What is capacitance resistance and what is the resistance of a capacitor

For DC circuits, the resistance value of the capacitor is infinite. For AC circuits, the resistance value of the capacitance is related to the frequency of the AC and the capacitance of the capacitance, which is called capacitive reactance. There is a formula for calculating it.

The resistance value of the capacitor varies greatly, it is related to the quality of the capacitor, the medium used, the precision, and the withstand voltage, generally the resistance value of the 25 volt 1 micromethod electrolytic capacitor is about 500 thousand ohms, and the resistance value of the same 25 volt 1 micromethod mica capacitor is generally infinite.

There is no specific number of resistance values of capacitors, and the resistance values vary depending on the material of the capacitor.

The resistance value of a capacitor is infinity.

<> one. The role of capacitors is as follows:

1. Filtering: filter out the width of the AC component that is not needed in the DC power supply, so that the DC power is smooth;

2. Decoupling: prevent the parasitic oscillation caused by the positive feedback formed by the internal resistance of the power supply;

3. Bypass: avoid the voltage drop attenuation of AC signal components due to resistance;

4. Coupling: DC can be isolated, so that AC signals or pulse signals can pass through, so that the DC working points of the front and rear amplification circuits do not affect each other.

Two. The role of the resistor is as follows:

1. Current limiting: In order to ensure that the current passing through the electrical appliances does not exceed the rated value or the specified value required for actual work, so as to ensure the normal operation of the electrical appliances;

2. Shunt: connect the two ends of the electrical appliances with small rated current into a resistor in parallel, so that the trunk circuit of the circuit can be connected to several electrical appliances with different rated currents at the same time;

3. Voltage division: connect the electrical appliance in series with a resistor with a suitable resistance value, and share part of the voltage to make the electrical appliance work under the rated voltage.

<> one. The role of capacitance is as follows:

1. Filtering: Filtering out direct current.

unwanted AC components in the source to smooth the DC power;

2. Decoupling: prevent parasitic oscillation caused by positive feedback formed by the internal resistance of the power supply;

3. Bypass: avoid the voltage drop attenuation of AC signal components due to resistance;

4. Coupling. The DC can be cut off, so that the AC signal or pulse signal can pass through, so that the DC working points of the front and rear stage Xiaofeng amplification circuit do not affect each other.

Two. The role of the resistor is as follows:

1. Current limiting: In order to ensure that the current passing through the electrical appliances does not exceed the rated value or the specified value required for actual work, so as to ensure the normal operation of the electrical appliances;

2. Shunt: the rated current.

The two ends of the smaller electrical appliances are connected in parallel with a resistor, so that the trunk circuit of the circuit is connected to several electrical appliances with different rated currents at the same time;

3. Voltage division: connect the electrical appliance in series with a resistor of an appropriate resistance value, and share part of the voltage to make the electrical appliance at the rated voltage.

under work.

1. The meaning is different.

Capacitor: It is a component that stores electricity and electrical energy.

Resistance: Indicates the magnitude of the conductor's resistance to the current and is a physical quantity.

2. The units are different.

Capacitance: The basic unit of capacitance of a capacitor is the farad (f).

Resistance: The unit of resistance is ohm, referred to as ohm, and the symbol is .

3. The expressions are different.

Capacitance: In circuit diagrams, the letter C is usually used to denote capacitive components.

Resistance: Resistance is a physical quantity that describes the conductivity of a conductor and is denoted by R.

Capacitor A device consisting of electrodes made of two conductors that are close to each other and insulated from each other to store electrical charge and energy. So its thermal resistance (for direct current) is close to infinity and for alternating current is (0). Decoupling, filtering, energy storage.

It is the energy storage element that generates reactive power. General auxiliary circuits obtain stable power supply and reduce interference!

Resistor A two-terminal electronic component made of resistive material, with a certain structural form, which can play a role in restricting the passage of current in a circuit. If the resistance value cannot be changed, it is called a fixed resistor. Those with variable resistance are called potentiometers or variable resistors.

The ideal resistor is linear, i.e., an electrical appliance that restricts the current in a circuit or converts electrical energy into heat, etc., in proportion to the applied instantaneous voltage. Its impedance is resistance is that the thermal-effected device generates active power and converts electrical energy into thermal energy. It's the same for both AC and DC.

It is the main load and connector (wire) in the circuit

Resistance can be used as an electrothermal element, converting electrical energy into internal energy, which is generated by the resistance of atoms to electrons.

A capacitor is two plates that are not connected and are used to store the electrical charge and release the electric charge, which converts the electrical energy into electric field energy. As long as the appearance of capacitance and resistance is not damaged, the parameters can be measured directly with a permanent multimeter: capacitance resistance.

The capacitance is AC and DC, the higher the frequency, the smaller the capacitive reactance, and it does not consume energy; The resistance is both AC and DC, the resistance is constant regardless of frequency, and the resistance consumes energy.

Resistance and capacitance are complementary to each other.

Resistors and capacitors play a role in electrical appliances through complex combinations, and the reliability of these two components complements each other to form complex circuits.

Resistance: The part of the circuit that hinders the passage of current and causes energy consumption is called resistance.

One of the conductors stores a positive charge and the other one stores a negative charge of equal magnitude. The greater the added voltage, the more power is stored. The amount of electricity stored is directly proportional to the voltage added, and their ratio is called capacitance.

Electrical safety knowledge:

1. Refuse to overload electricity.

It is best not to start high-power electrical appliances such as air conditioners, TVs, and microwave ovens at the same time, otherwise the instantaneous current will be too large and it will be easy to cause disasters. During peak hours, high-capacity equipment must use dedicated routes. The wiring of the mobile socket should not be too thin, and the amount of equipment on the socket should not be too much.

2. Select qualified electrical appliances.

Do not use fake and shoddy electrical appliances, wires, trunking (tubes), switches, sockets, etc. <>

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 often play the role of voltage and voltage distribution shunts in the circuit, and for signals, both AC and DC signals can pass through the resistor.

Resistors all have a certain resistance value, which represents the amount of resistance to the current flow. The unit of resistance is ohms, which is denoted by the symbol " ". Ohm is defined like this:

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 the positive ohm, the units of resistance also have the nucleus kiloohm (k), megaohm (m) and so on.

Capacitance is a physical quantity that characterizes a capacitor's ability to hold an electric charge. The capacitance of a capacitor is called the capacitance of a capacitor by increasing the potential difference between the two plates of a capacitor by 1 volt.

The symbol for capacitance is cIn the International System of Units, the unit of capacitance is farad, abbreviated as law, and the symbol is fFor a capacitor, if the potential difference between the two stages is 1 volt when there is a charge with 1 bank, the capacitance of this capacitor is 1 method.

1. The meaning is different.

Capacitor: It is a component that stores electricity and electrical energy.

Resistance: Indicates the magnitude of the conductor's resistance to the current and is a physical quantity.

2. The units are different.

Capacitance: The basic unit of capacitance of a capacitor is the farad (f).

Resistance: The unit of resistance is ohm, referred to as ohm, and the symbol is .

3. The expressions are different.

Capacitance: In circuit diagrams, the letter C is usually used to denote capacitive components.

Resistance: Resistance is a physical quantity that describes the conductivity of a conductor and is denoted by R.

The relationship between capacitance and resistance is as follows:

Resistive and capacitive components play a role in electrical appliances through complex combinations, and the characteristics of these two components complement each other to form complex circuits. Among them, the resistance of the inductor is related to the frequency, so it is commonly used in frequency-related circuits, and the organic combination can strengthen or weaken the current of a specific frequency.

To give a real-life example, we often see that after the plug is unplugged, the diode on it will continue to light up for a while.

In fact, this is because the capacitors inside store the electrical energy in advance and then release it. Of course, this capacitor was originally used as a filter. As for the so-called capacitive filtering, I don't know if you have the experience of listening to the Walkman with a rectifier power supply, and the inferior power supply is due to the manufacturer's cost savings.

Considering the use of a very small capacitance filter capacitor, there will be a buzzing sound in the headphones. At this time, a large capacity electrolytic capacitor (1500 F, note that the positive pole is connected to the positive pole) can be attached to both ends of the power supply, which can generally improve the hearing effect.

Audiophiles make HIFI high-end audio, not to mention will use at least 10,000 microfars of more than 10,000 capacitors to filter, the larger the filter capacitor, the closer the output voltage waveform is to DC, and the energy storage effect of the capacitor makes the sudden large signal arrive, the circuit has enough energy to convert into a powerful audio output.

Resistance is defined as follows:

Resistance is a physical quantity that describes the electrical conductivity of a conductor and is denoted by R. Resistance is defined by the ratio of the voltage u at both ends of the conductor to the current i passing through the conductive body, i.e., r=u i. Therefore, when the voltage at both ends of the conductor is constant, the greater the resistance, the smaller the current passing through.

Conversely, the smaller the resistance, the greater the current that will pass through.

A capacitor is an electronic component that holds and dissipates electrical charge. The basic working principle of capacitors is charge and discharge, and of course rectification, oscillation and other functions.

In addition, the structure of the capacitor is very simple, mainly composed of two positive and negative electrodes and an insulating medium sandwiched in the middle, so the capacitor type main empty limb should be determined by the electrode and the insulating medium. <>

A capacitor is a container capable of holding electricity, like a cup of water. Therefore, the capacitor is capable of charging and discharging, and the magnitude of the charge-discharge action determines the capacity of the capacitor.

There are many types of capacitors, the most common are electrolytic capacitors, large capacity, positive and negative electrodes, ceramic capacitors, small capacity, no positive and negative electrodes, poor temperature characteristics, polyester electric capacitance, polyester film capacitors, small capacity, good temperature characteristics, etc.

The main parameter of ceramic capacitors is the capacitance, and the high-voltage resistant ceramic capacitors for special purposes will be known as the lead to mark the withstand voltage. The use of ceramic capacitors does not need to be divided into positive and negative poles, and the two ends can be used arbitrarily. Resistance is an obstacle to the current current.