"Resistance" Voltage resistance PPT download

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"Resistance" Voltage resistance PPT download

Part One: Learning Objectives

1. Understand the concept of resistance and know that resistance is a property of the conductor itself; be able to draw the symbol of resistance in a circuit diagram, and know the unit of resistance and its unit conversion.

2. Be able to use the control variable method to explore the factors that affect the resistance; understand that the resistance is related to the material, length, cross-sectional area and temperature of the conductor.

Resistance PPT, Part 2: Observation and Thinking

Experiment 1: Connect copper wires and nichrome wires of the same length and thickness to the circuit respectively, close the switch, and observe the brightness of the small bulb in the circuit.

Experiment 2: In the above experiment, connect the ammeter, observe the changes in the ammeter's indication, and continue to observe the brightness of the small light bulb.

When the copper wire is connected to the circuit, the ammeter will read larger and the small bulb will be brighter;

When the nickel-chromium alloy wire is connected to the circuit, the ammeter indicates a smaller value and the small bulb becomes darker.

Under the same voltage, the current passing through the copper wire is larger than that of the nickel-chromium alloy wire. Why is there this difference?

Although conductors easily conduct electricity, they also have a certain hindrance to current flow.

Under the same voltage, the current passing through the copper wire is relatively large, indicating that the copper wire has a relatively small obstruction to the current;

The current passing through the nichrome wire is relatively small, indicating that the nichrome wire has a relatively large obstruction effect on the current.

Resistance PPT, part three content: 1. Resistance

1. In physics, resistance is used to represent the resistance of a conductor to current flow.

The greater the resistance of a conductor, the greater its resistance to current flow.

The resistance of a conductor is usually represented by the letter R.

2. Unit: ohm (ohm), referred to as ohm, symbol Ω.

3. The units of resistance are: megaohm (MΩ) kiloohm (kΩ). The conversion relationship is:

1 kΩ = 1000 Ω = 103 Ω

1 MΩ = 1000000 Ω=106 Ω

4. Resistor: In electronic technology, we often use components with a certain resistance value - resistors, also called fixed-value resistors, or resistors for short. It is represented by the symbol ________ in the circuit diagram.

Resistance PPT, part 4 content: 2. Explore the factors that affect the size of the resistance

Under the condition of certain materials, what other factors are related to the resistance?

The size of the resistance may be related to the length of the wire;

The size of the resistance may be related to the thickness of the wire;

other factors.

Experimentation and inquiry

1. Explore the relationship between resistance and conductor materials

2. Explore the relationship between resistance and conductor length

3. Explore the relationship between resistance and conductor cross-sectional area

4. Explore the relationship between resistance and temperature

The resistance of a conductor is related to temperature. The higher the temperature, the greater the resistance.

Resistance PPT, part 5: in-class training

1. As shown in the figure, it is a circuit to study whether the resistance of a conductor is related to the conductor material. In addition to the same length of wires AB and CD, the following conditions should be met: ()

A. Different cross-sectional areas and different materials

B. Same cross-sectional area but different materials

C. Different cross-sectional areas, same materials

D. Same cross-sectional area and same material

2. The resistance of a conductor is a property of the conductor itself, its size ()

A. Depends only on the material of the conductor

B. Depends only on the length of the conductor

C. Determines only the cross-sectional area of ​​the conductor

D. Determined by the material, length and cross-sectional area of ​​the conductor

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Update Time: 2024-11-29

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