What exactly does VA mean and how is it different from W?

p is power.

W is doing work.

Generally speaking, the input power is equal to the rated power, and the electrical appliance can work normally, depending on the power and the power factor.

1.Apparent power.

In electrotechnical technology, the product of the voltage and the effective value of the current at the end of the single-port network, that is, or apparent power, is recorded as , that is, obviously, only when the single-port network is completely mixed by resistors, the apparent power is equal to the average power, otherwise, the apparent power is always greater than the average power (i.e., active power), that is, the apparent power is not the power actually consumed by the single-port network.

To illustrate the difference, the apparent power is not measured in watts (w), but in volt-ampere (v·a).

Because it is the phase difference angle between the voltage and the current at the end of the single-port network, it is often called the power factor angle.

For networks without independent sources, and when the impedance is inductive, when the impedance is capacitive. In both cases, the power factor . It can be seen that the value of only from does not reflect the nature of the circuit, so the words "lag" or "ahead" are often added at the same time.

"Hysteresis" refers to the current hysteresis voltage, i.e., the situation of , and "leading" refers to the current leading voltage, i.e., the situation.

3.The meaning of apparent power.

Since the apparent power is equal to the product of the rms values of current and voltage at the end of the network, and the rms values can objectively reflect the magnitude of the sinusoidal quantity and its functional force, the product of these two quantities reflects the energy that the external circuit needs to transfer to the network or the capacity of the network in order to ensure the normal operation of the network.

Because there are not only energy-dissipating elements such as resistors, but also energy-storing elements such as inductors and capacitors, the external circuit must provide the power required for its normal operation, that is, average power or active power, and a part of the energy should be stored in inductors, capacitors and other components. This is the reason why the apparent power is greater than the average power. Only then can the network or device work properly.

If the network is supplied with power according to the average power, it cannot guarantee its normal operation.

Therefore, in practice, it is usually used to design and use electrical equipment with rated voltage and rated current, and its capacity is marked by apparent power.

In addition, since the energy stored in one period of inductors, capacitors, and other components will be released in other periods of time, this part of the energy may be absorbed by the resistor or supplied to the external circuit. So, we see that the instantaneous power of a single-port network is sometimes positive and sometimes negative.

VA, or voltammetry, is a physical quantity that describes apparent power.

VA stands for apparent power, i.e., active power and reactive power, which is usually used to refer to the capacity of a transformer. In addition to active power, electrical equipment usually consumes reactive power, where reactive power is ineffective but is also provided by the grid.

In addition to active power, electrical equipment usually consumes reactive power, where reactive power is ineffective but is also provided by the grid. The sum of the two is called apparent power.

Very annoying or very annoying because the very English letter v annoyance is a

VA is the unit of apparent power of an electrical appliance. The apparent power is equal to the product of the RMS voltage and the RMS current. It is multiplied by the power factor to equal the active power.

The units are voltammetry and kilovolt-ampere. If a single-phase transformer is designed with a rated voltage of 220 volts and a current of 10 amperes, the value is 2200 volt amperes. It is equivalent to the maximum active power that can be obtained at a given voltage and current.

Note. The power calculation of the AC pure resistance circuit is as follows: the power consumed by the resistance is positive at any instant, that is, it draws electrical energy from the power supply at any moment, and the instantaneous average value during a period of time is called the average power, also known as the active power, which is represented by p in W, and it is equal to the product of the RMS value of the voltage and the RMS of the current, that is:

p=ui=i^2×r=u^2/r。

<> va refers to the Paizen as voltammere, which is a unit of electrical measurement equal to the product of one volt and one amperere, which is used as a measure of power in direct current and as a measure of expressive power in alternating current. Its value is the product of voltage and current, and watts are the unit of "active power".

In a DC circuit or a purely resistive AC load, the values are equal. In AC circuits, the two are generally not equal, W (watts) = VA (volt-ampere) COS, COS is the power factor, except for pure resistance load, slag COS is generally less than 1. Due to the existence of inductive load and sexual load, the current dust has a leading and hysteresis relationship with respect to the voltage.