affecting Conductor Resistance" Simple Circuit PPT Courseware 2:

"Exploration-Factors Affecting Conductor Resistance" Simple Circuit PPT Courseware 2 Do you know? 1. Common wires in life are mostly copper cores and aluminum cores. Why not use iron cores? 2. Why are some wires thicker? Are there thinner wires? Which electrical appliances do they relate to?

"Exploration-Factors Affecting Conductor Resistance" Simple Circuit PPT Courseware:

"Exploring Factors Affecting the Resistance of Conductors" Simple Circuit PPT courseware to experience the activity of comparing the resistance of conductors at room temperature: Prepare iron wires, copper wires, two batteries, ammeters, and wires of different lengths and thicknesses. Connect them to the circuit as shown in the figure to observe the current representation. Are the numbers similar?

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Update Time: 2024-07-07

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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