Information is transmitted through alternating current, how is alternating current transmitted

1. Not using alternating current.

The waveform is to transmit information, which is additionally modulated and transmitted carriers, so that power lines.

is filled with information to be decoded; It could be data, it could be voice;

2. There is a corresponding device at the receiving point that can receive the carrier, decode or demodulate, and take out useful information (voice or data);

3. There have been personal productions and company products, but the sales are not good, and the climate is not good. The reasons and reasons are roughly as follows:

1) The transmission capacity is poor, the signal loss is serious, theoretically the data can be received within a transformer range, but the actual line is a little longer, secondly, the carrier frequency is not high, the higher the frequency, the stronger the transmission data ability, but the closer the transmission distance.

2) Large power consumption;

3) The capacity of the switch is small, and it cannot accommodate too many ** machines, of course, the stand-alone communication can be dealt with;

4) There is a certain interference with electrical appliances;

5) Today, when switching electrical appliances are popular, this communication mode is prone to interference, data transmission is prone to errors, and the voice communication effect is not very good;

So. Speechless, I hope that there will be cattle people to continue to improve this thing, after all, it doesn't cost ** and don't have to pull ** line, right?

There has long been a power carrier communication system, which can talk within the range of the same transformer, but it has no practical meaning, and now the walkie-talkie is so cheap and convenient.

Electric current is the flow of charges, not electrons. An electron is a physical particle that may orbit an atom or be in a free state; Whereas, charge is an abstract concept that refers to charged particles, which may be particles that have lost electrons, positively charged, or particles that have gained electrons, which are negatively charged.

People generally use voltage to measure the magnitude of the electric potential, and the unit is volts. The voltage is also known as the potential difference, which is similar to the height difference. There are also positive and negative potential differences, with the high being positive relative to the low and the vice versa. For example, the positive electrode of a dry battery is + relative to the negative electrode, and the negative electrode is relative to the positive electrode.

So what's going on with alternating current? Again, we have to start with the alternator. We know that the basic principle of electromagnetic generators is to use mechanical energy to rotate the coil between the poles of the magnetic field; When the coil turns, the coil cuts the magnetic inductance line, pushing the charge to move to produce a voltage.

Since the motion of the coil is periodic, passing through the magnetic field in two different directions (for one side of the coil) in one cycle, the direction of movement of the charge is completely opposite, so the voltage it produces is in a sinusoidal waveform. In order to maximize the power generation efficiency, three coils are generally installed in the generator, and the three coils are distributed at an angle of 120 degrees. Note that the red, green, and yellow wires in the above diagram are three coils, the cyan one in the middle is the iron rotor, and the copper one in the front is the winding resistance, which is used to generate the magnetic field.

The specific principle of generator operation is more complex and is not within the scope of this article, so I will not go into details.

Since each coil has two ends, the charge moves back and forth between these ends as the generator operates, resulting in the aforementioned sinusoidal waveform voltage. If the bulb is connected at both ends, a current loop is formed. Regardless of the direction of the current in the circuit, when it passes through the tungsten wire (resistor), it will produce heat, and the light will come on.

Electric furnaces and electric gases are all based on this principle.

The principle of the electric motor is the opposite of that of the generator, which uses the sine wave current to generate a magnetic field that constantly changes direction and pushes the core rotor to rotate. The situation of electronic appliances is more complicated, generally through the DC power supply to convert the alternating current into direct current and then to the electronic devices. This process of direct conversion is more complicated, interested students can refer to this post:

Sharp-eyed to teach you to understand the internal materials of the power supply (original)].

In order to save the cost of the generator and the transmission wire, one end of the three coils in the generator will be connected together, generally a Y-shaped connection, and this end is called a neutral wire. In the generator structure diagram above, you can see that one end of the three coils is connected to the blue neutral wire, and the other end of the three coils becomes the three outputs of the generator.

The potential energy of a charge is called the electric potential, which is the tendency of a charge to move from one place to another, as Faraday tells us that when a conductor cuts a magnetic inductance line, it creates a flowing charge on the conductor.

According to the law of conservation of energy, the total power is the same from the time the power plant is generated to the time it is delivered to the end user, if the loss during the transmission process is not counted. The electricity generated by the power plant becomes hundreds of thousands of volts of high-voltage alternating current (the current is very small) through the transformer, according to the characteristics of electricity, the voltage is large and the current is small, and the loss in the transmission process is small, and it is relatively safe. In modern applications, DC motors are generally used for very small power motors, such as children's toys and e-bikes, and AC is generally used for high-power motors, such as machine tool motors.

The propagation of light in the atmosphere is severely depleted (consumed). In addition, if it is a high-power electrical energy or other energy that is converted into light energy, it is likely to be a "laser", so which device can withstand laser irradiation for a long time? At least, humans are not yet in a position to invent such a device (and it is not excluded that such a device may be invented in the future).

To achieve a "lossless" (or "low-consumption") transfer of energy in the form of light energy, a "vacuum" environment may be required. Because, in the non-vacuum state, gas molecules and tiny suspended particles can greatly lose light energy (the simplest example is "haze anti-laser", which actually makes sense). In short, it is not possible to use light to transmit electricity at present, and of course, it is not excluded that this idea will be realized in the future.

If you dare to imagine, you will be recognized. Every progress in human science and technology comes from every small but bold idea.

Capacity, power, voltage, transmission distance, ......These are all factors to consider!

When electricity and light energy are converted into each other, energy loss has already occurred, and part of the energy is dissipated as heat. In this way, it is not possible to transmit electrical energy without consumption.

I'll tell you why it's not feasible to transmit electrical energy with light at the moment, 1There is heat loss in the process of converting electrical energy into light energy. 2.

The conversion of light energy into electrical energy is extremely inefficient, and the best can only achieve 30% at present. 3.There is a loss of light propagating through the air.

4.It is also the most important point that light can only travel in a straight line, and if you change the direction of propagation with a plane mirror, it will cause loss and trouble. In summary, it is not feasible to transmit electrical energy with light at present.