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Authoritative PPT Summary
"Resistance" Voltage Resistance PPT Courseware 3
Study Tips:
1. Self-study textbook P63~64 "Resistance" section
Sort out basic knowledge
2. Complete the first part of the study plan
1. Resistance
1. Concept: Indicates the magnitude of the resistance of a conductor to current flow
2. Unit: ohm, referred to as ohm, symbol Ω.
Commonly used units: megaohm (MΩ) kiloohm (kΩ)
Conversion relationship: 1 kΩ=103 Ω 1 MΩ=106 Ω
3. Fixed value resistor: a component with a certain resistance value
Circuit symbols:
[Feedback Exercise 1]
1. As shown in the figure, connect copper wire and nichrome wire to the circuit respectively. It is found that the light bulb is brighter when the copper wire is connected, indicating that the copper wire hinders the current and resists ___.
2. 0.5MΩ=500KΩ=5×105Ω
[Feedback Exercise 2]
1. Regarding the resistance of a conductor, which of the following statements is correct ( )
A. Only when there is current in a conductor can the conductor have resistance.
B． The resistance of a conductor depends on the amount of current flowing through it
C. Conductor resistance is a property of the conductor itself and has nothing to do with the current passing through it
D. The resistance of a conductor is only related to the length of the conductor
2. Data analysis: The resistance values of several metal wires with a length of 1m and a cross-sectional area of 1mm2 at 20oC:
【Feedback detection】
1. (Must do) Which of the following statements is correct ( )
A. The longer the conductor, the smaller its resistance.
B. The thicker the conductor, the greater its resistance.
C. The thinner the conductor, the greater its resistance.
D. When the material and thickness of the conductor are the same, the longer the conductor, the greater the resistance.
2. (Required) Connect a resistance wire with a resistance of 12Ω to the circuit. When the switch S is closed, the current flowing through it is 0.5A, and its resistance is ___Ω. When the switch S is open, the current flowing through it is It is ____A, and its resistance value is ____Ω. If this resistance wire is stretched evenly, its resistance value _____.
(Optional "get bigger", "unchange", "get smaller")
3. (Optional) The picture shown is an experimental device for studying the factors that affect the resistance of a conductor. Conductors of four specifications a, b, c, and d are connected between M and N respectively for research and comparison. What do you think:
To study the relationship between the conductor's resistance and length, wires ____ and ____ should be selected. To study the relationship between the conductor's resistance and cross-sectional area, ____ and ____ should be selected to study the relationship between the conductor's resistance and material. , wires ____ and ____ should be selected
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