Whether the resistance varies greatly with temperature or the resistance is small with the change

The resistance of a conductor is temperature dependent. The resistance of pure metal increases with the increase of temperature, and the resistance value of 1 increase by a few thousandths as the temperature increases. The resistance of carbon and insulator decreases with increasing temperature.

The resistance value of the semiconductor has a great relationship with the temperature, and the resistance value decreases greatly with a slight increase in temperature. The resistance of some alloys has little to do with temperature changes. So it's hard to say.

First of all, we need to be clear about the concept of resistors. Resistance can be understood as a hindrance to the current, just as water passes through a water pipe, and the water pipe has a hindrance effect on the water. Depending on the material, this hindrance is different, i.e., the resistance is different.

A more common way to say it is that the size of the resistance is related to the temperature. Whether the temperature increases, the resistance becomes larger or smaller, it depends on the material. At the junior high school level, it is generally assumed that the lower the temperature, the lower the resistance (this is true for most materials, especially metals).

So there is the saying of superconductors, that is, when the temperature drops below a certain value, the resistance of the object becomes very small and negligible.

As the temperature increases, the resistance of the metal conductor increases; As the temperature decreases, the resistance of the metal conductor decreases. If a material is reduced to a certain level, the resistance suddenly disappears, and it becomes a superconducting phenomenon.

Resistance materials have positive temperature coefficient and negative temperature coefficient, and the resistance of the positive temperature coefficient varies greatly with temperature, and vice versa.

It depends on the material used in the resistor.

Why does the higher the temperature, the greater the resistance?

When the substance in question is metal, the higher the temperature satisfies the greater the resistance. Reason: First of all, the reason why metals can conduct electricity is because there are freely moving electrons (irregular) inside them.

The atoms in the metal except for the free electrons also vibrate near their positions, and the intensity of this vibration is related to the temperature of the metal, the higher the temperature, the more intense the vibration. At the same time, the greater the chance of collision between the free electron and the atomic solid, the more it hinders the directional motion of the electron, that is, the resistance increases.

When the substance is metal, the higher the temperature, the greater the resistance.

When the substance is a non-metallic substance (some semiconductors), the higher the temperature, the smaller the resistance. Reason: When the temperature rises, the movement of electrons inside it intensifies (but does not vibrate back and forth), which in turn can carry an electric charge.

The higher the temperature of some semiconductors, the greater the resistance.

However, not all resistances increase with temperature:

1. When the temperature increases, the resistance may not necessarily be larger, it may increase, it may decrease, or it may remain basically the same. This is related to the resistive material, which is the nature of the resistance itself.

2. Among them, the temperature sensitive resistor is called thermistor, and thermistors are divided into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of the positive temperature coefficient thermistor increases with the increase of temperature, and the resistance value of the negative temperature coefficient thermistor decreases with the increase of temperature.

3. The resistance value of pure metal increases with the increase of temperature, the resistance of carbon and insulator decreases with the increase of temperature, and the resistance of some alloys such as constantan and manganese copper has little relationship with temperature change.

Through the above content, we can see that not all resistance will increase with the increase of temperature, mainly to consider the actual situation, different conditions, different resistance materials, the changes are different, which is mainly determined by the physical characteristics of the conductor.

In general, the temperature is high, and the resistance value is large.

The most famous is the PT100 platinum resistance, the resistance value is 100 at 0, and the resistance value at 100 is that with the change of temperature, the resistance value also changes, and the temperature is determined by this principle.

Of course, the original incandescent lamp in life has a small resistance value when it is first turned on (tested with a multimeter), and the resistance value will increase when it works for a period of time.

The resistivity of most materials increases with increasing temperature. This is a material with a positive temperature coefficient. That's why we have resistive materials available. For example, in the case of a light bulb, the temperature rises, the resistance rises, and when the voltage does not change, the current decreases and the temperature tends to stabilize.

The resistivity of a few materials, especially semiconducting materials, decreases as temperature rises. This is a negative temperature coefficient material.

This problem is not absolute, but for the vast majority of materials, the higher the temperature, the greater the resistance, the lower the temperature, and the smaller the resistance. In the latest superconductor technology developed now, it can only be achieved in liquid nitrogen, that is, it can only be achieved at minus one or two, and some materials of superconductors require lower temperatures. If it could be found that a material can be a superconductor at room temperature, or in an environment of minus twenty or thirty degrees, it will definitely be a great invention.

can change the whole human world. It will be a complete industrial revolution. If superconductors can be widely used, it will be unimaginable for the entire human society to be subversive.

Of course, the higher the temperature, the greater the resistance. If it seems that cold shrinkage fat electrons must run slower than thin electrons. Whereas, superconductors are mostly formed at ultra-low temperatures.

In general, under the same voltage, the higher the temperature of the metal conductor, the greater the resistance, while the opposite is true for non-metal conductors, the higher the temperature and the lower the resistance.

The higher the temperature is also the greater the resistance, and it can be thought of the other way around, the phenomenon of superconductivity occurs at low temperatures, and the electrons in the object at high temperatures help less to conduct electricity.

This one is generally reduced, but some materials are reversed.

The resistance of a conductor is represented by an uppercase r, which is related to three internal factors: length, cross-sectional area, and type of material, as well as an external factor: the temperature of the conductor, and for most conductors, such as metals, the resistance of the conductor increases with the increase in temperature.

For a small number of conductors, such as non-metals, the resistance decreases as the temperature of the conductor increases.

While the resistance of most (metallic) semiconductors increases with increasing temperature, some semiconductors do the opposite.

Reason: First, metals can conduct electricity due to the free movement (irregularity) of electrons. Except for free electrons.

Outside, the atoms in the metal vibrate near their position. The intensity of the vibration is related to the temperature of the metal.

The higher the temperature, the stronger the vibration. At the same time, the greater the probability of collision between free electrons and atoms, the more it hinders the directional motion of electrons, i.e., the increase in electrical resistance. When the material is metal, the higher the temperature, the greater the resistance.

The factors that affect the resistance are:

1. Length: Generally speaking, the longer the length of the conductor, the greater the resistance, and if it is a short-distance transmission, the resistance is very small.

2. Cross-sectional area: If the conductor of the same material has the same length, the resistance of the one with a small cross-sectional area will be greater.

3. Material: Two conductors with different materials, even if the length and cross-sectional area are the same, the resistance will still be different, especially the resistance between metals and non-metals is far apart, and now there is a superconductor.

material, its resistance is almost zero.

4. Temperature: Temperature is the key to the resistance value of the conductor, as mentioned above, the influence of temperature on the resistance. The higher the temperature of most conductors, the greater their resistance, and the higher the temperature of non-metallic conductors such as carbon, the lower the resistance.

Dr. Ping's code: The higher the temperature, the greater the resistance, and the resistance will disappear when it is minus 270 degrees!

Temperature is never an important factor in determining the size of the resistance, the material factor is

In pure resistance in metals, when the temperature rises, the vibration of the atoms also increases, and then the probability of electrons hitting the atoms also increases, so generally the temperature increases, and the resistance increases. However, the non-metallic ones are different.

No! It depends! The higher the temperature of ordinary metal resistors such as tungsten, iron, copper, etc., the greater the resistance, and the resistance value of some alloy resistors does not change with temperature, and the resistance value is certain. The higher the temperature of the thermistor, the smaller the resistance!

No, it depends.

For metal materials, the higher the temperature, the greater the resistance, such as a working bulb, the longer it works, the greater the resistance.

Non-metallic materials may decrease with increasing temperature, such as two wires next to a glass sphere, the glass resistance reaches 10 to the 16th power of 16 ohms, but when the outside temperature reaches more than 300 degrees Celsius, an absolute path is formed.

In addition, the resistance of a fixed-value resistor is not affected by temperature.

The first one: different resistors apply the same voltage, the smaller the resistance, the greater the current through it, the greater the power consumed, and the greater the natural heating.

The second cherry blossom burns: the same resistance, as long as it is not a resistance with a negative temperature coefficient, then, the higher the temperature, the more spine and false the resistance. This is determined by the physical properties of the finch conductor.

So, these two questions are not contradictory.

Summary. In general, an increase in temperature leads to an increase in resistance. This is because an increase in temperature increases the frequency of collisions between electrons and atoms in a conductor, which increases the electrical resistance. This phenomenon can be explained by the thermally induced resistance effect and the temperature coefficient of the material.

In general, the temperature increases and the resistance increases. This is because the increase in temperature increases the frequency of collisions between electrons and atoms in the conductor, which increases the electrical resistance. This phenomenon can be explained by the thermally induced resistance effect and the temperature coefficient of the material.

According to the thermally induced resistance effect, when the temperature increases, the atoms and depletions in the conductor vibrate at a higher velocity. This causes electrons to collide more with atoms and molecules as they move through the conductor defeat, blocking the flow of electric current, resulting in an increase in electrical resistance. In addition, different materials have different temperature coefficients, i.e., the sensitivity of temperature to changes in resistance.

Some materials exhibit a positive temperature coefficient, i.e., the resistance increases as the temperature increases, such as most metals. Other materials, such as thermistor materials, exhibit a negative temperature coefficient, i.e., the resistance decreases as the temperature increases.

Some special materials or devices may exhibit the opposite of the above laws, such as certain semiconductor molds or special thermistors. Therefore, in specific cases, the temperature on the resistance of the draft hail may vary.