![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
What determines the resistance? What determines the size of the resistance?
The factors that determine the resistance are: material, length, cross-sectional area and temperature
When the other three conditions are the same:
The longer the length, the greater the resistance
The larger the cross-sectional area, the smaller the resistance
The higher the temperature of most conductors, the greater the resistance
If only three blanks are given, fill in: material, length and cross-sectional area
If four blanks are given, fill in: material, length, cross-sectional area and temperature
Factors determining the resistance of conductor
Factors: conductor material, length, cross-sectional area
Function: 1. Protection circuit 2. Change the current in the circuit
Through the experimental study, we can know that the resistance of the conductor is a property of the conductor itself, and its size depends on the resistance of the conductor______ 、______ 、______ And______ ．
The resistance of an electric body is a property of the conductor itself. Its size depends on the material, length and cross-sectional area of the conductor. Moreover, the resistance is also related to temperature. Therefore, the answer is: material; length; cross-sectional area; temperature
What factors do resistance have to do with conductors
Equipment: one fine nickel chromium alloy wire, one manganese copper alloy wire (about one meter long), one switch, one ammeter, one sliding rheostat, one power supply and several conductors
Design experiment
Connect two wires in the circuit respectively, and observe the indication of the ammeter. If the indication is small, the resistance is large, which can prove that it is related to the material of the resistance
RELATED INFORMATIONS
- 1. The resistance of a conductor is related to which three factors of the conductor. For the same material, the longer the conductor is and the smaller the cross-sectional area is, the greater the resistance of the conductor is?
- 2. Will the parallel diode or resistance of the relay coil affect the overall resistance?
- 3. Under what circumstances are relay coils connected in parallel with resistors and capacitors
- 4. The resistance of metal conductor increases with the increase of temperature? Why? Is it necessary to add something in front?
- 5. Relationship between resistance and temperature
- 6. The relationship between resistance and temperature?
- 7. What is the resistance of a 10 meter long aluminum conductor with a cross-sectional area of 240 square mm? How to calculate it?
- 8. I would like to know the resistance, 1 ohm and 10 ohm, which is bigger. Why
- 9. There are three sections of copper wire with equal diameter, uniform thickness and length of a cm, B cm and C cm respectively. The resistance of a CM copper wire is 20 ohm and the length of a CM copper wire is 20 ohm The resistance of copper wire of C cm is 30 ohm. If three copper wires can form a triangle, try to find the value range of resistance of copper wire of B cm length (the resistance of copper wire is proportional to the length of copper wire)
- 10. What is the voltage after a diode is connected in series with 220 V AC? What is the fast voltage after a bridge ballast is connected in series
- 11. Junior high school physics electricity to explore the factors affecting the size of conductor resistance The resistance is related to the material, length and cross-sectional area of the conductor. I want a metaphor to make me understand it better For example, the cross-sectional area of a conductor is the thickness of the conductor. It is compared to a road. A wide road is more unobstructed than a narrow road, so the resistance with a thick cross-sectional area is smaller, so the brightness of the light bulb is brighter. I don't know how to understand the other two factors. If there is a metaphor, I don't want to memorize it
- 12. How to calculate the parallel resistance of an ammeter with a range of 100ua and an internal resistance of 1K Ω instead of 1.1ma
- 13. There is a DC power supply whose internal resistance can be neglected to deliver current to the series resistor A. B. when the 90 ohm resistor a is short circuited, the current in the circuit is four times that before the short circuited, then the resistance value of the resistor B is?
- 14. As shown in the figure, the voltage at both ends of the power supply remains unchanged, and the resistance value of resistance R1 is 2 Ω. Close switch S. when slide P of sliding rheostat is located at point a, the indication value of voltmeter V1 is 4V, and that of voltmeter V2 is 10V. When slide p of sliding rheostat is located at point B, the indication value of voltmeter V1 is 8V, and that of voltmeter V2 is 11V______ W．
- 15. In the circuit shown in the figure, close the switch s and move the slide P of the sliding rheostat. When the indication of the voltmeter is 6V, the indication of the current is 0.5A; when the indication of the voltmeter is 7.2V, the indication of the ammeter is 0.3A. Then the resistance R0 is 0______ Ω, the power supply voltage is______ V．
- 16. As shown in the figure, the voltage at both ends of the power supply does not change, and the resistance value of resistance R1 is 2 Ω. Close the switch S. when the slide P of sliding rheostat is at point a, the indication value of voltmeter V1 is 4V, and that of voltmeter V2 is 10V. When the slide P of sliding rheostat is at point B, the indication value of voltmeter V1 is 8V, and that of voltmeter V2 is 11V. Then the resistance value of resistance R2 is 4V___ Ω．
- 17. When a student was doing the experiment of measuring the resistance of a small light bulb, he connected the circuit, closed the switch and found that the light bulb did not emit light (1) When doing the experiment of measuring the resistance of a small bulb, a student connected the circuit, closed the switch, and found that the bulb did not emit light, the ammeter showed the number, and the voltmeter did not show the number. After inspection, it was found that there was only a fault at the bulb, so the reason for the above phenomenon may be () (2) When doing the experiment of measuring the resistance of a small bulb, a student connected the circuit and closed the switch. He found that the bulb was not on, the ammeter did not show the number, and the voltmeter had a large number. The reason for the above phenomenon may be () Urgent, must tell me why, by the way, short circuit, open circuit and other differences
- 18. When a uniform nickel chromium wire is drawn into a uniform wire of 110 in diameter, its resistance becomes n times of the original, then n is () A. 11000B. 1100C. 100D. 10000
- 19. A uniform thickness metal wire is stretched to twice the original length and cut into two sections, one of which is resistance A wire of uniform thickness is drawn twice as long as the original wire and cut into two sections from the middle, one of which has a resistance of -
- 20. The resistance of a uniform wire will be cut into two equal sections and the two sections will be twisted together