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

The diameter of the cross section of the nickel chromium wire is D, and the cross section area is S1 = 14 π D2. According to the mathematical knowledge, the cross section area after the diameter changes is S2 = S1100. Because the volume of the nickel chromium wire remains unchanged, the length becomes 100 times of the original. According to the resistance law r = ρ ls, the resistance is 10000 times of the original, that is 10000r

43) a resistance wire of uniform thickness and thickness, with a resistance of 48 ohm. At that time, it was cut into n sections, and then the n sections of the resistance wire were combined into a strand. The measured resistance was 3 ohm, n=

When the resistance is folded and combined, the resistance will become half of the original
So 48 / 2 ^ n = 3 gives n = 4

A wire of uniform thickness has a resistance of 9 ohm. Divide it into three parts, each part has a resistance of () and mix them together. The total resistance is ()
It's coming soon

Three, one

How to understand Ohm's law and resistance? What's the relationship between left and right sliding rheostat and current and voltage
It's a bit slow to master. I hope to explain it in detail

In fact, the idea of the topic is: first, when you move the slide, the resistance of the access circuit becomes larger or smaller; then: if the resistance becomes larger, the corresponding total current decreases; otherwise, the total current becomes larger; finally: apply Ohm's law to the constant resistance in the circuit, that is, the current and voltage are positive

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