Will the capacitors in the circuit be charged when the DC circuit is energized?

No. The so-called "energizing" of capacitors is different from conducting electricity in the ordinary sense. Capacitors are not conductors.

There is an insulator between the poles. It cannot be passed by direct current. The capacitor can be through the alternating current is the alternating electric field to the plate repeated charge, discharge, the multimeter ohm file will see the change of the meter value when measuring the capacitor, this is not a current through, but the multimeter is connected to the capacitor at the moment of the multimeter battery charge and discharge caused by the meter value change.

A direct current circuit (DC circuit) is a circuit in which the direction of the current does not change, and the current magnitude of the DC circuit can be changed. If the magnitude and direction of the current are constant, it is called a constant current. DC current will only flow when the circuit is closed and stop flowing completely when the circuit is disconnected.

Outside the power supply, the positive charge flows from the high potential to the low potential through resistance, and in the power supply, the electrostatic force is overcome by the action of the non-electrostatic force of the power supply, and then the positive charge is removed from the low potential"Porteering"When it reaches a high potential, it cycles and so on, forming a closed current line. Therefore, in a DC circuit, the role of the power supply is to provide a constant electromotive force that does not change with time, supplementing the Joule heating consumed on the resistor. For example, the flashlight we use (with dry batteries), it constitutes a DC circuit, generally speaking, the dry battery, the battery as the power supply circuit can be regarded as a DC circuit, you have to put the mains through the rectifier bridge, after the voltage transformation, as a power supply and the composition of the circuit, is also a DC circuit, the general low-voltage electrical appliances are the use of direct current, especially battery-powered appliances.

Most circuits require DC power. But the electricity used in our televisions, lamps and other household appliances is alternating current, and they are AC circuits.

The capacitors in the circuit will be charged when the DC circuit is energized, and if the external voltage does not drop after charging, there will always be power.

There is a large current when charging, and the current is zero when fully charged.

Of course, yes, the capacitors are not charged before the circuit is turned on, and the circuit will be in a state of charge balance regardless of the size when the circuit is working normally, regardless of the filter capacitor or the coupling capacitor, there is a charging process, you can use the ammeter (better with an oscilloscope) to detect the start-up current, which must be larger than the normal operation, which is the reason.

Since the capacitor is not charged, when direct current is turned on, the capacitor is charged, and an electric current passes through the circuit. When the capacitor is fully charged, the voltage of the capacitor reaches stability, if the voltage added to the capacitor in the circuit is inconvenient, then the capacitor is neither charged nor discharged, and there is no current in the current.

It depends on where the capacitance is! If it's a filter capacitor in a power supply, that's what it looks like! None of the others!

Charging: At the beginning of the uproar, the voltage at both ends of the capacitor is 0, and the power supply voltage is relatively high, which is equivalent to the capacitor Zhixian is short-circuited, so the current is very large at the beginning of the moment. Theoretically, at the beginning of charging, the charging current is infinite, but because of the line impedance, it can only be very large rather than infinite.

As the charge on the capacitor increases, the voltage at both ends of the capacitor also slowly increases, and the voltage between the power supply and the capacitor decreases. Filled. Discharge, is the reverse process of charging.

The capacitor is equivalent to a "short circuit" at the moment of energization, and the current is relatively large, which will cause the components in the circuit to be subjected to instantaneous voltage and current impact; Therefore, the quality of the capacitor should be good; If the capacitor is charged or discharged very quickly, it can cause high-frequency response and resonance phenomena in the circuit, which can adversely affect the stability and performance of the circuit. Therefore, when designing the circuit, it is necessary to consider the speed of capacitor charging and discharging and the working frequency of the circuit to ensure the stability and reliability of the circuit.

At the moment of charging and discharging of the electric volt, the circuit will have a current transient phenomenon, that is, an instantaneous change in current. At the moment of charging, the current starts from zero and gradually increases until it reaches a steady state; At the moment of discharge, the current starts at the maximum and gradually decreases until it reaches a steady state. At the same time, the voltage across the capacitor changes during charging and discharging.

At the moment of charging, the voltage at both ends of the capacitor starts from zero, and the gear size gradually increases until it reaches a steady state equal to the power supply voltage; At the moment of discharge, the voltage across the capacitor starts at the maximum and gradually decreases until it reaches a steady state of zero.

1. The two poles of the capacitor are like a container, which can store the charge.

2. It is similar to water and buckets, water is equivalent to electricity, when the electric potential is unbalanced, that is, the water level is unbalanced, it needs to fill the bucket, it generates an electric current, and when it is filled, there will be no current.

3. If it is an exchange, the water continues to flow in and out of the bucket, resulting in an intersecting coarse flow circuit. DC needs to discharge the charge in the capacitor before it can be charged. If a switch is added to continuously form a charge-discharge circuit, continuous charging and discharging can also generate current.

In electronic circuits, capacitors are used to block direct current through alternating current, and are also used to store and release electrical charges to act as filters to smooth out pulsating signals.

The capacitor is charged using direct current, and the discharge is also direct.

The capacitance on a single-phase motor is the principle that the capacitor can pass through the alternating current but changes the phase angle.

The capacitors of general household appliances are charged using AC and direct current. Let's talk about the capacitor in the motor, it plays a role in voltage regulation.

The capacitor is charged using direct current (or it may be direct current), and the discharged electricity is of course direct current.

Generally speaking, we all think that capacitors are DC charged, and discharge is also DC.

However, the principle of the capacitor being energized in the AC circuit is also based on the principle of charge and discharge.

Therefore, this charge and discharge must be analyzed from the basic principle, and the specific problem should be analyzed in detail.

The capacitance is not broken down.

The reason why you feel the contradiction is because you think that the current must have a flow of charge, and the flow of charge must be continuous, so you think that the charge passes through the insulator in the middle of the plate, and this contradicts the insulator not conducting.

To explain this problem, you need to know about electromagnetic fields.

The idea that electric current is the flow of electric charge is actually not entirely true. Maxwell noticed this contradiction you mentioned and put forward the hypothesis of displacement current, which is that the current can be either the flow of electric charges or the changing electric field to form the current. For more information about displacement currents, you can refer to the electromagnetic field textbook or online materials.

Let me briefly describe the principle of the formation of displacement currents.

We know that the two plates of a capacitor have a positive and negative charge respectively, and an electric field will be formed between the positive and negative charges, and if the amount of positive and negative charges changes, obviously the electric field between the plates will also change. According to Maxwell's theory of electromagnetic fields, a changing electric field produces a magnetic field, and a changing magnetic field produces an electric field, which is the formation of electromagnetic waves. We know that a wire flowing through it creates a magnetic field around the wire, and a capacitor also generates a magnetic field when the charge changes, which means that there is also an electric current flowing through the capacitor, which Maxwell called a displacement current.

The displacement current is combined with what we usually call an electric current (the flow of an electric charge, which in an electromagnetic field is called a conduction current) and is called a total current.

From the point of view of full current, the current is continuous, and there is no contradiction as you are talking about.

The working principle of the capacitor is filtering, when the current in the circuit is a peak-to-valley waveform, the capacitor will continue to charge and discharge, if it is a steady-state DC current, the capacitor is not working.

Because the positive and negative poles of a DC power supply are relatively stable, and the alternating current can pass through the capacitor for conduction, it is ideal to charge the capacitor from DC.

Because the two poles of the capacitor are like a container, they can store the charge, it is like water and a bucket, water is electricity, when the electric potential is unbalanced, it is the water level is unbalanced, and it has to fill the bucket. An electric current is generated, and when it is filled, there is no current.

In the case of AC, the water is constantly flowing in and out of the bucket, creating an AC loop.

DC is not good, only after the charge in the capacitor is discharged, it can be charged. If a switch is added to continuously form a charge-discharge circuit, continuous charging and discharging will also generate current.

Generally, capacitors are constructed with two metal plates insulated from each other, and there is insulation between the plates, and when we measure the capacitor with the ohm level of the multimeter, the digital meter will ring. It turns out that measuring the capacitance with a multimeter is equivalent to connecting the capacitor with the battery and the ammeter in series, and then the electrons of the negative pole of the battery quickly run to one of the plates of the capacitor, making it negatively charged, and the electrons on the other plate are attracted by the positive electrode of the battery, so they lose the positive charge of the electrons. As a result of this movement of electrons, there is an electric current flowing in the wire, so the multimeter rings.

This current is called the charging current, but the flow of this current is short-lived, and when the voltage formed by the charge charged at the poles of the capacitor is equal to the voltage of the battery, the charging is completed and the current in the wire stops. So the numerical watch stopped as soon as it rang. If you reverse connect the above-mentioned charged capacitor to the ohmic file of the multimeter, you will still hear a sound, but this time it will ring for a little longer, why?

Because this process includes two processes: capacitor discharge and reverse charging.

Whether it is charging or discharging, the current only flows in the wire outside the capacitor, and does not flow directly through the capacitor itself, so for direct current, the capacitor is not conductive, which is the "DC" effect of the capacitor.

What about when the AC signal is added to both ends of the capacitor? Because the direction of alternating current is constantly changing, the capacitor is constantly charging, discharging, charging, discharging, ...... discharging, electrons flow back and forth in the wire, and these electrons flow through the bulb to make the bulb glow, and flow through the horn to make the horn make a sound......, as if the alternating current passes through the capacitor, this is the "coupling" effect of the capacitor, that is, the "communication".

The simplest plate capacitor is charged by applying the principle that positive and negative charges attract each other, and the charged charges are stored on the positive and negative plates. In reality, capacitors have different principles for storing charges, and it is difficult to explain the details for a while. It should be said that whether it is a DC capacitor or an AC capacitor, as long as it can be charged and stored, it is an electrostatic charge, which can also be understood as "direct current".

The difference is that when the AC capacitor is connected to the AC power, the charge in the capacitor and the AC power supply are constantly exchanged, and this exchange can produce many of the functions that we need for the AC circuit. When the AC capacitor is powered off instantaneously, the last charge stored in the capacitor is still the so-called electrostatic charge, and the "direct current" it releases is also "direct current".

The description of the electrical parameters makes it possible to better understand it. AC and DC are two special forms. Or rather, the two most common and simplest forms.

Capacitors charge and discharge, neither AC nor simple stable DC.

The construction of a capacitor consists of two metal conductors that are close together and insulated from each other.

When the two metal conductors of the capacitor are connected to the positive and negative poles of the power supply respectively, the positive pole of the power supply has excess positive charges, and the negative poles have excess negative charges, they are all going to move directionally, so that the two poles of the capacitor have positive and negative charges, and the positive and negative charges on the two plates can attract each other, so the charge of the positive and negative poles of the power supply will continue to move directionally towards the capacitor until an electric field is established between the two plates of the capacitor, so that the potential difference of the diode plate is equal to the power supply voltage, and the positive and negative charges of the power supply stop moving directionally. Capacitor charging ends.

This is the charging process of a capacitor. Once the charging is complete, there is no longer a directional movement of the charge in the circuit.

In other words, when the circuit is stable, no current passes through the capacitor. This is where the capacitor can block the direct current. As long as the circuit is unstable and the power supply voltage changes, there will be charging and discharging phenomena in the capacitor, so that there is current in the circuit.

This is a state of instability. This is the case in AC circuits.

Obviously, there is no directional movement of charge between the capacitors in this process, but only the directional movement of charges in the circuit.

Please adopt it in time. If you have any questions, ask them separately. I will always help you. Best wishes.

In fact, I have had such a problem before, and after listening to the teacher's explanation, I have a little bit of enlightenment For this problem, maybe you have not understood the concept of electric potential, you must know that even if the wires are all closed, there is no voltage, and there can be no current, because the two plates of the capacitor are metal, he can produce the potential difference that is the voltage due to the different charged properties of the two plates, so you must know that the fully charged capacitor is equivalent to the power supply, but he is not closed, this is because he can generate voltage. When charging the capacitor with direct current, the electrons of the negative pole of the power supply move to the A plate of the capacitor, and the different charges attract each other according to the same charge, so the B plate will have a positive charge, and the negative charge on the B board will move to the positive pole of the power supply (you should know it), but this process is only completed in an instant, so the current can be detected by the ammeter at this moment, and there will be no current flow after the capacitor is full, because the voltage of the capacitor and the voltage of the power supply are equal, It should be like this, I don't know if you understand,