Is the electron velocity and resistance and voltage positively or negatively correlated

The power of the body velocity is proportional to the voltage.

The main components in the pencil lead are graphite and clay, and the conductive component is graphite, and graphite and hardness are inversely proportional, so it can be proposed to assume that the resistance is proportional to the hardness (the higher the hardness, the lower the graphite content, the worse the conductivity) Experimental steps:1Find pencils with different hardness (6h, 5h, 4h, 3h, 2h, h, hb, b, 2b, 3b, 4b, 5b, 6b, 8b, 10b, etc.) to ensure that the diameter and length of their refills are the same (because the resistance is also related to the cross-sectional area and length, so as to ensure that the difference in resistance is caused by hardness, which is called the control variable method) 2

Using voltammetry, the current i of the same pencil is measured at different voltages U (1V, 2V, 3V), and the average resistance is 3Replace the pencils and repeat operation 2 to measure the resistance of all pencils r4List **, so that the hardness is gradually reduced (6h, 5h, 4h, 3h, 2h, h, hb, b, 2b, 3b, 4b, 5b, 6b, 8b, 10b), and observe the change of the corresponding resistance 5

The conclusion of the experiment is obtained

If there is no resistor, the two power supplies are in parallel state, and when the actual regulated power supply is connected in parallel, the output is the one with high voltage; When you add a 1k resistor, the voltage will be pulled to the voltage of v4 due to the effect of the v4 internal load resistor, that is, 2v; Remove V4, its internal load resistance is gone, the internal resistance of the meter is very large, so the display voltage of the table is V3 voltage 12V

Electrons do an accelerated motion in the electric field with an initial velocity of 0. Let the voltage be u, the electron mass be m, the final velocity be v, and the amount of charge qThen it is determined by the kinetic energy theorem uq = mv 2 2 v = (2uq m) electron mass m

The amount of charge q is constant, so v is only related to the voltage u, and the larger u is, the greater v is, but not proportional.

Not exactly. The expression for velocity v can be calculated: let s be the cross-sectional area of the conductor, n be the number of charges carried by the conductor per unit volume, e be the amount of charge per unit charge, and the quantity q can be expressed as:

Q=nesvt (this is very important, you push it down yourself, if you don't understand, just ask me) and then i=q t i=nesv v=i (nvs)=u (rnes).

First of all, we must understand the nature of the current, when voltage is added to both ends, the whole path will be filled with electric field, and the electrons themselves will flow very slowly, and as you said, the greater the resistance, the more difficult it is for the electrons to move. However, since the electric field is generated at the speed of light, all electrons in the entire circuit will start to move in a very short period of time in the electric field transmitted at the speed of light, and in general, the current is generated instantaneously. Therefore, no matter how large the resistance is, the current always runs at the speed of light from the perspective of the entire circuit, which means that the generation and flow of current is always instantaneous.

Hello! The condition of giving the voltage is true.

When the voltage is the same, the resistance is large, the current is small, then the amount of electricity q it can know, in the same time, the resistance is larger, the amount of electricity passing through is smaller, so the electrical appliances with the large resistance are more energy-efficient.

The answer upstairs is that the speed of propagation of electricity is indeed the speed of light, but you are asking about the amount of electricity that passes through a unit of time, that is, the current resistance is large, and the current is small at the same voltage, that is, the charge passing through the same unit time, and the same electric energy is used, which is the longest time.

Similarly, a 5W bulb can last for 200 hours for a kWh of electricity, and a 200W bulb can only last for 5 hours.

Resistance of 5W bulb》Resistance of 100W bulb).

1. Resistance:

Resistors are generally directly referred to as resistors in daily life. It is a current limiting element, after the resistor is connected to the circuit, the resistance value of the resistor is fixed, generally two pins, which can limit the current through the branch it is connected to.

2. Rated voltage:

The rated voltage refers to the optimal voltage when the electrical equipment is working normally for a long time, and the rated voltage is also known as the nominal voltage. When the working voltage of electrical equipment is higher than the rated voltage, it is easy to damage the equipment, and when it is lower than the rated voltage, it will not work normally.

It does not matter. The change in resistance does not change the rated voltage; When the resistance is constant, changing the rated voltage will not affect the resistance value of the resistor.

Resistance and voltage rating are two different concepts in themselves, resistance can be an element or a physical quantity, whereas rated voltage is just a physical quantity. And the resistance definitely refers to the load, while the rated voltage refers to the power supply.

If for the resistor (that is, the load), the change of the resistance value will affect the voltage (or voltage drop) change due to the current change in the circuit, this voltage (not the rated voltage) is proportional to the current flowing through the resistance, and the change in the size of the resistance forms an inverse proportional relationship change, that is, the current becomes smaller when the resistance increases, and the voltage drop on the resistor becomes smaller, otherwise the vice versa.

If the maximum voltage is not indicated, the rated voltage is the maximum operating voltage of the resistor, and when the resistor is working, the two ends cannot exceed the rated voltage, otherwise, it may lead to the breakdown of the resistance insulation.

If the highest voltage is marked, the maximum voltage is generally higher than the rated voltage, and it can be operated for a short time, and the rated voltage can only prevail for a long time.

There is no direct relationship between the two. Resistance and voltage rating are intrinsic properties and are not directly related.

For electrical appliances of the same power, the higher the rated voltage, the greater the resistance. Because p=u2r.

For example, both are 40W incandescent lamps, and the rated voltage of 220V is much larger than that of 24V, and the difference is obvious when looking at the thickness of the filament.

If you do not display the maximum voltage, the rated voltage runs at the highest voltage of the resistance, the resistance must not exceed the rated voltage at both ends, otherwise, it may cause the resistance insulation breakdown. The maximum voltage marked and the maximum voltage are generally higher than the rated voltage, and you can run the only rated voltage for short-term and long-term operation.

This is a matter of reference direction selection, either positive or negative or positive or positive. But we have a habit of choosing the non-correlated direction for the general power supply and the non-correlated direction for passive components. Because in general, when a single power supply is used, the actual direction of the current always flows out from +, so the voltage and current are always positive after selection.

Purely habitual.

UIS only refers to the voltage direction, and the true direction must be solved.

uis - is * r1 + r2//r3）+ us = 0

Hello, happy with your question.

I don't quite understand what you mean, but I think you have some misconceptions about electricity. In fact, the current transfer in the conductor does not depend on the directional motion of electrons, the directional motion of electrons is actually very slow, and the current is actually transmitted by electromagnetic fields, which is about 3*10 8m s. Due to this great speed, the electromagnetic field is instantaneously transmitted through the conductor, and all the currents in the conductor begin to move directionally almost instantaneously, and then the current is generated.

Upstairs is already nice.

The current and the flow of water are fundamentally different, the flow of water has to move along the track step by step, while the current can"Synchronize movements"Yes, the electrons in that position have already started to move before the electrons in the back reach that position, but I put the synchronous movement in quotation marks, because there is still a delay in this phenomenon, and the speed of the delay is the speed of light.

For example, if you have a wire 3*10 8m long, after a quarter of a second after adding voltage, the electrons from one end have only traveled a short distance, but the electrons at a quarter of the wire have been affected by the electric field and have begun to move directionally. The electrons of the remaining part of the wire are not affected in any way.

So regardless of whether the resistance is large or small, the speed of propagation of electric current is always the speed of light.

For potentiometers with buffer output, the output is a voltage value, not a resistance value, and if you choose not to have a buffer, it is a resistor.

Voltage series negative feedback should be introduced. Negative voltage feedback stabilizes the output voltage, and series negative feedback increases the input resistance.

Battery depletion is manifested by the inability of negatively charged electrons to reach the negative electrode from the positive electrode, and the inability of the positive charge to reach the positive electrode from the negative electrode. The potential difference between the positive and negative poles can no longer be established. In addition, because the chemical substances are exhausted and the electrolyte is also used up, the internal substances of the battery have a particularly large obstruction effect on the current, that is, the internal resistance is large, and the power is not on.

2. Why can the resistor adjust the current? i=u/r。The resistance of the electric mass is the magnitude of the conductor's resistance to the current, and the resistance is larger, which can be seen by i=u r, and the current is small.

3. The positive end is the atom that is electrically neutralized, and the negative end is the negative electricity, will there be voltage? This sentence may not make sense. Will I give you after I make it clear?

4. Other conditions remain unchanged at the end of the year, is it true that the greater the voltage, the faster the electrons move? 【Yes】Is there any change in the magnitude of the current? [Yes, the higher the voltage, the greater the current].

5. Does the closed circuit consume a lot of electricity? Why? The electrical energy consumed by the circuit is related to the size of the electrical appliances accessed, and the more electrical appliances are connected, the more electric energy is consumed.

The more electrical appliances used in the circuit access, the smaller the total resistance r, and the greater the electrical power consumed by the power supply by p=e 2 (r+r).

In a pure resistive circuit, the voltage is proportional to the resistance. This is stated by Ohm's law.

In fact, resistance is an intrinsic property of matter, even if it is not electrified, resistance still exists, and the magnitude of the resistance is affected by the material of the substance, temperature, and shape.