What happens when the energy stored by capacitors and inductors is returned to the power supply?

The electricity consumption of the family is usually with a certain perceptual reactive power, how to understand reactive power? To give a disgusting example, if you drink milk tea, take a sip, spit it back half a mouthful, and spit it back is reactive. Of course, this is not very appropriate.

Those that need to be excited in the household load, such as fluorescent lamp ballasts, hair dryer motors, etc., belong to the load of drinking and spitting half a mouthful.

The current flowing through the line will cause loss, so take a sip and spit out half a sip and drink half a sip directly, although you drink the same amount, but the former has a large loss. But it can't be helped, they just have this temper.

What does it mean to add a capacitor, which is equivalent to an extra load, and it is characterized by half a sip and half a spit, but the rhythm is exactly the opposite of those ballasts and motors.

To take another more disgusting example, you share a straw with another person to drink milk tea, he drinks half a mouthful and spits half a mouthful, you drink half a mouthful, and it happens to be when he vomits and you spit out, that is, half of the mouthful you drink comes from his mouth, and this half of the mouthful does not run back and forth from the straw, but directly from his mouth to your mouth. The current running on the line is smaller, and the loss is smaller. <>

There is no reactive power in the DC circuit.

There is a problem with the power exchange between the inductors and capacitors and the power supply in AC circuits.

The power exchange between the inductor and capacitor and the power supply takes place four times during a power frequency cycle: twice the inductor (capacitor) absorbs energy from the power supply, and twice the inductor (capacitor) returns energy to the power supply. Therefore, the average power in one power frequency cycle is equal to zero.

The characteristics of the power exchange are:

When the voltage and current are in the same direction (both positive or negative values of voltage and current), the inductor or capacitor absorbs energy from the power supply; When the voltage is reversed to the current (one positive and one negative), the inductor and capacitor are sent back to the power supply.

It can be seen that reactive power is the energy exchange between the inductance or capacitor existing in the power equipment itself and the power supply. Although there is no energy consumption in the reactive power itself, because the reactive current flows in the grid, the resistance of the line will bring active losses. Through the improvement of the circuit of the power equipment, the inductance of the power equipment can be reduced, so that the reactive power can be reduced.

The DC steady-state capacitance phase is in the circuit and the electric phase is in the short circuit.

The voltage at both ends of the capacitor UC=R*U (Rleft+Rright)=15x30 30=15 Current il=U (R+R+Rright)=30 30=1A, then the capacitor stores energy wc=

Electrostored energy wl= j

The answer is easy to solve, please adopt the satisfactory answer, thank you.

I really can't change it or look for the information of this model on the hard city.

A capacitor stores energy through an electric field, and an inductor stores energy through a magnetic field.

In the steady state of DC, the capacitance is equivalent to an open circuit, and the inductance is equivalent to a short circuit.

The voltage at both ends of the capacitor UC=R*U (Rleft+Rright)=15x30 30=15V

The current flowing through the inductor il=U (Rleft+Rright)=30 30=1A, then the energy stored by the capacitor is wc=

The energy stored by the inductor is wl= j

It is not easy to answer the question, if you solve it, please adopt it as a satisfactory answer in time, thank you!

If the voltage at both ends of an inductive element is zero, its energy storage is not necessarily equal to zero.

If the current in a capacitor element is zero, its energy storage is not necessarily equal to zero.

Example 1: When an inductive element is placed on a separate table, and the voltage at both ends of it is zero, its energy storage is equal to 0.

When a capacitive element is placed alone on the round table pure oak, the energy storage through it is 0 (uncharged) or greater than 0 (the capacitor is fully charged).

Example 2: An inductive element and a capacitor form a parallel resonant circuit, and during the electromagnetic oscillation process of the circuit, the inductor coil orange pants are orange.

When the voltage at both ends is 0, the current passing through it is the largest, and the energy storage of the inductor is the largest (corresponding to the capacitor discharged); When the current passing through the capacitor is 0, the energy storage of the capacitor is the largest (charging is completed, corresponding to the inductance without magnetic field energy).