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"Resistor" Voltage Resistance PPT Courseware 2
The wires are mostly made of copper, and the wires of particularly important electrical equipment are also made of expensive silver. Iron is also a conductor. It is abundant and cheap. Think about it, why not use iron as a conductor?
Demo 1
Connect copper wires and nickel-chromium alloy 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.
Experimental phenomena
By connecting different conductors, the brightness of the small bulb changes.
Demo 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 bulb.
Experimental phenomena
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.
question
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?
Experimental phenomena
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.
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 also: megaohm (MΩ) kiloohm (kΩ)
The conversion relationship is:
1 kΩ = 1 000 Ω = 103 Ω
1 MΩ = 1 000 000 Ω = 106 Ω
Experimental results
When the material and cross-sectional area are the same, the resistance of the conductor is related to the length. The longer the length, the greater the resistance.
When the material and length are the same, the resistance of the conductor is related to the cross-sectional area. The larger the cross-sectional area, the smaller the resistance.
When the length and cross-sectional area are the same, the resistance of the conductor is related to the material.
Classroom testing
1. A conductor is connected to a 3-volt power supply with a resistance of 10 ohms. If the conductor is removed from the circuit, the resistance of the conductor is _______ ohms.
Analysis: The resistance is 10 ohms, which is a property of the conductor itself. It has nothing to do with whether the conductor is connected in the circuit, whether there is voltage at both ends, or whether there is current in it.
2. 0.2MΩ=_______Ω=______KΩ
3. The length of two copper wires and nickel-chromium alloy wires with the same thickness and equal resistance is ( )
A. The copper wire is longer B. The nickel-chromium alloy is longer
C. Same length D. Unable to determine
4. Regarding the resistance of the conductor, which of the following statements is correct ( )
A. The greater the resistance of the conductor, the smaller the resistance of the conductor to the current.
B. The greater the resistance of the conductor, the greater the resistance of the conductor to the current.
C. Conductor resistance is related to current. The greater the current, the smaller the resistance of the conductor.
D. Conductor resistance is related to current. The smaller the current, the greater the resistance of the conductor.
Class summary
1. In physics, resistance is used to express the resistance of a conductor to current flow.
2. The unit of resistance is ohm, referred to as ohm, symbol Ω.
3. Resistance is a property of the conductor itself. Its size depends on the conductor's material, length, cross-sectional area, and is also affected by temperature.
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