Understanding VA Power for Electronics - Explained by Experts

Question

Hello!!

Maybe someone explain to me because I don't know

What is this specific VA power, for example: 50 VA. Is it the same as RMS or not, how is it 1 RMS = .... VA..I have a vermonke regent and it says it has 100 va and I don't know how much it is; I am waiting for your reply

elektryk · Accepted Answer

Not in the past, but only VA, which means the unit of power of the geometric sum of reactive and active power, which is actually instantaneous power. RMS is a completely different concept (it concerns the measurement method, not only power), it means the root mean square in the case of power it is about effective power.

lelekx · Accepted Answer

VA is not a WATT at all.
With alternating current, there are concepts of active, reactive and apparent power. Active power is expressed in Watts, reactive power in Varia, apparent power in VA.

Apparent power expressed in VA is calculated on the basis of the product of RMS current and voltage flowing through the circuit. Active power is the product of apparent power by the cosine of the phase difference between the current and voltage. Reactive power is the product of apparent power by the sine of the above-mentioned displacement.

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adambyw · Accepted Answer

Only for direct current, Wat = VA

P = I * U * cos?
if cos? = 0 (for direct current) Watt = VA, for variable only with a resistive load this condition is met, but most often the load is inductive, less often capacitive and cos i is different from zero because there is a shift between the current and voltage by the angle ?.

You will have a little less than 100 watts. Approximately 90-95W, there is no count as there is no other data. (cosine of phi)
This unit is most often used in the power supply system and if it gets that much from the network, divide it by a half and by the number of channels.

robokop · Accepted Answer

Electrician, are you sure you know what you are writing about? The unit of power is Watt (W) , i.e. the product of current and voltage - I * U = P , that is, V * A = W, in simplified terms, a unit W / A is a unit of apparent power, used in relation to devices that theoretically do not consume this power, but carry it (transformers, loudspeakers, etc.).

ciasteczkowypotwor · Accepted Answer

No, you only have one channel of this Vermona, originally it has 2 channels of 100VA. Why is it getting 380W from the network? Because these amplifiers had low efficiency and they gave the remaining 180W as heat. As for buying a second module and capacitors, it will be hard, you will sooner buy a ready-made tip and add it to have two channels. As for the power consumption by ADSs, it is on average 120% of the output power.

miszkoo · Accepted Answer

Oh, I see that some of the basics of electronics avoided a wide berth and they still argue VA is a unit of apparent power, it is denoted as non-cubic S

S = P + jQ

P is the active power expressed in Watts
Q reactive power expressed in vars
j denotes the imaginary part which is the root of z -1

adambyw · Accepted Answer

You would be 95W

esiuabek · Answer

Volt times Ampere or WATT. there used to be such a designation of consumption or power output.

jamesvangrey · Answer

So VA power is the peak power?

jamesvangrey · Answer

If I have 100 VA, then how much will it be converted into watts? if it can be compared

elektryk · Answer

It all depends on the receiver, for a 100VA bulb it will be 100W, for an electric motor less.

jamesvangrey · Answer

Amplifier vermona regent 2023 hmm and this?

jamesvangrey · Answer

This monster consumes 380 watts from the network ..... And there, on the outputs, it writes 100 VaA and ... I don't know how much power it has, because I don't know such a term

adambyw · Answer

You can assume that W is slightly less (always less than or equal to, never greater) than VA. It is often assumed that W = VA for the sake of simplicity, hence the conclusion that it is some obsolete unit ...

jamesvangrey · Answer

So I have 100 watts RMS on the channel?
I am curious how many networks download ADS terminals, maybe someone knows? And maybe someone else would help me in this vermona, there is not one amplifier module and 2 large condensers by chance. Does anyone know if you can buy such a system and these kondy?

andk1eltd · Answer

I guess for cos = 1?

adambyw · Answer

Ration cos = 1 for an angle of 0 degrees. I was wrong

jamesvangrey · Answer

But on this vermona it says that I have 100 va on one channel. So I would have the 100 watts?

andk1eltd · Answer

Yes. But only if you connect non-inductive resistors instead of speakers

jamesvangrey · Answer

But I only mean the speakers. Would I have 100 watts or not. How not, how much?

dj arq · Answer

In my humble opinion, apparent power is given for a simple reason - BIGGER DIGIT

Just like the musical power, the RMS conversion in the speakers to AES and the famous PMPO (remember: divide the power by 80). If you have more numbers, you are more like a cowboy - that's a secret. 100VA looks better than, for example, 80W

jamesvangrey · Answer

Thank you for all your comments!

Understanding VA Power for Electronics - Explained by Experts

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