How does resistance actually affect current?

If there is only one resistor in the same circuit, it can be said that it has nothing to do with the voltage. The voltage is only artificially added at both ends of the resistor, and has nothing to do with the size of the resistance. If there are other electrical appliances in the same circuit in addition to this resistor, then it will have an impact on the voltage.

However, its effect only affects the distribution of voltage across the appliance. That is, the greater the resistance, the greater the power supply voltage allocated by the resistor itself, and the smaller the voltage at both ends of other electrical appliances. Essentially, resistors do not hinder voltage.

Resistance is the obstacle of the current, you can analyze it from the micro aspect, the current is a carrier, they pass through the resistance together, just like the road is uneven. <>

Actually, there is no resistance, but conductance. Replace the statement that an object has high electrical conductance with the statement that the electrical conductance of an object is high, and you will find that the idea is suddenly clear. Conductance is a natural property of every object, not resistance.

For example, metals have higher electrical conductivity than rubber because metals have more free electrons. Why does parallel connection improve conductance? This is because there are more free electrons per unit section after paralleling.

Why does series connection reduce current? Because the electric field per unit length becomes weaker. Conductivity is a measure of an object's ability to transmit an electric field and current, and for the same object and its resistance are reciprocal to each other.

So back to the problem, it can be understood that the resistor reduces the number of carriers. Carriers do not have to be negatively charged electrons or can be positively charged holes. <>

Resistance is highly affected by temperature. When an electric current flows through a silicon carbon rod, it heats up, and resistivity is obviously related to the current. We can see that it is actually the current that affects the resistance, not the resistance, and the volt-ampere characteristic curve of the current arc has obvious negative resistance characteristics.

In addition, the arc resistance is related to temperature, and temperature has a certain hysteresis characteristic, so when the arc current changes rapidly, the arc equivalent resistance does not change immediately, in fact, the arc equivalent resistance hinders the current change. This property is known as the current-limiting characteristic of the arc. It can be seen that arc is not necessarily a bad thing, it still has certain benefits for limiting short-circuit current.

Now, it's time to conclude this post with the question "How does resistance actually affect current?" I think it should be the other way around, saying, "How does current affect resistance?" , so that's right. From the above three examples, we can see that resistance or impedance is the manifestation of a certain component. In the words of circuit analysis:

The resistor or impedance is the ID card of the component. Whether it's a resistor, a transistor, a diode, an arc, or even the characteristic curve of an electromagnetic system, we can see the positive, zero, and negative resistance characteristics on the volt-ampere characteristic curve, and even see the curve show steps. These need to be analyzed in combination with the actual situation, and cannot be generalized.

Therefore, the knowledge behind the topic is actually the impedance characteristic analysis of the components on the volt-ampere characteristic curve, and the deep principles of the components need to be done before the conclusion can be drawn. Different components have different impedance characteristics. This is a very meaningful thing.

Original: On this question, we must first understand what current is, current is not electron flow, electron flow is thermal effect or heat flow. The energy movement of electrons is divided into two parts of energy movement, in which the energy flow into the electrons is the action of the electric field, which is the "force" that promotes the coupling between electrons, and the essence of this "force" is the interaction of energy, not the role of "force", which is originally a false proposition.

The flow of energy out of the electron is divided into two parts, one of which will flow from the new inlet of the electron, and this part of the energy flow is the current, which happens to coincide with the direction of movement of the electron. The reason why everyone does not feel its existence is that the invisible energy movement is untraceable, and physics is not something you see or exist, let alone a mathematical need to exist, because physical variables are different from mathematical variables, and physical variables are often qualitative variables, that is, physical variables are not only numerical changes, but their changes often produce qualitative changes - and eventually become unrecognizable.

Electric current is the energy flow formed by the coupling of electrons under the action of an electric field, and the energy flow has an energy gradient or an energy level gradient, that is, an electric potential gradient. The current flowing through the appliance is equivalent to intercepting the energy flow on the main circuit, so that the energy gradient of the current flowing out of the appliance decreases, resulting in a decrease in the electric potential at the outlet end of the appliance, which is the so-called resistance. Another reason for resistance is the number of free electrons in the component, the smaller the number of free electrons, the lower the degree of coupling of the electrons, resulting in the energy flow - the smaller the current, which is the resistance in the second sense.

I bought some of the above, and it would be better to understand it if you use the electronic magnetic distance theory.

When the voltage at both ends of the conductor is constant, the current flowing through the conductor is inversely proportional to the conductor resistance.

The formula for the relationship between current, voltage and resistance is: i=u r, where i is the current, u is the voltage, and r is the resistance. From the above formula, it can be seen that when the voltage is constant, the larger the current, the smaller the resistance, and vice versa, the smaller the current, the greater the resistance.

Scientifically, the amount of electricity passing through any cross-section of a conductor per unit of time is called current intensity, referred to as current. It is usually denoted by the letter i, and its unit is amperes. The SI unit of electric current, the ampere, is named after its surname), abbreviated as "ampere", and the symbol "a", also refers to the directional movement of electric charges in a conductor.

The free charge in the conductor moves regularly and directionally under the action of the electric field force to form an electric current. The white in the conductor is formed by the regular directional motion of the electric charge under the action of the electric field force.

The electromotive force of the power supply forms a voltage, and then generates an electric field force, under the action of the electric field force, it is in the electric microampere (a) 1a = 1000mA = 1000000 a, and the electricity stipulates that the direction of the directional flow of positive charge is the direction of the current. The microscopic expression of the current in a metal conductor is i=nesv, n is the number of free electrons per unit volume, e is the amount of charge of the electrons, s is the cross-sectional area of the conductor, and y is the charge velocity.

There are many kinds of charge-carrying carriers, for example, electrons that can move in a conductor, ions in an electrolyte, electrons and ions in a plasma, and quarks in hadrons. The movement of these carriers forms an electric current.

The greater the resistance, the smaller the current passing through the resistor. The smaller the resistor ballast, the greater the current through the resistor.

Because the resistor is a conductor, the conductor can pass an electric current. The current flows in from one side of the resistor and flows out violently there, and the current flowing in is equal to the current flowing out of the bridge.

The relationship between the current and the voltage resistance of a pure resistive element is, the voltage resistance and current.

Current = Voltage Resistance.

Ohm's law is simply described as follows: In the same circuit, the current through a conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor. This law was proposed by the German physicist Georg Simon Ohm in his book "Determination of the Law of Conductivity of Metals" published in April 1826.

To generate current in a circuit, it is not enough to have voltage, but also to have a circuit, so this can solve your doubts. Since there is a circuit, there will be resistance, if the circuit is disconnected, it is equivalent to the infinite resistance of the circuit, at this time there is no current, and the above formula is consistent.

The outermost electrons of a metal atom are very unstable and can easily lose electrons (negatively charged) and act as free electrons, and the amount of electricity of one electron is coulomb. These free electrons come together and act in an electric field, and the voltage = the difference in the electric field between the two points. Resistance = resistance of a material to an electron, related to the material, cross-sectional area, length.

AC (the amount of electricity that flows through a coulomb in one second is called a amp).

1. Connect the food according to the circuit diagram (the circuit diagram is equivalent to the circuit diagram of the volt-ampere resistor).Note that the resistor that is connected first is assumed to be 5 ohms, and the sliding blade slides to the maximum resistance before closing the switch.

2. Close the switch, slide the slide to make the indication of the voltmeter at a fixed value (assuming 6V), and write down the indication of the ammeter at this time.

3. Replace the resistance of 10 ohms with a resistance of 5 ohms, and repeat the above experimental process. The sliding blade makes the voltmeter stop sliding when the indication of 6V is unchanged. Make a note of the indication of the ammeter at this time.

4. Replace the 10 ohm resistance with a 15 ohm resistor, and repeat the above experiment. Ice keeps the indication of the voltmeter unchanged at 6V, and write down the indication of the ammeter at this time.

5. The comparison finds that when the voltage is constant, the resistance increases exponentially, while the current through the resistor decreases exponentially.

6. Conclusion: When the voltage is constant, the current is inversely proportional to the resistance.

Experiment 17 ** Relationship between current and voltage and resistance.

The relationship between resistance and current is like this. When the resistance of the resistor is fixed, the voltage drop across the resistor is variable when a variable current is passed. When the current value is fixed, the constant change of the resistance value will also cause the voltage drop at the two ends of the resistor to be different.

This is commonly used in electronic circuits.

Hello:——1. Voltage, resistance, current;

power, voltage, current;

power resistance) re-square the current;

2. The square resistance of the current and the power;

the square of the voltage resistance and power;

Voltage, current, power;

3. The square resistance of the power current;

the square of the voltage power resistance;

voltage, current, resistance;

4. (power resistance) re-open the square voltage;

power, current, voltage;

Current, Resistance, Voltage;

5. Please see the formula shown in the attached figure: