Why Are Homes Wired With AC Instead of DC? Differences Between Direct and Alternating Current

What is the difference between direct and alternating current? Why is it not possible to have an installation in the house based on direct current, please answer.

Thank you in advance.

Your friend probably deigns to joke?

I'm not kidding, I'm a layman after all. ;] I have a general concept, but it just makes me wonder, so please provide sensible answers, after all, household receivers can also be DC, it is about a power loss?

Total laziness. Start with this link: http://pl.wikipedia.org/wiki/Napi%C4%99cie_sta%C5%82e Everything should be clarified.
And by the way, write in Polish.

I read that ... and about the alternating current too.

In practice, supplying resistive loads with alternating current does not differ significantly from supplying with direct current. This is due to the fact that, regardless of the type of supply current, the same amount of energy is emitted at the resistive load for currents of the same effective value. This phenomenon is commonly used in all kinds of heating elements (e.g. electric kettles, stove heaters, stoves, soldering irons, etc.


As you can see, there are no significant differences, just like incandescent lamps can be operated with alternating current, which causes flickering unnoticeable by the human eye, and direct current that would not cause this, so what is my error? Please reply, thanks!

At the bottom you also have a link to alternating current.

If you can, give me an answer, I have read about everyone's currents, I think. So I'm waiting for some answer.

It is written like a bull:

Quote:

As mentioned above, alternating current can be easily transformed into other current or voltage levels

Converting AC to DC is very simple, the other way around, it gets more complicated. The main point is that alternating current is easy to send from the power plant to the consumer because it can be transformed, while direct current cannot be transformed.

Thank you very much especially for patience and that is what I wanted to answer

I will only add because it was not written why it is convenient to transform the voltage to a higher one to transmit it.
Well, when we take electricity, we take some power.
To make it easier on active power: P = U * I .
If the voltage on the forward lines had not been higher, the current I, which we are consuming, would actually flow on the line. Well, there are a lot of people consuming energy, so a huge current would flow through this transmission cable (the cable would have to be very thick). Well, and if we transform the voltage to a much higher one, according to equation P = U * And if we increase U, a smaller I flows (with the same power consumption). Thus, the currents on the transmission line decrease, and hence the power losses on the P line cable = I?R also falling (which is just what we want). Only at the apartment, the voltage is transformed to ~ 230V.

From what I was taught. There are very large losses when transmitting direct current over long distances. At alternating current, the voltage of which can be increased to large values and then reduced, the losses are much smaller. Although maybe direct current is slightly safer. The relatively safe value for alternating current for humans is 30 mA, and for direct current is 70 mA.

https://www.youtube.com/watch?v=5h0Fc9aiiW0

adasikp wrote:

From what I was taught. There are very large losses when transmitting direct current over long distances

Then you were badly taught.

lukasgld wrote:

At alternating current, the voltage of which can be increased to large values and then reduced, the losses are much smaller.

And the permanent cannot be increased / lowered? Conversely, the losses are much greater.

Moderated By trymer01:

Regulations, point 3.1.11. Don't post messages that add nothing to the discussion. They are misleading, dangerous or do not solve the user's problem.
Please drop this confrontational tone.

lukasgld wrote:

Although maybe direct current is slightly safer.

Not minimally, but enormously.

lukasgld wrote:

The relatively safe value for alternating current for humans is 30 mA, and for direct current is 70 mA.

But for this 30mA current to flow it is enough, for example, several dozen V AC, with

You are probably right. I was educated badly, not long ago in an electro-energy course. I have read a bit and indeed HVDC transmission lines are actually being built at the moment. Maybe back in the days of Edison and Tesla, alternating current won, because long-distance transmission was cheaper and simpler in construction, but now, as far as I know, new lines are being built to transmit direct current over long distances. I will not delve into the topic, maybe one day for myself, but you are probably right. I finished school a while ago. That is, over 10 years ago. Electronics technician. I am also an electrician up to 30V.

Until quite recently, it was much easier to transform alternating current - and probably the scale of actions that would have to be performed to change the entire system is too large to be carried out during this time. And probably it would have to be done in stages - first, introduce into common use equipment that could be powered by direct and alternating current. Then wait until almost all the equipment that requires AC power is used up, and then change installations.

I don't know if direct current would win with the current level of technology. Certainly many devices could be more efficient with DC power, although motors are not necessarily. There is a question of reliability - will the DC power system be as reliable as it is now? New types of failures, hitherto unknown, may appear. This means that you would have to make a small-scale system and test it for many years before introducing large-scale DC.

That's all right too, that's why we'll probably also stay when transmitting energy with alternating current. As far as I know. He writes on the internet that direct current is mainly used to transmit energy underwater, across the seas, etc.

Direct current transmission is most advantageous in submarine transmission, where the high electrical capacity of such a cable and the associated losses for alternating current are at stake. Until recently, the technology of this transmission practically did not exist, but at present (high-voltage IGBTs, diodes, etc.) it has become real and is used more and more often.

kacpo1 wrote:

But for this 30mA current to flow it is enough, for example, several dozen V AC, with

Krzysztof Kamienski wrote:

At last I found out that I was a resistive "nonlinear", like in a Lem novel. Mr. Ohm, go back to school!

My point here is that alternating current penetrates better (at lower voltage) deep into the body, where, as you know, there is less resistance. Also, with the same DC and AC voltages, different amperages will flow through the body. Ohm still on top

lukasgld wrote:

DC is mainly used to transmit energy underwater, through the seas, etc.

Yes, because the cables there are closest to ground, so there are very large losses (in the case of alternating current) due to parasitic capacitance.

kacpo1 wrote:

My point here is that alternating current penetrates better (at lower voltage) deep into the body, where, as you know, there is less resistance. Also, with the same DC and AC voltages, different amperages will flow through the body. Ohm still on top

Heresies and smalted dubs. And it is such that it is a pity to straighten and correct them.

Pina wrote:

What is the difference between direct and alternating current? Why is it not possible to have an installation in the house based on direct current, please answer.

Thank you in advance.

You are asking for alternating current and alternating current has little to do with alternating current.
Alternating current changes its amplitude with respect to time, i.e. the voltage can jump from zero to a higher value, but it does not change direction, it does not cross zero.

Right. You have alternating current in an outlet or in alternating current power grids. The alternating current is not necessarily alternating, it may be triangular, square or irregular, varying in amplitude, and may not pass through zero. There is some formula for the rms value of alternating current. I forgot already, but he's going to find him. Tension. Because the maximum voltage in the AC waveform is higher, and the effective value, or whatever you call it, is 230 V in the + socket - probably 10%.

2006 theme!