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

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"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? What electrical appliances are they connected to?

3. Why are some electric stove wires long? Are some electric stove wires short?

1. Resistance of conductor at normal temperature

What factors do you think affect the size of the resistor?

Material

length

Thickness

temperature

(1) Explore the relationship between conductor resistance and length

Which two conductors would you choose for the experiment?

[Experimental Plan]

Explore the relationship between conductor resistance and length.

The control invariants are __＿, __＿, __＿.

Experimental results:

For conductors of the same material and thickness, the greater the length, the greater the resistance.

(2) Study the relationship between the resistance and thickness of the conductor

Which two conductors would you choose for the experiment?

[Experimental Plan]

Study the relationship between the resistance and thickness of a conductor

The control invariants are __＿, __＿, __＿.

Experimental results:

Conductors of the same material and length, the thicker they are, the resistance is ____.

2. The resistance of a conductor is affected by temperature

[Discuss]

Can you design an experiment to explore the relationship between conductor resistance and temperature?

Conclusion: The higher the temperature of a metal conductor, the greater the resistance; the lower the temperature, the smaller the resistance.

Superconductivity:

When the temperature drops to a certain level, the resistance of some materials disappears.

According to research, the resistance of metal conductors is also related to temperature.

As the temperature increases, the resistance of metal conductors increases.

As the temperature decreases, the resistance of metal conductors decreases.

When the temperature of some materials drops to a certain level, the resistance will suddenly disappear. This is the phenomenon of superconductivity. Conductors with superconductivity are called superconductors.

Using the principle of superconductivity, the magnetic levitation train appeared.

practice

1. Regarding the size of the wire resistance, which of the following statements is correct (the effect of temperature on resistance can be ignored) ( )

A. The larger the cross-sectional area of ​​the wire, the smaller the resistance.

B. For wires with the same cross-sectional area, long wires have greater resistance.

C. For wires of the same length, thin wires have greater resistance

D. Wires of the same length made of the same material, thick wires have smaller resistance

2. When doing the experiment of "researching the factors of resistance size", in order to facilitate the research, the method of controlling variables is used. Each time, two suitable wires need to be selected, the current passing through them is measured, and then compared, and finally a conclusion is drawn. .

(1) In order to study the relationship between resistance and conductor materials, the two wires that should be selected are ______;

(2) In order to study the relationship between resistance and conductor length, wire C and wire ______ should be selected;

(3) In order to study the relationship between resistance and ______, wire A and wire D should be selected.

What have you gained?

1. Learned to use the controlled variable method when studying the relationship between one physical quantity and multiple physical quantities.

2. Know that the factors that determine the size of a resistor include length, thickness, material and temperature.

3. Understand the development history of superconductor research and the fact that our country’s research on superconductors is at the forefront of the worldview.

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

"Exploring - Factors Affecting the Resistance of a Conductor" Simple Circuit PPT Courseware 3 Project Main Content Factors Affecting the Resistance The resistance of a conductor is a kind of ______ of the conductor itself. Its size is related to the ______, ______ and ______ of the conductor. Same thickness...

"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: 2024-11-17

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

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