"Resistance" Voltage Resistance PPT Courseware 6

Description

"Resistance" Voltage Resistance PPT Courseware 6

Positive thinking

1. Why should the conductors be made of copper wire?

2. Iron can also conduct electricity, why not use cheap iron wire?

learning target

1. Know what resistance is and understand that resistance is a property of the conductor itself.

2. Know the units of resistance and their conversion.

3. Understand that the size of resistance is related to the material, length, and cross-sectional area of ​​the conductor.

1 Resistor—R

Resistance - the degree of resistance of a conductor to current flow is a property of the conductor itself

In the International System of Units, the unit of resistance is "ohm", the abbreviation is ohm, and the symbol is "Ω".

There are also kilohms (ΚΩ) and megaohms (ΜΩ).

1ΚΩ＝1000Ω 1ΜΩ＝1000ΚΩ

The resistance of the small light bulb used in the experiment: several ohms---more than ten ohms;

The resistance of a copper wire 1 meter long is less than a few percent of ohms. The resistance of the small light bulb used in the experiment is 500 times the resistance of each wire. The resistance of the wires can be ignored.

2. Factors that determine the size of the resistor

Conjecture 1: The resistance of a conductor may be related to the material of the conductor

Conjecture 2: The resistance of a conductor may be related to the length of the conductor

Conjecture 3: The resistance of a conductor may be related to the thickness of the conductor

Conjecture 4: The resistance of a conductor may be related to the temperature of the conductor

1. 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. Explore the relationship between conductor resistance and thickness.

Experimental results:

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

3. Explore the relationship between conductor resistance and materials.

Experimental results:

For conductors of the same length and thickness, the resistance is related to the material.

【summary】

1. Resistance is a property of _____.

2. The resistance of the conductor is related to the conductor’s __, __, and __

3. For the same material, the longer the conductor and the smaller the cross-sectional area, the resistance of the conductor will be ____.

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

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Update Time: 2024-11-24

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

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