Is the resistance certain? Is the resistance value of a resistor inherent in itself?

The home circuit is a parallel circuit, and the voltages in the parallel circuit are equal everywhere, and the sum of the currents of each branch is equal to the current of the dry circuit. The more electrical appliances are turned on, the greater the total power, the greater the current of the trunk circuit, and the voltage is the same, so the resistance of the trunk circuit becomes smaller. The current of the parallel circuit is determined by the number of electrical appliances connected in parallel, that is, the amount of power.

Not a definite number.

The resistance of a conductor refers to the total resistance.

If you use more electrical appliances and use electrical appliances in parallel, the total resistance will be smaller.

The current of the parallel circuit changes with the resistance (the voltage of the parallel circuit does not change), and the current increases with the decrease of resistance.

From Ohm's law i=u r, when the resistance r is constant, when the voltage u increases, the current i also increases, and there is a proportional relationship at this time.

The resistance is constant, the voltage is increased, and the current is not changed, which is generally not easy for a single electrical appliance. Unless other equipment or components are added, such as shunt circuits or shunt resistors.

In parallel circuits, the electromotive force e is constant.

According to Ohm's law, the internal circuit is i=e (r+r), so the current changes with the sum of the total resistance of the inner circuit and the outer circuit.

About resistors. It is constantly changing with temperature: the higher the temperature, the lower the resistance. Otherwise, the bigger it is.

Hello, the resistance value of the resistor exists by itself, and the resistance of the conductor to the current is called the resistance of the conductor. Resistance (usually denoted by "r") is a physical quantity that represents the magnitude of a conductor's impediment to the dispersion of an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current.

Different conductors, the resistance is generally different, and the high resistance of electric digging is a property of the conductor itself. The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, referred to as ohm, and the symbol is .

In physics, resistance is used to express the magnitude of a conductor's resistance to an electric current. The greater the resistance of a conductor, the greater the resistance of the conductor to the current. Different conductors, the resistance is generally different, and resistance is a property of the conductor itself.

A resistive element is an energy-dissipating element that hinders the current current.

Because there are a large number of free electrons in metals, metals are easy to conduct electricity, but the other parts of metal atoms except for the outermost electrons (also called atomic solids) cannot move freely, and their orderly arrangement seems to form the "skeleton" of metals. When free electrons move in a directional way under the action of voltage, they are actually moving in a metal "skeleton" and will inevitably collide with the atoms that make up the skeleton, so the conductor must have an obstructive effect on the directional movement of the current-free charge. In conclusion, the tendency of a conductor to conduct electricity is due to the large amount of free charge in the conductor, and the resistance of the conductor is due to the fact that there is a larger number of parts in the conductor that cannot move freely.

Electrical work is actually the sum of the energy expended by all electrons to overcome resistance.

Adding a voltage at both ends of the conductor actually exerts an electric field at both ends of the conductor, and the electrons in the conductor can move relatively freely, and will move in the direction of high electric potential under the action of the electric field force, and the directional movement of the electrons will form a macroscopic current.

However, in fact, the movement of electrons is not completely free, and they are also attracted to a certain extent by the metal cations in the metal crystal, resulting in a certain limit on the number of electrons flowing through a unit of time, which is manifested as the movement of electrons being blocked. For bad conductors, the degree of freedom of the electrons is weaker (stronger bound by the nucleus), and only a few electrons with high energy are able to participate in directional movement, which is characterized by high resistance and low current.

In addition, the motion of free electrons in a conductor (assuming that long straight wires are considered) is not a linear motion, on the one hand, free electrons have a tendency to move in a directional linear motion under the action of electric field forces, and on the other hand, the electrons themselves are subjected to the electrostatic repulsion of the surrounding electrons (or simply understood as random collisions) and have thermal motion during migration, so that the path of the electrons is actually tortuous, which is also manifested as a decrease in the current. When the temperature of the conductor increases, the thermal motion of the electrons intensifies, and the directional flow becomes more difficult, which is manifested by an increased hindrance effect, i.e., a greater resistance.

Resistors are electronic components that are used to restrict the flow of current.

Its composition contains a small amount of charged particles.

It can both turn on and limit the current, and when a relatively large current passes through, it will consume a part of the current (in the form of heat) to reduce the current.

Therefore, resistors also have a great application in protection circuits.

In a certain period of time, under the electric field generated by the voltage, a certain amount of electrons will flow through the object;

In terms of quantitative value, the resistance is the voltage value required to pass 1 coulomb charge through the object per unit time;

The lower this value, the better the conductivity.

The amount of charge is a specific parameter of electrons. A single electron has a specific amount of charge.

The number of electrons can also be stated by the amount of charge.

This hindrance of resistance is manifested as an obstacle to the movement of the electron in a specific direction by the nucleus in a specific structure of an object and the potential field it generates, such as lattice scattering

As the name suggests, it is the obstructive effect of an object on an electric current.

It is a physical quantity that measures the ability of an object to conduct electricity.

It's a concept that is the inherent physical properties of an object itself.

What is the concept of resistance.

Resistance. Definition: The resistance of a conductor to an electric current is called the resistance of a conductor.

Resistors are the most used components of all electronic circuits. The main physical characteristic of the resistor is that it transforms electrical energy into thermal energy, which can also be said to be an energy-dissipating element, and the internal energy is generated when the current passes through it. Resistors usually play the role of voltage divider shunt in circuits, and for signals, both AC and DC signals can pass through resistors.

Resistors all have a certain resistance value, which represents the amount of resistance resistance to the flow of current. The unit of resistance is ohms, which is denoted by the symbol " ". Ohm defines splitting the year as follows:

When a voltage of 1 volt is applied to both ends of a resistor, if 1 ampere of current passes through the resistor, the resistor has a resistance of 1 ohm. In addition to ohms, the units of resistance include kiloohms (k), megaohms (m), etc.

The electrical performance indicators of resistors usually include nominal resistance, error and rated power.

Together with other components, it forms some functional circuits, such as RC circuits.

A resistor is a linear element. It is said to be a linear element because it has been experimentally found that, under certain conditions, the current flowing through a resistor is proportional to the voltage across the resistor – that is, it conforms to Ohm's law: i = u r

Common carbon or metal film resistors can be simulated with linear resistors when the temperature is constant and the voltage and current values are limited to the specified conditions. If the voltage or current exceeds the specified value, the resistor will overheat and will not obey Ohm's law and may even burn out. The relationship between the operating voltage and the current is shown in Figure 1.

There are many types of resistors, which are usually divided into carbon film resistors, metal resistors, wirewound resistors, etc.: it also includes fixed resistors and variable resistors, photoresistors, varistors, thermistors, etc. But no matter what kind of resistor it is, it has a basic representation of the letter "r".

The unit of resistance is expressed in ohms ( ). What does it include? (ohms), k (thousand ohms), m (megaohms). The conversion relationship is:

1mω=1000kω

1kω=1000ω。

The resistance value standard method of resistor usually has the color ring method and the number method. The color ring method is more common in general resistors. Since the resistance in the mobile phone circuit is generally relatively small, it is rarely marked with a resistance value, and even if there is, the digital method is generally used, namely:

101 - represents the resistance of 100;

102 – represents the resistance of 1k;

103 – represents a resistance of 10k;

104 – represents a resistance of 100k;

105 - represents the resistance of 1m;

106 – indicates a resistance of 10m.

Resistance, denoted by the symbol r. At its most basic, it is to block the flow of electric current. The two most basic parameters to measure a resistor are resistance and power.

The resistance value is used to indicate the magnitude of the resistor's resistance to the current resistance, and is expressed in ohms. In addition to the basic units, there are kiloohms and megaohms. Power is used to express the maximum current that the resistor can bear, expressed in watts, there are 1 16W, 1 8W, 1 4W, 1 2W, 1W, 2W, etc., beyond this maximum, the resistor will burn out.

According to the different materials of resistors, there are cement resistors (low production cost, high power, high thermal noise, inaccurate resistance value, unstable work), carbon film resistors, metal film resistors (small size, stable work, low noise, high precision) and metal oxide film resistors and so on. According to whether its resistance value is variable or not, it can be divided into fine-tuned electric bridge resistance, adjustable resistance (potentiometer) and so on.

Resistance is the resistance to electricity, and it is something that can carry electricity. Such as light bulbs, electrical appliances, etc.

Answer: Hello, in simple terms, resistance refers to the resistance encountered by the current in the circuit, or the ability of the object to hinder the current. The greater the resistance, the greater the resistance to the current and therefore the lower the current. Conversely, the smaller the resistance, the less resistance the current will be, and therefore the greater the current.

Hello, in simple terms, resistance refers to the resistance encountered by the current in the circuit, or the resistance of the object to the current. The greater the resistance, the greater the resistance to the current and therefore the lower the current. Conversely, the smaller the resistance, the less resistance the current will be, and therefore the greater the current.

The symbol of the resistor is "r". The unit of resistance is ohms, referred to as ohms, and is represented by the letter "q".

Resistance is present in any object, and conductors are no exception. For example, when a rice cooker is cooking, the wire will heat up a little, and the reason for this is that the copper used to make the wire has a small resistance, but it still consumes local electrical energy and distributes it in the form of heat under the condition of high current for cooking.

What is the concept of inflated omen of electric difference rent resistance.