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Authoritative PPT Summary
"Rheostats" Voltage and Resistance PPT Courseware
conductors and insulators
Conductor: An object that is good at conducting electricity.
Insulator: An object that is not good at conducting electricity
The charge is almost all bound within the atomic range and there is almost no free charge
There are a large number of free charges in the conductor. Under the action of voltage, the free charges move in a direction to form an electric current, so the conductor can conduct electricity.
resistance
1. Definition: A physical quantity that expresses the obstruction effect of a conductor on current flow.
2.Unit:
(1) International unit: ohm, referred to as ohm, symbol Ω
(2) Commonly used units: kiloohms (KΩ), megaohms (MΩ)
(3) Conversion relationship:
1KΩ=103Ω
1 MΩ=106Ω
3. Resistor symbol:
Explore the factors that determine resistance size
Ask the question: What factors are related to the resistance of a conductor?
Guess assumptions: material, length, cross-sectional area
Designing Experiments: Controlled Variables Method
conduct experiment:
Analysis and demonstration: (1) The resistance of a conductor is related to the material of the conductor.
(2) For conductors of the same material and the same cross-sectional area, the longer the conductor, the greater the resistance.
(3) For conductors of the same material and length, the smaller the cross-sectional area, the greater the resistance.
Communication Assessment:
Further research showed that the resistance of a conductor is also related to temperature. The resistance of most metals increases with temperature. The resistance of a light bulb when it is normally emitting light is much greater than when it is not emitting light.
summary
The resistance of a conductor is a property of the conductor itself and is only related to the material, length, cross-sectional area and temperature of the conductor.
It has nothing to do with the voltage applied across the conductor and the current flowing through the conductor.
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