Ask the capacitance, what is the inductance time constant respectively 10

The time constant affects how quickly the voltage on the capacitor or the current in the inductor is established. The greater the time constant, the slower the voltage rises or the current rises. It is not difficult to understand that in the case of capacitance, for example, the time constant is the product of capacitance and resistance, i.e., rc.

The larger the resistance, the larger the RC product, the smaller the charging current of the capacitor and the slower the voltage rise at the same voltage.

The time constant only affects the rate at which the capacitor voltage rises, but not the rise curve.

The basic formula of capacitance inductance: inductance: U=LDI DT; Capacitance: i=cdv dt

Capacitive reactance is expressed by xc, capacitance is expressed by c(f), and frequency is expressed by f(hz), then the unit of capacitive reactance of xc=1 2 fc is ohm. Knowing the frequency f and capacitance c of alternating current, we can use the above formula to calculate the capacitive reactance.

The inductive reactance is denoted by xl, the inductance is denoted by l(h), and the frequency is denoted by f(hz), then the unit of inductive reactance of xl=2 fl is ohm. Knowing the frequency f of the alternating current and the inductance l of the coil, the inductive reactance can be calculated using the above formula.

Knowing the capacitive and inductive reactances, the corresponding voltage and current can be calculated using Ohm's law, and if the capacitance is used with resistance and inductance, the phase relationship should be considered.

Capacitance:

Called "capacitance", it refers to the amount of free charge stored at a given potential difference, denoted as c, and the SI unit is farad (f). Generally speaking, the charge will move under force in the electric field, and when there is a medium between the conductors, it hinders the movement of the charge and makes the charge accumulate on the conductor, resulting in the accumulation and storage of charge, and the amount of stored charge is called capacitance.

Capacitance refers to the ability to hold an electric charge. Any electrostatic field is made up of many capacitors, and where there is an electrostatic field, there is a capacitance, and the capacitance is described in terms of an electrostatic field. It is generally believed that

An isolated conductor forms a capacitance with infinity, and the conductor is grounded to the infinity and connected to the earth as a whole.

The above content reference: Encyclopedia - Capacitors.

<> in general, the relationship between the time-varying voltage v(t) and the time-varying current i(t) on an inductive element with an inductance of l can be expressed by a differential equation: vt=l(dit dt).

The parameter that characterizes the ability of an inductive element (abbreviated as inductor) to generate magnetic flux and store magnetic fields, also called inductance, is denoted by L, which is numerically equal to the flux generated per unit of current. Inductive components refer to inductors (inductance coils) and various transformers.

"Inductive Element" is a basic component of the circuit model in the "Circuit Analysis" discipline, except for the resistive element R and the capacitive element C. **In sexual circuits, inductive elements are expressed as inductance L. The "volt-ampere relation" of components is a necessary constraint in linear circuit analysis in addition to Kirchhoff's law.

The time constant is the product of resistance and capacitance in seconds, and the time constant will be different depending on the capacitor.

If during charging, the transition process has changed by 63 percent of the total variable of the elapsed time t. The larger the time constant, the slower the charging speed and the longer the transition process, which is the physical meaning of the time constant.

A capacitor, a device that holds an electric charge, is one of the electronic components used in electronic devices, any two conductors that are insulated from each other and are very close to each other, including between the wires, constitute an electric grip tape container. It is widely used in circuits such as straight and straight through communication, coupling, bypass, filtering, tuning loop, energy conversion, control, etc. The ability of a capacitor to hold a charge is capacitance, which is denoted by the letter C.

Characterize the physical quantity of the circuit that responds to changes in the transient old code process. It has a time dimension. The smaller the time constant of the circuit, the faster its response changes, and vice versa.

In resistive and capacitive circuits, it is the product of resistance and capacitance cr, if the unit of c is microfara, the single delay of r is megaohm, and the unit of time constant t is seconds. In such a circuit, when a constant current i flows, the time constant is the time it takes for the terminal voltage of the capacitor to reach about times the maximum, and when the circuit is disconnected, the time constant is the time required for the terminal voltage of the capacitor to reach about times the maximum.

According to the diagram indicated, if you are asking for uc1(t), then c in the time constant is the capacitance of c1. The same is true for others. The r in the time constant sometimes needs to be found by the short-circuit method (short-circuit the capacitor, find the short-circuit current noise, and then pass through the terminal voltage when the circuit is broken, which can be found according to r=u i.

Another method is the external power supply method (remove the capacitor and replace a power supply, which can be a voltage source or a current source, and find the current, generally with a hypothetical power supply voltage, which can be approximated.)

There is only one time constant for the same circuit, and the time constant of the RC first-order circuit = time constant = rl. where r is the equivalent resistance of the Thevenin equivalent circuit when viewed from both ends of the circuit energy storage element.

Find the time constant: =rc, =l r. (The time constant is denoted by ).

1. The time constant refers to the time required for the terminal voltage of the capacitor to reach the maximum value of 1 E, that is, about a multiple. 2. In the circuit of resistance and capacitance, it is the product of resistance and capacitance. 3. The time constant of the RLC transient circuit is that in the RC circuit, the capacitance voltage UC is always monotonically attenuated to zero by the initial value UC (0) according to the exponential law, and its time constant = RC.

Expansion:

In addition to the application of time constants in circuits, they are also used in motors, heat transfer, and radioactive logging instruments.

1. The mechanical time constant of the motor.

The mechanical time constant of the motor refers to the time required for the motor to reach 63% of the rated speed under no-load conditions given the rated voltage. This parameter mainly measures the starting characteristics of the motor, such as the motor of the coreless, which is generally about 1-50ms.

2. Time constants of heat transfer.

The time constant of a thermocouple is the time it takes for the excess temperature of an object to drop to the initial excess temperature when analyzed using the lumped parameter method. When the temperature of the fluid is measured by a thermocouple, the time-buried constant of the thermocouple is a silver index that explains how fast the thermocouple responds to the temperature change of the convective bending body.

3. Time constants in radioactive logging instruments.

The time constant of the count rate meter in a radioactive logging instrument is determined by the product of resistance and capacitance in the integration loop, and its value is selected according to the count rate, logging speed and the required measurement accuracy. If the counting rate is low, a large time constant is required to ensure the necessary accuracy; However, the time constant is large, the instrument is inert, and the logging speed is reduced accordingly.